subject:(Large deformation)

Penn State University

1. Chen, Wei. Numerical Studies of Seismically Induced Slope Deformation Using Smoothed Particle Hydrodynamics Method.

Degree: 2012, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/16010

► There has been growing interest in improving current procedures for estimating seismically-induced deformations of natural and man-made slopes due to recently frequent earthquake events and… (more)

▼ There has been growing interest in improving current procedures for estimating seismically-induced deformations of natural and man-made slopes due to recently frequent earthquake events and the resulted damaged to infrastructure systems. The aim of this study is to develop a numerical model to effectively and reliably assess seismically-induced slope deformations that typically involve large deformations and complex soil constitutive behaviors. A numerical model based on the meshfree Smoothed Particle Hydrodynamics (SPH) method has been developed by implementing various advanced constitutive models into the SPH formulations. The developed model is validated by two readily available and well-documented experiments: axisymmetric collapses of granular columns and model slope tests on a shaking table. For the former, the non-dilatant Drucker-Prager (D-P) constitutive relationship with perfect plasticity is used. The developed model precisely reproduces the experimentally-observed three regimes of flow patterns based on the initial aspect ratio of the granular column. In addition to the flow patterns, the simulated final deposit height and run-out distance along with the non-deformed region after the collapse of granular columns are in excellent agreement with experimental data in the literature. For the latter, a constitutive model that combines the strain-softening viscoplasticity and Modified Kondner and Zelasko (MKZ) rule is implemented and utilized to account for the effects of wave propagation in the sliding mass, cyclic nonlinear behavior of soil, and progressive reduction in shear strength during sliding, which are not explicitly considered in various Newmark-type analyses widely used in the current research and practice in geotechnical earthquake engineering. The initiation of slope failure and subsequent progressive development of the sliding surface are successfully captured by the developed SPH model. A localized shear band along the failure surface and a bulge near the toe of the model slope are observed in the simulations, showing a good agreement with the experimental observations. The simulated failure mode, displacement time histories, and acceleration response spectra at several monitor locations along the model slope also agree well with the experimental recordings. Based on the validated SPH model, a parametric study is followed to investigate the effects of spatial parameters including both particle spacing and smooth length on the accuracy of SPH simulations. The parametric study also investigates the effects of material strength and shear modulus along with boundary conditions on the seismically-induced slope deformations, providing insights into the mechanisms of earthquake-induced slope deformations. It is thus suggested that the proposed SPH model is an effective tool for assessing the seismic performance of soil slopes. It may be also used to advance the computational capability of modeling geotechnical engineering phenomena involving large deformations. Advisors/Committee Members: Tong Qiu, Dissertation Advisor/Co-Advisor, Tong Qiu, Committee Chair/Co-Chair, Daniel G Linzell, Committee Member, Prasenjit Basu, Committee Member, Shelley Marie Stoffels, Committee Member, Derek Elsworth, Committee Member.

Subjects/Keywords: Smoothed Particle Hydrodynamics Method; Large Deformation; Dynam

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APA (6^th Edition):

Chen, W. (2012). Numerical Studies of Seismically Induced Slope Deformation Using Smoothed Particle Hydrodynamics Method. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16010

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Wei. “Numerical Studies of Seismically Induced Slope Deformation Using Smoothed Particle Hydrodynamics Method.” 2012. Thesis, Penn State University. Accessed January 15, 2021. https://submit-etda.libraries.psu.edu/catalog/16010.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Wei. “Numerical Studies of Seismically Induced Slope Deformation Using Smoothed Particle Hydrodynamics Method.” 2012. Web. 15 Jan 2021.

Vancouver:

Chen W. Numerical Studies of Seismically Induced Slope Deformation Using Smoothed Particle Hydrodynamics Method. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Jan 15]. Available from: https://submit-etda.libraries.psu.edu/catalog/16010.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen W. Numerical Studies of Seismically Induced Slope Deformation Using Smoothed Particle Hydrodynamics Method. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/16010

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Newcastle

2. Kardani, Mina. Large deformation analysis in geomechanics using adaptive finite element methods.

Degree: PhD, 2012, University of Newcastle

URL: http://hdl.handle.net/1959.13/928191

►

Research Doctorate - Doctor of Philosophy (PhD)

The finite element method (FEM) is extensively used in analysis of a wide range of nonlinear geotechnical problems.… (more)

▼

Research Doctorate - Doctor of Philosophy (PhD)

The finite element method (FEM) is extensively used in analysis of a wide range of nonlinear geotechnical problems. The finite element method can handle simple and complex constitutive soil models, and solve problems with complicated geometries and boundary conditions with reasonably accurate results. On the other hand, mesh distortion and entanglement of elements, occurring inevitably in failure zones with high stress/strain concentration, are main drawbacks of the common finite element solutions such as the Updated Lagrangian method. In addition, efficacious application of the method requires experience and a certain amount of trial and error, particularly when choosing an optimal time and spatial discretisation. Adaptive finite element methods provide a means for obtaining more reliable solutions by continuously adjusting the discretisation in time and space according to the current solution. These procedures automatically refine, coarsen, or relocate a mesh to achieve a solution with a specified accuracy in an optimal fashion. Although a significant amount of research has been devoted to adaptive finite element analysis in solid mechanics, the application of adaptive methods has been less considered in nonlinear geotechnical problems due to the complexity. Modelling of problems in geomechanics is typically sophisticated due to nonlinear constitutive laws, large deformations, changing boundary conditions and time-dependent behaviour. A variety of adaptive finite element techniques have been developed to tackle nonlinear problems in solid mechanics. However, the application of these methods to geomechanics is still a challenge. Amongst the various adaptive techniques, the r-adaptive and h-adaptive finite element methods are probably the most favoured and most established. r-adaptive finite element method attempts to eliminate the mesh distortion by refining the mesh in the finite element domain. On the other hand, h-adaptive finite element method is based on the idea of generating a new mesh by dividing the area of original elements where the interpolation should be improved to achieve higher accuracy or to avoid mesh distortion. In this Thesis, the h-adaptive finite element technique will be employed to solve some complex geotechnical problems involving material nonlinearity, large deformation, changing boundary conditions and time-dependent nonlinearity. To achieve this, the main features of the technique including advanced mesh generation algorithms, error estimation methods and a procedure for remapping of state variables will be discussed and developed in company of a robust analysis program. The performance of the h-adaptive finite element method is then represented by considering the accuracy and efficiency of the method in solving some classical geomechanics problems such as the bearing capacity of footings, expansion of cavities, and the stability of slopes. In addition, this Thesis will address the performance and the efficiency of alternative error…

Advisors/Committee Members: University of Newcastle. Faculty of Engineering and Built Environment, School of Engineering.

Subjects/Keywords: adaptivity; h-adaptive; large deformation; finite element

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APA (6^th Edition):

Kardani, M. (2012). Large deformation analysis in geomechanics using adaptive finite element methods. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/928191

Chicago Manual of Style (16^th Edition):

Kardani, Mina. “Large deformation analysis in geomechanics using adaptive finite element methods.” 2012. Doctoral Dissertation, University of Newcastle. Accessed January 15, 2021. http://hdl.handle.net/1959.13/928191.

MLA Handbook (7^th Edition):

Kardani, Mina. “Large deformation analysis in geomechanics using adaptive finite element methods.” 2012. Web. 15 Jan 2021.

Vancouver:

Kardani M. Large deformation analysis in geomechanics using adaptive finite element methods. [Internet] [Doctoral dissertation]. University of Newcastle; 2012. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1959.13/928191.

Council of Science Editors:

Kardani M. Large deformation analysis in geomechanics using adaptive finite element methods. [Doctoral Dissertation]. University of Newcastle; 2012. Available from: http://hdl.handle.net/1959.13/928191

University of New South Wales

3. Khoshghalb, Arman. Meshfree analysis of unsaturated porous media including hydraulic hysteresis and large deformations.

Degree: Civil & Environmental Engineering, 2011, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/51667 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10334/SOURCE02?view=true

► An efficient and robust computational algorithm, based on the meshfree method, is developed for fully coupled large deformation analysis of variably saturated geo-materials. The contributions… (more)

▼ An efficient and robust computational algorithm, based on the meshfree method, is developed for fully coupled large deformation analysis of variably saturated geo-materials. The contributions made in the thesis include: i) a new three-point time discretisation scheme with variable time step for numerical solution of parabolic partial differential equations. The proposed method has the advantage that it dampens spurious oscillations of the numerical results, while maintaining the second order accuracy and remaining unconditional stability; ii) a fully coupled meshfree model, based on the radial point interpolation method (RPIM), for flow-deformation analysis of saturated porous media. A vast majority of current meshfree methods for coupled analysis of saturated porous media are based on the moving least square (MLS) approximation for constructing shape functions, which render imposition of the essential boundary condition difficult. In addition, some suffer from inconsistent discretisation of governing equations leading to physically inadmissible results; iii) a meshfree model for multi phase analysis of unsaturated soils including hydraulic hysteresis. In particular, an incremental model is proposed in this work for the evolution of water retention properties of the soil with deformation; iv) finally, a new formulation for large deformation analysis of saturated porous media. The formulation is based on the Jaumann stress rate and transformation of all the state variables to the configuration at last time step. In the proposed method, the nodal shape function derivatives are only calculated once in each time step leading to less computational cost of the algorithm when a meshfree method is used. Furthermore, nonlinear stiffness matrices (due to effects of large deformations) obtained are independent of the stresses in the medium leading to more stable numerical results. Application of the approaches proposed is demonstrated using an exhaustive array of numerical results including saturated and unsaturated soils. Excellent agreements are obtained between the numerical results and baseline data reported in the literature in all the cases considered.

Subjects/Keywords: Large Deformation; Meshfree methods; Unsaturated porous media

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APA (6^th Edition):

Khoshghalb, A. (2011). Meshfree analysis of unsaturated porous media including hydraulic hysteresis and large deformations. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/51667 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10334/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Khoshghalb, Arman. “Meshfree analysis of unsaturated porous media including hydraulic hysteresis and large deformations.” 2011. Doctoral Dissertation, University of New South Wales. Accessed January 15, 2021. http://handle.unsw.edu.au/1959.4/51667 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10334/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Khoshghalb, Arman. “Meshfree analysis of unsaturated porous media including hydraulic hysteresis and large deformations.” 2011. Web. 15 Jan 2021.

Vancouver:

Khoshghalb A. Meshfree analysis of unsaturated porous media including hydraulic hysteresis and large deformations. [Internet] [Doctoral dissertation]. University of New South Wales; 2011. [cited 2021 Jan 15]. Available from: http://handle.unsw.edu.au/1959.4/51667 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10334/SOURCE02?view=true.

Council of Science Editors:

Khoshghalb A. Meshfree analysis of unsaturated porous media including hydraulic hysteresis and large deformations. [Doctoral Dissertation]. University of New South Wales; 2011. Available from: http://handle.unsw.edu.au/1959.4/51667 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10334/SOURCE02?view=true

Iowa State University

4. Kamrani, Mehdi. Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations.

Degree: 2020, Iowa State University

URL: https://lib.dr.iastate.edu/etd/17925

► Large plastic deformation of materials result in the ultrafine-grained materials with highly improved properties, like a combination of high ductility and high strength. The high-pressure-torsion… (more)

Subjects/Keywords: diamond anvil cell; high pressure; large deformation; large strain; phase transformation

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APA (6^th Edition):

Kamrani, M. (2020). Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/17925

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kamrani, Mehdi. “Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations.” 2020. Thesis, Iowa State University. Accessed January 15, 2021. https://lib.dr.iastate.edu/etd/17925.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kamrani, Mehdi. “Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations.” 2020. Web. 15 Jan 2021.

Vancouver:

Kamrani M. Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations. [Internet] [Thesis]. Iowa State University; 2020. [cited 2021 Jan 15]. Available from: https://lib.dr.iastate.edu/etd/17925.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kamrani M. Interaction between large deformation plasticity and strain-induced phase transformation at high pressures and large deformations. [Thesis]. Iowa State University; 2020. Available from: https://lib.dr.iastate.edu/etd/17925

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cornell University

5. Liu, Mincong. EXPERIMENTAL STUDIES OF THE MECHANICAL BEHAVIOR OF A PVA DUAL-CROSSLINK HYDROGEL.

Degree: PhD, Mechanical Engineering, 2019, Cornell University

URL: http://hdl.handle.net/1813/67667

► This study aims to understand the mechanical behavior of a PVA dual-crosslink hydrogel using both experimental and theoretical tools, with more focus on the experimental… (more)

▼ This study aims to understand the mechanical behavior of a PVA dual-crosslink hydrogel using both experimental and theoretical tools, with more focus on the experimental aspects. This PVA hydrogel is crosslinked by both chemical (permanent) and physical (transient) crosslinks. The chemical crosslinks remain attached during loading while the physical crosslinks can break and reform, leading to the viscoelasticity. This material serves as a model system for understanding the behavior of such materials. Firstly, we studied the effects of temperature and loading rates on the mechanical response of this material. The breaking and reforming rates of the physical crosslinks are sensitive to the temperature change. Both large strain uniaxial tension tests and small strain torsional rheometry tests were performed at different rates in a temperature range of 13 to 50 Celsius. The rheometry data show that time-temperature superposition can be used to condense the data to a master curve. It is found that by allowing the model parameters to be temperature dependent, a previously developed constitutive model fits the tension and rheometry data well. Horizontal (time) and vertical (amplitude) shift factors calculated directly from the rheometry test data and from tension test data agree well with each other, establishing the connection between the effects of temperature on different types of experiments. Secondly, we developed a 2D digital image correlation (DIC) system to measure the deformation near the crack tip of a cracked specimen. Experimental details such as how to prepare a durable speckle pattern on a material that is 90% water are discussed. DIC is used to measure the strain field in tension loaded samples containing a central hole, a circular edge notch and a sharp crack. These experiments are modeled using the finite element method (FEM). Excellent agreement between FEM and DIC results for all three geometries suggests that the DIC measurements are accurate up to strains of over 10, even in the presence of very high strain gradients near a crack tip. The method is then applied to verify a theoretical prediction that the deformation field in a cracked sample under relaxation loading, i.e. constant applied boundary displacement, is stationary in time even as the stress relaxes by a factor of three. We further utilized DIC to study the crack propagation of this PVA gel. We show that the crack propagates in steady state. The moving crack induces a very high strain rate ahead of the moving crack tip, which leads to high stress that causes the fracture of the material. Thirdly, we developed a predictive fracture criterion for this material. We loaded the specimen with an edge crack to fracture under two loading conditions: constant applied stress (creep) and constant stretch rate. The stress fields near the crack tip were simulated using finite element method (FEM) and a stress-intensity-factor-like crack tip parameter was obtained. Using this parameter in a kinetic fracture model in which the rate of bond breaking… Advisors/Committee Members: Zehnder, Alan Taylor (chair), Hui, Chung-Yuen (committee member), Warner, Derek H. (committee member).

Subjects/Keywords: Fracture; Mechanical engineering; Mechanics; digital image correlation; large deformation; viscoelastic; hydrogel

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APA (6^th Edition):

Liu, M. (2019). EXPERIMENTAL STUDIES OF THE MECHANICAL BEHAVIOR OF A PVA DUAL-CROSSLINK HYDROGEL. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/67667

Chicago Manual of Style (16^th Edition):

Liu, Mincong. “EXPERIMENTAL STUDIES OF THE MECHANICAL BEHAVIOR OF A PVA DUAL-CROSSLINK HYDROGEL.” 2019. Doctoral Dissertation, Cornell University. Accessed January 15, 2021. http://hdl.handle.net/1813/67667.

MLA Handbook (7^th Edition):

Liu, Mincong. “EXPERIMENTAL STUDIES OF THE MECHANICAL BEHAVIOR OF A PVA DUAL-CROSSLINK HYDROGEL.” 2019. Web. 15 Jan 2021.

Vancouver:

Liu M. EXPERIMENTAL STUDIES OF THE MECHANICAL BEHAVIOR OF A PVA DUAL-CROSSLINK HYDROGEL. [Internet] [Doctoral dissertation]. Cornell University; 2019. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1813/67667.

Council of Science Editors:

Liu M. EXPERIMENTAL STUDIES OF THE MECHANICAL BEHAVIOR OF A PVA DUAL-CROSSLINK HYDROGEL. [Doctoral Dissertation]. Cornell University; 2019. Available from: http://hdl.handle.net/1813/67667

University of Melbourne

6. Robinson, Dale. Mechanical properties of normal and osteoarthritic human articular cartilage.

Degree: 2015, University of Melbourne

URL: http://hdl.handle.net/11343/91512

► Articular cartilage is a thin layer of soft tissue that lines the ends of bones in diarthrodial joints and is essential for normal joint function… (more)

▼ Articular cartilage is a thin layer of soft tissue that lines the ends of bones in diarthrodial joints and is essential for normal joint function during physiological activity. Degenerate changes to the cartilage caused by osteoarthritis limits the ability of cartilage to fulfil its functions, and this often has a negative impact on an individual's quality of life. The mechanisms driving the onset and progression of osteoarthritis are not well understood. Since cartilage is associated with joint loading, improved knowledge of the mechanical properties of normal and osteoarthritic cartilage may offer greater insight into osteoarthritis and more effective treatment methods. The focus of this dissertation was to improve understanding of the mechanical properties of normal and osteoarthritic human cartilage. This was achieved by two inter-related studies that employed experimental and computational techniques to determine the anisotropic and hyperelastic properties of cartilage under fast loading. The aims of the first study were to (1) measure the anisotropic properties at the articular surface of normal and osteoarthritic cartilage for fast loading rates; (2) measure the structural parameters (zonal thicknesses and proteoglycan thickness) of articular cartilage and assess the severity of cartilage damage indicative of osteoarthritis; and (3) determine whether the structural parameters and/or severity of cartilage damage correlate with the anisotropic properties at the surface. Small osteochondral specimens retrieved from healthy and osteoarthritic human knees were tested in unconfined compression at fast loading rates and large strains representative of weight-bearing activity. Anisotropy at the surface was quantified by direction-dependent Poisson's ratios measured using imaging techniques. Structural parameters were measured using histological techniques while the severity of cartilage damage was quantified using the Osteoarthritis Research Society International (OARSI) grading scale. For all specimens tested, anisotropy was observed at the articular surface, a behaviour that has not been previously observed for high loading rates. The measured Poisson's ratios were elevated in specimens with a greater amount of tissue damage, suggesting that anisotropy across the entire articular surface of the knee may be altered as a result of significant tissue damage. The specific aims of the second study were to (1) measure the material constants of normal and osteoarthritic human knee cartilage using isotropic hyperelastic models; (2) determine whether the material constants correlate with histological measures of structure and/or cartilage tissue damage; and (3) quantify the abilities of two common isotropic hyperelastic material models, the neo-Hookean and Yeoh models, to describe articular cartilage contact force, area, pressure. Specimen-specific finite element models were used to describe the unconfined compression experiments in the first study. The material constants were determined iteratively to minimise the…

Subjects/Keywords: hyperelastic; neo-Hookean; Yeoh; incompressible; large deformation; radial strain; anisotropic

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APA (6^th Edition):

Robinson, D. (2015). Mechanical properties of normal and osteoarthritic human articular cartilage. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/91512

Chicago Manual of Style (16^th Edition):

Robinson, Dale. “Mechanical properties of normal and osteoarthritic human articular cartilage.” 2015. Doctoral Dissertation, University of Melbourne. Accessed January 15, 2021. http://hdl.handle.net/11343/91512.

MLA Handbook (7^th Edition):

Robinson, Dale. “Mechanical properties of normal and osteoarthritic human articular cartilage.” 2015. Web. 15 Jan 2021.

Vancouver:

Robinson D. Mechanical properties of normal and osteoarthritic human articular cartilage. [Internet] [Doctoral dissertation]. University of Melbourne; 2015. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/11343/91512.

Council of Science Editors:

Robinson D. Mechanical properties of normal and osteoarthritic human articular cartilage. [Doctoral Dissertation]. University of Melbourne; 2015. Available from: http://hdl.handle.net/11343/91512

University of New South Wales

7. Mohammadi, Samaneh. Large deformation analysis of slopes and embankments.

Degree: Civil & Environmental Engineering, 2013, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/52746 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11419/SOURCE01?view=true

► A robust and efficient numerical tool has been developed to evaluate the behaviour of slopes and embankments during failure and to determine the associated post-failure… (more)

▼ A robust and efficient numerical tool has been developed to evaluate the behaviour of slopes and embankments during failure and to determine the associated post-failure deformations. The large deformations accompanying failure in slopes can be captured by employing the 'Updated Lagrangian' formulation in a large deformation finite element analysis based on the Jaumann stress rate. Realistic behaviours of slopes during failure can be simulated if slope movements and changes in geometry are considered in the simulation. To enable the simulation of any possible progressive failure in slopes, an extended Mohr-Coulomb constitutive model, representing the strain softening behaviour of the slope material, is implemented in the program. Application of a strain softening model in finite element analysis is often accompanied by localisation of shear strains and lack of convergence. A remedy to these problems has been introduced and successfully implemented in the analysis of slopes. High gradient of strains and large deformations also result in distortions of finite element mesh and accumulation of errors in the solution. A proper numerical discretisation is required to reduce errors in the solution. 'h-adaptive' remeshing technique is employed to refine the finite element mesh around the area of large shear strains, thereby improving the accuracy and convergence of numerical solutions. This involves extensive programming in the area of mesh generation based on the 'Advancing Front Technique'. In addition, a proper error estimator needs to be defined in accordance with the problem of slope failure and pertinent variables should be mapped during remeshing. This study has provided a numerical tool that can be used to identify slopes with potential catastrophic failure and to investigate different factors affecting initiation of progressive failure. The validity of the proposed method and the efficiency of the numerical tool are demonstrated through simulation of a number of case studies on a range of slope failure problems, such as settlement of a highway embankment, failure of a test embankment during construction, and failure of a slope due to toe excavations. The predicted deformations are compared with the field measurements and reasonable agreements are obtained in all cases considered in this thesis. Advisors/Committee Members: Taiebat, Hossein, Civil & Environmental Engineering, Faculty of Engineering, UNSW, Khalili , Nasser, Civil & Environmental Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: H-adaptive; Slope stability; Large deformation; Strain-softening; Progressive failure

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APA (6^th Edition):

Mohammadi, S. (2013). Large deformation analysis of slopes and embankments. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/52746 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11419/SOURCE01?view=true

Chicago Manual of Style (16^th Edition):

Mohammadi, Samaneh. “Large deformation analysis of slopes and embankments.” 2013. Doctoral Dissertation, University of New South Wales. Accessed January 15, 2021. http://handle.unsw.edu.au/1959.4/52746 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11419/SOURCE01?view=true.

MLA Handbook (7^th Edition):

Mohammadi, Samaneh. “Large deformation analysis of slopes and embankments.” 2013. Web. 15 Jan 2021.

Vancouver:

Mohammadi S. Large deformation analysis of slopes and embankments. [Internet] [Doctoral dissertation]. University of New South Wales; 2013. [cited 2021 Jan 15]. Available from: http://handle.unsw.edu.au/1959.4/52746 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11419/SOURCE01?view=true.

Council of Science Editors:

Mohammadi S. Large deformation analysis of slopes and embankments. [Doctoral Dissertation]. University of New South Wales; 2013. Available from: http://handle.unsw.edu.au/1959.4/52746 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:11419/SOURCE01?view=true

The Ohio State University

8. Luo, Ke. On the Application of CISAMR for Modeling Hyperelastic Materials Undergoing Finite Deformation.

Degree: MS, Mechanical Engineering, 2018, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1525442256935631

► Finite strain problems undergoing large deformations typically require mesh updates to maintain acceptable elements quality. Remeshing on the whole domain is an updating method suitable… (more)

Subjects/Keywords: Mechanical Engineering; Mechanics; CISAMR; Large Deformation; Remeshing; Adaptive refinement; Complex Microstructure

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APA (6^th Edition):

Luo, K. (2018). On the Application of CISAMR for Modeling Hyperelastic Materials Undergoing Finite Deformation. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1525442256935631

Chicago Manual of Style (16^th Edition):

Luo, Ke. “On the Application of CISAMR for Modeling Hyperelastic Materials Undergoing Finite Deformation.” 2018. Masters Thesis, The Ohio State University. Accessed January 15, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525442256935631.

MLA Handbook (7^th Edition):

Luo, Ke. “On the Application of CISAMR for Modeling Hyperelastic Materials Undergoing Finite Deformation.” 2018. Web. 15 Jan 2021.

Vancouver:

Luo K. On the Application of CISAMR for Modeling Hyperelastic Materials Undergoing Finite Deformation. [Internet] [Masters thesis]. The Ohio State University; 2018. [cited 2021 Jan 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1525442256935631.

Council of Science Editors:

Luo K. On the Application of CISAMR for Modeling Hyperelastic Materials Undergoing Finite Deformation. [Masters Thesis]. The Ohio State University; 2018. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1525442256935631

9. Ferranto, Justin S. Material and Geometric Analysis of Structures Subjected to Large Deformation.

Degree: 2016, University of Nevada – Reno

URL: http://hdl.handle.net/11714/2285

► The two major focuses of this dissertation are: (1) Studying the structural behaviors of hyper-elastic membranes subjected to extremely large deformation. These membranes are used… (more)

▼ The two major focuses of this dissertation are: (1) Studying the structural behaviors of hyper-elastic membranes subjected to extremely large deformation. These membranes are used in a reconfigurable tooling system (RTS) which was under development during the course of this study. (2) Establishing a continuum constitutive model for fabric materials under in-plane large deformation through theoretical and numerical analyses. This model may also be applied to study a class of materials which involve significant internal structure reconfiguration during deformation.The RTS allows quick onsite fabrication of high temperature composite parts. RTS applications include rapid onsite repair of aircraft components. The RTS uses a hyperelastic membrane as an interface between the state-change material and model. This membrane may be subjected to 800% engineering strain during operation. In this part of the study, material properties of the membranes have been characterized through three tests: simple tension, equal biaxial tension and planar tension. Nine-term Money-Rivlin constants are obtained through data regression. Finite element simulations have been conducted to simulate the deformed shapes of a membrane around several representative geometries under various vacuum pressure and constraint conditions. Experimental results have been compared with predictions from finite element simulations. This study contributes to understanding the behavior of membrane structures under large deformations in general; the results are used to generate design guidelines for RTS applicability.Fabric materials are widely used in industry for numerous applications. They exhibit a meso-scale complexity and involve significant internal structure reconfiguration during large deformation, which prohibits the direct application of the theory of continuum mechanics when studying these materials. In the second part of this work, a unique meso-scale FEA model, utilizing new modeling techniques and boundary conditions, is developed. This model can be used to simulate the weaving/loom process, and to predict the mechanical behaviors of a representative unit of fabric subjected to multi-axial large deformations. This model has also been used to examine the mechanism of fabric internal structure reconfiguration during deformation under various load paths. An energy based continuum model for plain weave fabric is developed, where a sinusoidal shape function is used to describe the yarn waviness before and after deformation. Castigliano's theorem is applied to determine the interactions between yarns. The model presented has been validated with the FEA model, and compared with third party experiments. Favorable agreements have been found. This model has the potential for developing a general constitutive relationship for a broad class of materials which involve significant internal structure reconfiguration during deformation Advisors/Committee Members: Shan, Wanliang (advisor), Luo, Shen-Yi (advisor), Gibson, Ronald (committee member), Liao, Yiliang (committee member), Upadhyay, Arun (committee member), Shan, Wanliang (committee member), Luo, Shen-Yi (committee member).

Subjects/Keywords: Fabric; Hyperelasticity; Large Deformation; Mooney-Rivlin; Plain Weave; Textile

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APA (6^th Edition):

Ferranto, J. S. (2016). Material and Geometric Analysis of Structures Subjected to Large Deformation. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/2285

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ferranto, Justin S. “Material and Geometric Analysis of Structures Subjected to Large Deformation.” 2016. Thesis, University of Nevada – Reno. Accessed January 15, 2021. http://hdl.handle.net/11714/2285.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ferranto, Justin S. “Material and Geometric Analysis of Structures Subjected to Large Deformation.” 2016. Web. 15 Jan 2021.

Vancouver:

Ferranto JS. Material and Geometric Analysis of Structures Subjected to Large Deformation. [Internet] [Thesis]. University of Nevada – Reno; 2016. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/11714/2285.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ferranto JS. Material and Geometric Analysis of Structures Subjected to Large Deformation. [Thesis]. University of Nevada – Reno; 2016. Available from: http://hdl.handle.net/11714/2285

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

10. Sharma, Madhu. Effect of hydrocolloid type on rheological and sensory properties of pureed carrots.

Degree: MS, Department of Food Science, 2015, University of Guelph

URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8758

► Hydrocolloids are added to pureed foods to give desired consistency based on visual judgement, due to the existing qualitative guidelines. The current study was undertaken… (more)

Subjects/Keywords: Hydrocolloid; Rheology; Sensory; Dysphagia; Napping; Pureed Foods; TPA; Texture Profile Analysis; Correlation; Small Deformation; Large Deformation; Appearance; Flavour; Texture; Viscosity

11 more images…

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APA (6^th Edition):

Sharma, M. (2015). Effect of hydrocolloid type on rheological and sensory properties of pureed carrots. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8758

Chicago Manual of Style (16^th Edition):

Sharma, Madhu. “Effect of hydrocolloid type on rheological and sensory properties of pureed carrots.” 2015. Masters Thesis, University of Guelph. Accessed January 15, 2021. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8758.

MLA Handbook (7^th Edition):

Sharma, Madhu. “Effect of hydrocolloid type on rheological and sensory properties of pureed carrots.” 2015. Web. 15 Jan 2021.

Vancouver:

Sharma M. Effect of hydrocolloid type on rheological and sensory properties of pureed carrots. [Internet] [Masters thesis]. University of Guelph; 2015. [cited 2021 Jan 15]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8758.

Council of Science Editors:

Sharma M. Effect of hydrocolloid type on rheological and sensory properties of pureed carrots. [Masters Thesis]. University of Guelph; 2015. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/8758

University of South Carolina

11. Guo, Siming. Applications of Advanced Imaging Methods: Macro-Scale Studies of Woven Composites and Micro-Scale Measurements on Heated IC Packages.

Degree: PhD, Mechanical Engineering, 2014, University of South Carolina

URL: https://scholarcommons.sc.edu/etd/3003

► As a representative advanced imaging technique, the digital image correlation (DIC) method has been well established and widely used for deformation measurements in experimental… (more)

▼ As a representative advanced imaging technique, the digital image correlation (DIC) method has been well established and widely used for deformation measurements in experimental mechanics. This methodology, both 2D and 3D, provides qualitative and quantitative information regarding the specimen’s non-uniform deformation response. Its full-field capabilities and non-contacting approach are especially advantageous when applied to heterogeneous material systems such as fiber-reinforced composites and integrated chip (IC) packages. To increase understanding of damage evolution in advanced composite material systems, a series of large deflection bending-compression experiments and model predictions have been performed for a woven glass-epoxy composite material system. Stereo digital image correlation has been integrated with a compression-bending mechanical loading system to simultaneously quantify full-field deformations along the length of the specimen. Specifically, the integrated system is employed to experimentally study the highly non-uniform full-field strain fields on both compression and tension surfaces of the heterogeneous specimen undergoing compression-bending loading. Theoretical developments employing both small and large deformation models are performed. Results show (a) that the Euler–Bernoulli beam theory for small deformations is adequate to describe the shape and deformations when the axial and transverse displacement are quite small, (b) that a modified Drucker’s equation effectively extends the theoretical predictions to the large deformation region, providing an accurate estimate for the buckling load, the post-buckling axial load-axial displacement response of the specimen and the axial strain along the beam centerline, even in the presence of observed anticlastic (double) specimen curvature near mid-length for all fiber angles (that is not modeled), (c) for the first time show that the quantities σeff - εeff are linearly related on both the compression and tension surfaces of a beam-compression specimen in the range 0 ≤ εeff < 0.005 as the specimen undergoes combined bending-compression loading. In addition, computational studies also show the consistency with the experimental σeff - εeff results on both surfaces. In a separate set of studies, SEM-based imaging at high magnification is used with 2D-DIC to measure thermal deformations at the nano-scale on cross-sections of IC package to improve understanding of the highly heterogeneous nature of the deformations in IC chips. Full-field thermal deformation experiments on different materials within an IC chip cross-section have been successfully obtained for areas from 50x50 μm2 to 10x10 μm2 and at temperatures from RT to ≈ 200 °C using images obtained with a Zeiss Ultraplus Thermal Field Emission SEM. Initially, polishing methods for heterogeneous electronic packages containing silicon, Cu bump, WPR layer, substrate and FLI (First level interconnect) were evaluated with the goal of achieving sub-micron surface flatness. Studies have shown that… Advisors/Committee Members: Michael Sutton.

Subjects/Keywords: Engineering; Mechanical Engineering; Bending Compression; Digital Image Correlation; heterogeneous material; Large Deformation; thermal deformation; WOVEN COMPOSITE

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Guo, S. (2014). Applications of Advanced Imaging Methods: Macro-Scale Studies of Woven Composites and Micro-Scale Measurements on Heated IC Packages. (Doctoral Dissertation). University of South Carolina. Retrieved from https://scholarcommons.sc.edu/etd/3003

Chicago Manual of Style (16^th Edition):

Guo, Siming. “Applications of Advanced Imaging Methods: Macro-Scale Studies of Woven Composites and Micro-Scale Measurements on Heated IC Packages.” 2014. Doctoral Dissertation, University of South Carolina. Accessed January 15, 2021. https://scholarcommons.sc.edu/etd/3003.

MLA Handbook (7^th Edition):

Guo, Siming. “Applications of Advanced Imaging Methods: Macro-Scale Studies of Woven Composites and Micro-Scale Measurements on Heated IC Packages.” 2014. Web. 15 Jan 2021.

Vancouver:

Guo S. Applications of Advanced Imaging Methods: Macro-Scale Studies of Woven Composites and Micro-Scale Measurements on Heated IC Packages. [Internet] [Doctoral dissertation]. University of South Carolina; 2014. [cited 2021 Jan 15]. Available from: https://scholarcommons.sc.edu/etd/3003.

Council of Science Editors:

Guo S. Applications of Advanced Imaging Methods: Macro-Scale Studies of Woven Composites and Micro-Scale Measurements on Heated IC Packages. [Doctoral Dissertation]. University of South Carolina; 2014. Available from: https://scholarcommons.sc.edu/etd/3003

University of Alberta

12. Sohail, Touqeer. Modeling the mechanics of soft particles using nonlinear membrane theory.

Degree: PhD, Department of Mechanical Engineering, 2013, University of Alberta

URL: https://era.library.ualberta.ca/files/wh246s32r

► Recently there has been great research interest in small soft particles because of their significance in both biology and industry. The term ‘particle’ here is… (more)

▼ Recently there has been great research interest in small soft particles because of their significance in both biology and industry. The term ‘particle’ here is defined as a deformable object with size in the range of nano- to micrometers. Many experimental efforts have been spent on investigating the behavior of these particles and theoretical models have been proposed to describe the mechanics of these particles under different loading conditions. Due to the complex nature of these particles, these mechanics models are all accompanied by various assumptions, one of the common simplifications being the neglect of large deformation. The objective of this study was to use nonlinear continuum based membrane theory in describing the mechanical behavior of soft particles under several loading conditions relevant to practice. In all cases studied, the particle was assumed to be spherical in the unstressed state and filled with incompressible fluid. The surface of the particle was considered to be homogenous, isotropic, of hyperelastic material and can sustain large nonlinear deformation. The particle was subjected to four different loading conditions: (1) symmetric poking by two identical conical indenters; (2) asymmetric poking by a conical indenter and a flat indenter; (3) micropipette aspiration; and (4) electrostatic attraction to a charged substrate. Under each condition, the deformation of the particle, its stress state and formation of contact were determined. Possible coupling between external loading and deformation was addressed. The theoretical results were compared with experimental results involving the mechanical response of soft particles such as cells. The model developed in this dissertation is capable of characterizing certain phenomena observed in experiments. The proposed model investigates the large deformation in soft particles from a continuum perspective. The model will be useful in understanding the mechanical properties of particles such as cells, vesicle and microcapsules that have an immense importance in life and industrial applications.

Subjects/Keywords: adhesion; electrostatic interaction; contact mechanics; large deformation; continuum model; incompressible fluid; nonlinear membrane

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APA (6^th Edition):

Sohail, T. (2013). Modeling the mechanics of soft particles using nonlinear membrane theory. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/wh246s32r

Chicago Manual of Style (16^th Edition):

Sohail, Touqeer. “Modeling the mechanics of soft particles using nonlinear membrane theory.” 2013. Doctoral Dissertation, University of Alberta. Accessed January 15, 2021. https://era.library.ualberta.ca/files/wh246s32r.

MLA Handbook (7^th Edition):

Sohail, Touqeer. “Modeling the mechanics of soft particles using nonlinear membrane theory.” 2013. Web. 15 Jan 2021.

Vancouver:

Sohail T. Modeling the mechanics of soft particles using nonlinear membrane theory. [Internet] [Doctoral dissertation]. University of Alberta; 2013. [cited 2021 Jan 15]. Available from: https://era.library.ualberta.ca/files/wh246s32r.

Council of Science Editors:

Sohail T. Modeling the mechanics of soft particles using nonlinear membrane theory. [Doctoral Dissertation]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/wh246s32r

13. 和田, 雅之. Model Order Reductionを用いたリアルタイム大変形シミュレーション(要旨).

Degree: 修士(環境学), 2017, The University of Tokyo / 東京大学

URL: http://hdl.handle.net/2261/52336

► Recently the demand of real-time physics base simulation has been rising in the CG animation area. It is popular to use spring-damper model or Finite… (more)

Subjects/Keywords: Model Order Reduction; リアルタイム; 大変形; FEM; Real-time; Finite Element Method; Large deformation

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APA (6^th Edition):

和田, �. (2017). Model Order Reductionを用いたリアルタイム大変形シミュレーション(要旨). (Thesis). The University of Tokyo / 東京大学. Retrieved from http://hdl.handle.net/2261/52336

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

和田, 雅之. “Model Order Reductionを用いたリアルタイム大変形シミュレーション(要旨).” 2017. Thesis, The University of Tokyo / 東京大学. Accessed January 15, 2021. http://hdl.handle.net/2261/52336.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

和田, 雅之. “Model Order Reductionを用いたリアルタイム大変形シミュレーション(要旨).” 2017. Web. 15 Jan 2021.

Vancouver:

和田 �. Model Order Reductionを用いたリアルタイム大変形シミュレーション(要旨). [Internet] [Thesis]. The University of Tokyo / 東京大学; 2017. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2261/52336.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

和田 �. Model Order Reductionを用いたリアルタイム大変形シミュレーション(要旨). [Thesis]. The University of Tokyo / 東京大学; 2017. Available from: http://hdl.handle.net/2261/52336

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Newcastle

14. Khishvand, Mohammad. Application of the third medium contact method in geomechanics.

Degree: PhD, 2018, University of Newcastle

URL: http://hdl.handle.net/1959.13/1383627

►

Research Doctorate - Doctor of Philosophy (PhD)

The finite element method plays an important role in solving a wide range of geotechnical problems, particularly those… (more)

▼

Research Doctorate - Doctor of Philosophy (PhD)

The finite element method plays an important role in solving a wide range of geotechnical problems, particularly those involving the interaction between structural elements and geomaterials. These are often referred to as soil-structure interaction problems. Closed-form solutions based on the theories of elasticity and plasticity have been developed for structural foundations, layered soil systems, earth-retaining structures and tunnels. On the other hand, numerical algorithms in contact mechanics and computational geomechanics have been developed during the past few decades, facilitating solutions to many geotechnical problems. However, traditional approaches in contact mechanics require complicated search algorithms to detect nodes at the interface between the contacting bodies. More recently, a new contact scheme, the third medium contact method, based on a space filling mesh, has been developed in solid mechanics. This approach embeds the contacting bodies in a medium, whose properties are chosen to satisfy the contact constraints. The objective of this study is the further development and application of the recently developed computational contact algorithm for the analysis of geotechnical problems involving finite deformation and changing boundary conditions. The procedure involves new finite element (FE) algorithms that were formulated and implemented into SNAC-a bespoke finite element code developed by the geomechanics group at the University of Newcastle, Australia. The ability and accuracy of this method in predicting displacements, as well as the contact forces, is validated by solving selected numerical examples. The potential merits of this method for analysing geotechnical problems by the finite element method are also addressed and discussed. The analysis of the deformation of a solid soil phase coupled with the pressure of a pore fluid phase is a sophisticated problem in geomechanics. This problem becomes even more complex when the boundary conditions and boundary surfaces change during the analysis. In this study, the recently developed third medium contact method is further extended for analysing contact problems in geotechnical engineering in which the material behaviour is nonlinear, the soil may be subjected to large deformations, and the soil medium includes a solid phase as well as a liquid phase. By providing numerical solutions it is demonstrated that this method can overcome the drawbacks of the conventional techniques without significant additional effort. Non-smooth contact surfaces generated as a result of applying linear finite element meshes, have posed a noteworthy challenge in finite element analysis involving contact simulation. Another aim of this study is to investigate the capability of the third medium contact method when used with high-order elements in order to create a smooth contact boundary as well as to reduce the size of the numerical model. The capability of the proposed third medium contact method when combined with a…

Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.

Subjects/Keywords: finite element method; contact mechanics; third medium contact; large deformation; geomechanics; coupled analysis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Khishvand, M. (2018). Application of the third medium contact method in geomechanics. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1383627

Chicago Manual of Style (16^th Edition):

Khishvand, Mohammad. “Application of the third medium contact method in geomechanics.” 2018. Doctoral Dissertation, University of Newcastle. Accessed January 15, 2021. http://hdl.handle.net/1959.13/1383627.

MLA Handbook (7^th Edition):

Khishvand, Mohammad. “Application of the third medium contact method in geomechanics.” 2018. Web. 15 Jan 2021.

Vancouver:

Khishvand M. Application of the third medium contact method in geomechanics. [Internet] [Doctoral dissertation]. University of Newcastle; 2018. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1959.13/1383627.

Council of Science Editors:

Khishvand M. Application of the third medium contact method in geomechanics. [Doctoral Dissertation]. University of Newcastle; 2018. Available from: http://hdl.handle.net/1959.13/1383627

University of Colorado

15. Shahabi, Farhad. Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis.

Degree: PhD, 2017, University of Colorado

URL: https://scholar.colorado.edu/cven_gradetds/404

► This study stands as an attempt to consider the micro-structure of materials in a continuum framework by the aid of micromorphic continuum theory in… (more)

▼ This study stands as an attempt to consider the micro-structure of materials in a continuum framework by the aid of micromorphic continuum theory in the sense of Eringen. Since classical continuum mechanics do not account for the micro-structural characteristics of materials, they cannot be used to address the macroscopic mechanical response of all micro-structured materials. In the "representative volume element (RVE)" based methods, classical continuum mechanics may be applied to analyze mechanical deformation and stresses of materials at the relevant micro-structural length-scale (such as grains of a polycrystalline metal, or sand, or metal matrix composite, etc), but when applying standard homogenization methods, such lower length scale effects get smeared out at the continuum scale. The micromorphic continuum theory provides the ability to incorporate the micro-structural effects into the macroscopic mechanical behavior. Therefore, the micromorphic continuum is a tool for a higher resolution multi-scale material modeling through capturing the material's micro-structural physics via bridging to the direct numerical simulations (DNS) at the lower length scale. In the micromorphic continuum theory of Eringen, the fundamental assumption is that the material is made of "micro-elements" in such a way that the classical continuum mechanics balance equations and thermodynamics are valid within a micro-element. Note that micro-elements represent the material's micro-structure in a micromorphic continuum. The micro-element deformation with respect to the centroid of a macroscopic continuum point is governed by an independent micro-deformation tensor χ which adds 9 additional degrees of freedom to the continuum model. The micromorphic additional degrees of freedom represent micro-stretch, micro-shear, and micro-rotation of the micro-elements. The macroscopic deformation (macro-element deformation) in the micromorphic continuum is handled through the deformation gradient tensor F. If the hypothesis of micromorphic continuum works, in a multi-scale modeling framework, assuming proper constitutive models can be formulated, and material parameters calibrated, micromorphic continuum theory may fill the gap between the RVE-micro-structural-length-scale models and the macroscopic continuum scale. The advantage of using micromorphic continuum is that it provides a chance of linking the macroscopic model to the lower length scale simulations (DNS) and reducing the computational cost by switching from DNS to the macro-scale finite element analysis or other numerical methods at the continuum scale. The linking is done through defining the overlap coupling region between the lower length scale analysis and micromorphic continuum to calibrate the material parameters and the micromorphic continuum model degrees of freedom. Therefore, in the framework of multi-scale modeling, micromorphic continuum can be used as a filter on top of the DNS simulations to capture underlying length scale and better inform the… Advisors/Committee Members: Richard A. Regueiro, Ronald Y. S. Pak, John A. Evans, Franck Vernerey, Jeong-Hoon Song.

Subjects/Keywords: dynamics; elastoplasticity; finite element analysis; large deformation; micromorphic continuum; micropolar continuum; Applied Mechanics; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shahabi, F. (2017). Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/404

Chicago Manual of Style (16^th Edition):

Shahabi, Farhad. “Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis.” 2017. Doctoral Dissertation, University of Colorado. Accessed January 15, 2021. https://scholar.colorado.edu/cven_gradetds/404.

MLA Handbook (7^th Edition):

Shahabi, Farhad. “Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis.” 2017. Web. 15 Jan 2021.

Vancouver:

Shahabi F. Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis. [Internet] [Doctoral dissertation]. University of Colorado; 2017. [cited 2021 Jan 15]. Available from: https://scholar.colorado.edu/cven_gradetds/404.

Council of Science Editors:

Shahabi F. Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis. [Doctoral Dissertation]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/cven_gradetds/404

University of Colorado

16. Shahabi, Farhad. Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis.

Degree: PhD, 2017, University of Colorado

URL: https://scholar.colorado.edu/cven_gradetds/96

► This study stands as an attempt to consider the micro-structure of materials in a continuum framework by the aid of micromorphic continuum theory in the… (more)

▼ This study stands as an attempt to consider the micro-structure of materials in a continuum framework by the aid of micromorphic continuum theory in the sense of Eringen. Since classical continuum mechanics do not account for the micro-structural characteristics of materials, they cannot be used to address the macroscopic mechanical response of all micro-structured materials. In the “representative volume element (RVE)” based methods, classical continuum mechanics may be applied to analyze mechanical deformation and stresses of materials at the relevant micro-structural length-scale (such as grains of a polycrystalline metal, or sand, or metal matrix composite, etc), but when applying standard homogenization methods, such lower length scale effects get smeared out at the continuum scale. The micromorphic continuum theory provides the ability to incorporate the micro-structural effects into the macroscopic mechanical behavior. Therefore, the micromorphic continuum is a tool for a higher resolution multi-scale material modeling through capturing the material's micro-structural physics via bridging to the direct numerical simulations (DNS) at the lower length scale. In the micromorphic continuum theory of Eringen, the fundamental assumption is that the material is made of “micro-elements” in such a way that the classical continuum mechanics balance equations and thermodynamics are valid within a micro-element. Note that micro-elements represent the material's micro-structure in a micromorphic continuum. The micro-element deformation with respect to the centroid of a macroscopic continuum point is governed by an independent micro-deformation tensor χ which adds 9 additional degrees of freedom to the continuum model. The micromorphic additional degrees of freedom represent micro-stretch, micro-shear, and micro-rotation of the micro-elements. The macroscopic deformation (macro-element deformation) in the micromorphic continuum is handled through the deformation gradient tensor F. If the hypothesis of micromorphic continuum works, in a multi-scale modeling framework, assuming proper constitutive models can be formulated, and material parameters calibrated, micromorphic continuum theory may fill the gap between the RVE-micro-structural-length-scale models and the macroscopic continuum scale. The advantage of using micromorphic continuum is that it provides a chance of linking the macroscopic model to the lower length scale simulations (DNS) and reducing the computational cost by switching from DNS to the macro-scale finite element analysis or other numerical methods at the continuum scale. The linking is done through defining the overlap coupling region between the lower length scale analysis and micromorphic continuum to calibrate the material parameters and the micromorphic continuum model degrees of freedom. Therefore, in the framework of multi-scale modeling, micromorphic continuum can be used as a filter on top of the DNS simulations to capture underlying length scale and better inform the macroscopic model. This is… Advisors/Committee Members: Richard A. Regueiro, Ronald Y. S. Pak, John A. Evans, Franck Vernerey, Jeong-Hoon Song.

Subjects/Keywords: Dynamics; Elastoplasticity; Finite Element Analysis; Large Deformation; Micromorphic Continuum; Micropolar Continuum; Engineering Mechanics; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shahabi, F. (2017). Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/96

Chicago Manual of Style (16^th Edition):

Shahabi, Farhad. “Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis.” 2017. Doctoral Dissertation, University of Colorado. Accessed January 15, 2021. https://scholar.colorado.edu/cven_gradetds/96.

MLA Handbook (7^th Edition):

Shahabi, Farhad. “Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis.” 2017. Web. 15 Jan 2021.

Vancouver:

Shahabi F. Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis. [Internet] [Doctoral dissertation]. University of Colorado; 2017. [cited 2021 Jan 15]. Available from: https://scholar.colorado.edu/cven_gradetds/96.

Council of Science Editors:

Shahabi F. Finite Strain Micromorphic Elasticity, Elastoplasticity, and Dynamics for Multiscale Finite Element Analysis. [Doctoral Dissertation]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/cven_gradetds/96

University of British Columbia

17. Osooly, Amir. Development and implementation of robust large deformation and contact mechanics capabilities in process modelling of composites.

Degree: PhD, Civil Engineering, 2008, University of British Columbia

URL: http://hdl.handle.net/2429/747

► Autoclave processing of large scale, one-piece structural parts made of carbon fiber-reinforced polymer composite materials is the key to decreasing manufacturing costs while at the… (more)

▼ Autoclave processing of large scale, one-piece structural parts made of carbon fiber-reinforced polymer composite materials is the key to decreasing manufacturing costs while at the same time increasing quality. Nonetheless, even in manufacturing simple flat parts, residual strains and stresses are unavoidable. For structural design purposes and to aid in the assembly procedures, it is desirable to have proven numerical tools that can be used to predict these residual geometrical and material properties in advance, thus avoid the costly experimental trial and error methods. A 2-D finite element-based code, COMPRO, has previously been developed in-house for predicting autoclave process-induced deformations and residual stresses in composite parts undergoing an entire cure cycle. To simulate the tool-part interaction, an important source of residual deformations/stresses, COMPRO used a non-zero thickness elastic shear layer as its only interface option. Moreover, the code did not account for the large deformations and strains and the resulting nonlinear effects that can arise during the early stages of the cure cycle when the material is rather compliant. In the present work, a contact surface employing a penalty method formulation is introduced at the tool-part interface. Its material-dependent parameters are a function of temperature, degree of cure, pressure and so forth. This makes the stick-slip condition plus separation between the part and the tool possible. The large displacements/rotations and large shear strains that develop at the early stages of the cure cycle when the resin has a very low elastic modulus provided the impetus to include a large strain/deformation option in COMPRO. A new “co-rotational stress formulation” was developed and found to provide a robust method for numerical treatment of very large deformation/strain problems involving anisotropic materials of interest here. Several verification and validation examples are used to calibrate the contact interface parameters and to demonstrate the correctness of implementation and the accuracy of the proposed method. A number of comparisons are made with exact solutions, other methods, other experiments and the same models in other commercial codes. Finally, several interesting cases are examined to explore the results of COMPRO predictions with the added options.

Subjects/Keywords: Composite material; Large deformation and stain

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APA (6^th Edition):

Osooly, A. (2008). Development and implementation of robust large deformation and contact mechanics capabilities in process modelling of composites. (Doctoral Dissertation). University of British Columbia. Retrieved from http://hdl.handle.net/2429/747

Chicago Manual of Style (16^th Edition):

Osooly, Amir. “Development and implementation of robust large deformation and contact mechanics capabilities in process modelling of composites.” 2008. Doctoral Dissertation, University of British Columbia. Accessed January 15, 2021. http://hdl.handle.net/2429/747.

MLA Handbook (7^th Edition):

Osooly, Amir. “Development and implementation of robust large deformation and contact mechanics capabilities in process modelling of composites.” 2008. Web. 15 Jan 2021.

Vancouver:

Osooly A. Development and implementation of robust large deformation and contact mechanics capabilities in process modelling of composites. [Internet] [Doctoral dissertation]. University of British Columbia; 2008. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2429/747.

Council of Science Editors:

Osooly A. Development and implementation of robust large deformation and contact mechanics capabilities in process modelling of composites. [Doctoral Dissertation]. University of British Columbia; 2008. Available from: http://hdl.handle.net/2429/747

University of Cincinnati

18. Mao, Zirui. A Novel Lagrangian Gradient Smoothing Method for Fluids and Flowing Solids.

Degree: PhD, Engineering and Applied Science: Aerospace Engineering, 2019, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252214052311

► The Smoothed Particle Hydrodynamics (SPH) method is a Lagrangian meshfree method by solving Navier-Stokes differential governing equations. With the key features of `Lagrangian’ and `meshfree’,… (more)

▼ The Smoothed Particle Hydrodynamics (SPH) method is a Lagrangian meshfree method by solving Navier-Stokes differential governing equations. With the key features of `Lagrangian’ and `meshfree’, SPH has huge advantages in tracking the free interfaces and handling large deformation. However, SPH was born with a series instability problem when particles are subjected to tension, known as the `tensile instability’. Although the instability issue can be treated completely by adopting some ad-hoc correction techniques, these additional techniques would either affect the accuracy of numerical solution or lead to a much more complicated implementation procedure. Considering that the tensile instability problem is highly related to the loose connecting mechanism of SPH particles, in this work, a SPH-like Lagrangian meshfree method, named as Lagrangian Gradient Smoothing Method or L-GSM, is proposed by replacing the SPH gradient technique with a more rigid GSM gradient operator in order to avoid the `tensile instability’ problem. The replacement of the gradient approximation technique requires a series of special treatments different from the existing SPH method in the aspects of particle-searching algorithm, supporting domain-construction algorithm, free surface with particles deficiency, boundary treatments, and how to guarantee the rigid conservation of flow in simulation.For the searching algorithm of neighboring particles, a global searching algorithm based on Delaunay triangulation and a novel local neighbor-searching (LNS) algorithm are proposed in this work for the L-GSM framework. Particularly, the newly proposed LNS algorithm can greatly enhance the computational efficiency of L-GSM and provide LL-GSM (Local L-GSM) a huge advantage over SPH in computational efficiency. For the construction of supporting domain, a 3D localized domain-constructing algorithm is developed effectively for the 3D L-GSM. To mimic the free surface effect accurately, I derived three types of correction techniques through i) assigning virtual particles beyond the free surface, ii) deducting the normalized form for the standard GSM gradient operator, and iii) deducting the consistent form for the discretized governing equations. Moreover, a stable and desirable solid boundary is also designed in this study for L-GSM framework. To ensure the conservation of flow, a conservatized form of governing equations is deducted, by which the conservation rule can be held even in the `remeshing’ (updating of neighboring particles) process. Then, the accuracy, stability and computational efficiency of the proposed L-GSM/LL-GSM framework are investigated comprehensively by conducting some theoretical analysis and numerical experiments. Finally, the L-GSM/LL-GSM model is validated by a series of applications in hydrodynamics and granular flows through comparing the L-GSM/LL-GSM solutions with the corresponding theoretical solutions, experimental results and other numerical solutions.Results show that the proposed L-GSM/LL-GSM framework can always generate an… Advisors/Committee Members: Liu, Gui-Rong (Committee Chair).

Subjects/Keywords: Geotechnology; Lagrangian Gradient Smoothing Method; Meshfree method; large deformation; Free surface flows; Hydrodynamics; Granular flows

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mao, Z. (2019). A Novel Lagrangian Gradient Smoothing Method for Fluids and Flowing Solids. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252214052311

Chicago Manual of Style (16^th Edition):

Mao, Zirui. “A Novel Lagrangian Gradient Smoothing Method for Fluids and Flowing Solids.” 2019. Doctoral Dissertation, University of Cincinnati. Accessed January 15, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252214052311.

MLA Handbook (7^th Edition):

Mao, Zirui. “A Novel Lagrangian Gradient Smoothing Method for Fluids and Flowing Solids.” 2019. Web. 15 Jan 2021.

Vancouver:

Mao Z. A Novel Lagrangian Gradient Smoothing Method for Fluids and Flowing Solids. [Internet] [Doctoral dissertation]. University of Cincinnati; 2019. [cited 2021 Jan 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252214052311.

Council of Science Editors:

Mao Z. A Novel Lagrangian Gradient Smoothing Method for Fluids and Flowing Solids. [Doctoral Dissertation]. University of Cincinnati; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252214052311

University of Texas – Austin

19. -2943-2689. Peridynamic modeling of large deformation and ductile fracture.

Degree: PhD, Engineering Mechanics, 2020, University of Texas – Austin

URL: http://dx.doi.org/10.26153/tsw/8161

► Prediction of ductile fracture, which is a prevalent failure mode in most engineering structures, is vital to numerous industries. Despite significant advancements in fracture mechanics,… (more)

▼ Prediction of ductile fracture, which is a prevalent failure mode in most engineering structures, is vital to numerous industries. Despite significant advancements in fracture mechanics, ductile fracture modeling has remained a challenging task and a continuing area of research. The peridynamic theory has attracted broad interest in recent years, for its innovative approach for simulating material damage. While peridynamics has been largely utilized to simulate cracking events in brittle materials, its ability in predicting ductile failure remains mostly untested. In this dissertation, a rigorous investigation into the capabilities of peridynamics in simulating ductile fracture in metallic alloys is undertaken. The third Sandia Fracture Challenge, as a true blind prediction challenge, is employed in this examination. In this challenge, the state of the art of the peridynamic modeling of ductile fracture is implemented to predict deformations and failure of an additively manufactured metal, with a complex geometry, under the dynamic tensile experiments performed by Sandia National Laboratories. Following the participation in the challenge, while our modeling approach led to qualitatively good blind predictions and a correctly predicted crack path, it underpredicted the load-carrying capacity of the structure and simulated an early fracture. Our post-experiment analysis identifies the main sources of discrepancy between the blind simulations and experiments to be (1) material instabilities associated with the finite deformation peridynamic model and (2) unreliability of a Lagrangian peridynamic framework in solving problems involving extremely large deformation and extensive damage. To address the aforementioned issues, a novel bond-associated, semi-Lagrangian, constitutive correspondence, peridynamic framework is proposed, in which peridynamic material point interactions depend only on their current properties (e.g. position and stress values) in the deformed configuration, and a rate-based approach is utilized to advance the state of material. A nonlocal version of the velocity gradient is presented to determine the Cauchy stress rate, using local constitutive theories, as an intermediate quantity in computing peridynamic bond forces. A novel bond-associated, correspondence damage modeling is introduced by using the bond-associated internal properties, e.g. stress and strain values, to incorporate classical failure criteria within the peridynamic framework. The new theory is employed to revisit the Sandia Fracture Challenge problem. Our results indicate that the new approach significantly improves the peridynamic predictions of large deformation and ductile fracture Advisors/Committee Members: Foster, John T., Ph. D. (advisor), Landis, Chad M. (committee member), Kyriakides, Stelios (committee member), Ravi-Chandar, Krishnaswa (committee member), Huang, Rui (committee member), Sharma, Mukul M. (committee member).

Subjects/Keywords: Peridynamics; Nonlocal; Modeling; Large deformation; Ductile fracture; Semi-Lagrangian; Sandia Fracture Challenge

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

-2943-2689. (2020). Peridynamic modeling of large deformation and ductile fracture. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/8161

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-2943-2689. “Peridynamic modeling of large deformation and ductile fracture.” 2020. Doctoral Dissertation, University of Texas – Austin. Accessed January 15, 2021. http://dx.doi.org/10.26153/tsw/8161.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-2943-2689. “Peridynamic modeling of large deformation and ductile fracture.” 2020. Web. 15 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-2943-2689. Peridynamic modeling of large deformation and ductile fracture. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2020. [cited 2021 Jan 15]. Available from: http://dx.doi.org/10.26153/tsw/8161.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-2943-2689. Peridynamic modeling of large deformation and ductile fracture. [Doctoral Dissertation]. University of Texas – Austin; 2020. Available from: http://dx.doi.org/10.26153/tsw/8161

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Sydney

20. Liu, Yang. The Development of a Novel 3D Stadium Shear Device for Perpetually Deforming Granular Soils .

Degree: 2019, University of Sydney

URL: http://hdl.handle.net/2123/19880

► Soils behave completely differently under different circumstances. For years, we have placed a particular effort into investigating how soils deform under load by conducting intensive… (more)

▼ Soils behave completely differently under different circumstances. For years, we have placed a particular effort into investigating how soils deform under load by conducting intensive laboratory tests. We have designed a variety of experimental apparatuses with which we tried to replicate the true behaviour of soils as they deform in the field. Among those testing configurations, the direct shear box and triaxial test devices are the most widely used conventional tools we use to determine the shear strength of soils. However, samples in those tests can only be sheared under very limited strains as their shape change continuously, thus losing the initial geometrical assumptions used to interpret the data. The shear strength at steady state conditions, known as critical state, is of importance to many geotechnical problems. Since this strength characterises the conditions for the onset of shear-driven natural hazards such as landslides, devices are needed that can shear soil samples to their true critical state. The ring shear device is one of the only few available large deformation devices that has been developed over the years. However, one of its major disadvantages is the imposition of radially dependent stress field on the sample due to its circular geometry. In this Thesis, we propose a new device which we call the three-dimensional “Stadium Shear Device” (3D SSD). Our idea for developing this device is devoted to the study of the shear behaviour of soils as they truly enter and remain in their critical state. It is designed in a manner that will be shown to impose uniform stress conditions. The device can shear granular systems indefinitely, while simultaneously allowing for measurements of shear and normal stresses, and the vertical displacement during the tests. We have particularly investigated the performance of this device under large shear deformations and low-stress levels, to address many applications involving such conditions, including shallow landslides and pipeline movements on seabeds. The stress conditions developed in this configuration are simulated with a Discrete Element Method (DEM) model, with which we get stress responses that are cross-validated with the experimental results obtained by the physical 3D SSD. Most importantly, the DEM simulations also confirm that the stress uniformity in SSD samples. Using this understanding, we complete a Mohr’s circle stress analysis for SSD tests. The performance of the 3D SSD device is first tested with glass beads and Jasmine rice systems, from which the effectiveness of this apparatus in capturing the mechanical properties of granular media is demonstrated. Furthermore, the device also shows its capability for measuring stress responses under different confining pressures. We thereafter conducted more robust experiments with a wider range of natural soils with various properties, including particle shapes, particle gradations and initial densities. The results are compared against results from previous studies, and in general, similar trends are…

Subjects/Keywords: large deformation; shear apparatus; granular soils; critical state; x-ray radiography; x-ray rheography

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liu, Y. (2019). The Development of a Novel 3D Stadium Shear Device for Perpetually Deforming Granular Soils . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/19880

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Yang. “The Development of a Novel 3D Stadium Shear Device for Perpetually Deforming Granular Soils .” 2019. Thesis, University of Sydney. Accessed January 15, 2021. http://hdl.handle.net/2123/19880.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Yang. “The Development of a Novel 3D Stadium Shear Device for Perpetually Deforming Granular Soils .” 2019. Web. 15 Jan 2021.

Vancouver:

Liu Y. The Development of a Novel 3D Stadium Shear Device for Perpetually Deforming Granular Soils . [Internet] [Thesis]. University of Sydney; 2019. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2123/19880.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu Y. The Development of a Novel 3D Stadium Shear Device for Perpetually Deforming Granular Soils . [Thesis]. University of Sydney; 2019. Available from: http://hdl.handle.net/2123/19880

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

North Carolina State University

21. Price, Kristin Michelle. Microstructure and Functionality of Processed Cheese: The Role of Milk Fat.

Degree: MS, Food Science, 2007, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/260

► Cooling, the final stage in processed cheese manufacturing, plays a significant role in determining the texture and firmness of the final product. To interpret cooling… (more)

▼ Cooling, the final stage in processed cheese manufacturing, plays a significant role in determining the texture and firmness of the final product. To interpret cooling mechanisms of processed cheese, model processed cheese analogues were formulated including rennet casein powder, anhydrous milk fat, and emulsifying salts. Small amplitude oscillatory shear (SAOS) and large deformation compression tests analyzed rheological properties and trends exhibited in processed cheese analogues when cooled with different cooling schedules. Two cooling rates, 0.5 °C⁄min and 0.05 °C⁄min, were selected, and based on protein network formation and fat crystallization, two significant cooling phases were identified: 80-40 °C and 40-5 °C. In all, four cooling schedules were developed from a two-by-two matrix of cooling rates and cooling phases. After the cheese analogues were cooled with the desired cooling schedules, SAOS rheology measured the complex shear modulus (G*) of cheese analogues through a frequency sweep range of 0.01-10 Hz. Utilizing the same cooling schedules, the normal, compressive strength of cheese analogue cylinders was measured and converted into shear modulus (G) values. Rheological analysis revealed that a slower cooling rate through the first phase of coolig (80-40 °C) created a firmer cheese product (larger G* and G values) when compared with a faster rate of cooling through the same temperature range. The cooling rate through the second phase of cooling, during fat crystallization, did not impact final cheese storage modulus. Small and large deformation rheological analyses found that the final cheese texture was governed by the cooling rate through the first phase of cooling (80o-40 °C), formation of the protein network. Confocal laser scanning microscopy (CLSM) was used to investigate the effects of cooling rate on the microstructure of processed cheese analogues. Micrographs of cheese analogues stained with Rhodamine B and Nile Red fluorescent probes revealed a protein ring surrounding fat droplets that formed during cooling from 80-5 °C. The protein ring thickness was not influenced by cooling cheese analogues at two different rates, 1 °C⁄min and 10 °C⁄min. However, the presence of the protein ring surrounding fat droplets in processed cheese analogues lays the framework for future study on the effects of very slow cooling rates on the thickness of the protein ring. With a better understanding of cheese rheology and cheese microstructure during cooling, cheese manufacturers can control cooling schedules to help optimize quality attributes in processed cheese. Advisors/Committee Members: Dr. Orlin Velev, Committee Member (advisor), Dr. Brian Farkas, Committee Member (advisor), Dr. Christopher Daubert, Committee Chair (advisor).

Subjects/Keywords: cooling rates; microscostructure; large deformation rheology; small deformation rheology; milk fat; processed cheese

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Price, K. M. (2007). Microstructure and Functionality of Processed Cheese: The Role of Milk Fat. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/260

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Price, Kristin Michelle. “Microstructure and Functionality of Processed Cheese: The Role of Milk Fat.” 2007. Thesis, North Carolina State University. Accessed January 15, 2021. http://www.lib.ncsu.edu/resolver/1840.16/260.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Price, Kristin Michelle. “Microstructure and Functionality of Processed Cheese: The Role of Milk Fat.” 2007. Web. 15 Jan 2021.

Vancouver:

Price KM. Microstructure and Functionality of Processed Cheese: The Role of Milk Fat. [Internet] [Thesis]. North Carolina State University; 2007. [cited 2021 Jan 15]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/260.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Price KM. Microstructure and Functionality of Processed Cheese: The Role of Milk Fat. [Thesis]. North Carolina State University; 2007. Available from: http://www.lib.ncsu.edu/resolver/1840.16/260

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

RMIT University

22. Ghaedizadeh, A. Novel designs of metamaterials and structures with negative poisson’ ratio and negative linear compressibility.

Degree: 2017, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:162267

► Materials and structures with auxetic and negative linear compressibility are of great potential to be used in many applications because of their uncommon mechanical deformation… (more)

▼ Materials and structures with auxetic and negative linear compressibility are of great potential to be used in many applications because of their uncommon mechanical deformation features. However, their design and manufacture are less studied as compared to their mechanical properties. The aim of this research is to explore several new approaches to the design and fabrication of cellular materials and structures with these two uncommon features. Poisson’s ratio and compressibility represent fundamental metrics to measure a material’s distortion under directional loading and hydrostatic pressure. In contrast to the stiffness and strength of materials, which exhibit several orders of difference, Poisson’s ratio varies in a very narrow range, i.e., from -1 to 0.5 for isotropic materials. For cellular materials, different values of Poisson’s ratio are obtained by designing the shape and topology of their microstructures. When Poisson’s ratio is negative, the corresponding material is called an auxetic material. When the performance of an auxetic material is dominated by its geometric features and deformation mechanisms of its microstructure and its Poisson’s ratio is rare in nature, it is called an auxetic metamaterial. A similar concept applies to materials and structures with negative compressibility. To investigate the design and fabrication of these metamaterials, the research starts with identifying the geometric bounds for buckling-induced auxetic metamaterials as an extension to previous work. Then, a new design approach is developed for metallic auxetic metamaterials triggered by new findings relating to loss of buckling-induced auxetic behaviour for metallic based microstructures. Subsequently, two new methodologies are developed to design and fabricate negative linear compressibility composite (NLC) structures. All significant findings and the effectiveness of design and fabrication approaches are validated by experiments. Following an introduction in Chapter 1, the current literature on auxetic and NLC metamaterials is reviewed in Chapter 2. In Chapter 3, development of auxetic metamaterial based on functionalization of base materials and topologies is described. In the first stage of this development, the geometric limits for buckling-induced auxetic metamaterials have been identified at both infinitesimal and finite strain. The previous investigation on buckling-induced auxetic metamaterial revealed that there is a geometric limit for its microstructure to exhibit auxetic behaviour in infinitesimal deformation. However, the limit for auxetic metamaterials undergoing large deformation significantly was different from that under small deformation and has not been reported yet. Thus the geometric limit was investigated in an elastic and infinitesimal deformation range using linear buckling analysis. At finite deformation range, experimentally validated finite element models were used to identify the geometric limits for auxetic metamaterials.…

Subjects/Keywords: Fields of Research; mechanical metamaterial; negative linear compressibility; negative Poisson’ ratio; auxetic; composite; elastic; buckling; large deformation; plasticity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ghaedizadeh, A. (2017). Novel designs of metamaterials and structures with negative poisson’ ratio and negative linear compressibility. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:162267

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ghaedizadeh, A. “Novel designs of metamaterials and structures with negative poisson’ ratio and negative linear compressibility.” 2017. Thesis, RMIT University. Accessed January 15, 2021. http://researchbank.rmit.edu.au/view/rmit:162267.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ghaedizadeh, A. “Novel designs of metamaterials and structures with negative poisson’ ratio and negative linear compressibility.” 2017. Web. 15 Jan 2021.

Vancouver:

Ghaedizadeh A. Novel designs of metamaterials and structures with negative poisson’ ratio and negative linear compressibility. [Internet] [Thesis]. RMIT University; 2017. [cited 2021 Jan 15]. Available from: http://researchbank.rmit.edu.au/view/rmit:162267.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ghaedizadeh A. Novel designs of metamaterials and structures with negative poisson’ ratio and negative linear compressibility. [Thesis]. RMIT University; 2017. Available from: http://researchbank.rmit.edu.au/view/rmit:162267

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

23. Trinh, Thi Lan Huong. Validation of the automated segmentation for the hippocampal subfields using Large Deformation Diffeomorphic Metric Mapping on 7T MR images and its application to volumetric and shape analysis for patients with temporal lobe epilepsy.

Degree: 2013, Johns Hopkins University

URL: http://jhir.library.jhu.edu/handle/1774.2/37107

► This thesis first aims to validate the Large Deformation Diffeomorphic Metric Mapping (LDDMM) method used in the automated segmentation of three major subfields of the… (more)

▼ This thesis first aims to validate the Large Deformation Diffeomorphic Metric Mapping (LDDMM) method used in the automated segmentation of three major subfields of the hippocampus known as Cornu Ammonis (CA), dentate gyrus (DG) and subiculum (SUB) on the 7T T1 MR images with the isotropic resolution of 0.6 × 0.6 × 0.6 〖mm〗³. Our results showed that using a population template to generate automated subfield segmentation gave better results than diffeomorphically transferring the subfields directly from one subject to another. Our averaged distances are within one voxel size (Left CA: 0.73 mm, left DG: 0.70 mm, left SUB: 0.66 mm, right CA: 0.79 mm, right DG: 0.71 mm, right SUB: 0.74 mm). Our Dice overlap coefficients are reasonable enough for thin structures and more consistent among different subfield than others (Van Leemput et al., 2012) (Left CA: 0.72, left DG: 0.76, left SUB: 0.76, right CA: 0.67, right DG: 0.76, right SUB: 0.70). Based on the validation results, we further implemented our volumetric and shape analysis for the hippocampus and its subfields to the study of patients with temporal lobe epilepsy (TLE) to detect any malformation that has been observed in histopathology of hippocampal sclerosis (HS). 25 subjects in the study were divided into four groups: Group A (control group), Group B (patients with unilateral temporal lobe epilepsy with clear 3T abnormality), Group C (patients with unilateral TLE with no clear 3T abnormality) and Group D (patients with subtle malformation of cortical development seen on 3T). The histogram with Gaussian kernel estimation of the Jacobian determinants showed enormous local shrinkage on all subfields in Group B, on left CA and left DG in Group D and left SUB in Group C. In the permutation test with the two-sample Kolmogorov-Smirnov statistics and in the Wilcoxon Mann-Whitney test with False Discovery Rate adjusted p-values, we obtained significant results indicating differences in the subfields among groups that can be explained by the two major pathological processes of HS observed in patients with TLE. Thus, we can detect specific changes on subfields for patients with TLE based on in-vivo ultrahigh field medical images. Advisors/Committee Members: Barker, Peter B (advisor).

Subjects/Keywords: Large Deformation Diffeomorphic Metric Mapping; 7T MRI; automated segmentation; temporal lobe epilepsy; volumetric analysis; shape analysis; hippocampal subfields

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Trinh, T. L. H. (2013). Validation of the automated segmentation for the hippocampal subfields using Large Deformation Diffeomorphic Metric Mapping on 7T MR images and its application to volumetric and shape analysis for patients with temporal lobe epilepsy. (Thesis). Johns Hopkins University. Retrieved from http://jhir.library.jhu.edu/handle/1774.2/37107

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Trinh, Thi Lan Huong. “Validation of the automated segmentation for the hippocampal subfields using Large Deformation Diffeomorphic Metric Mapping on 7T MR images and its application to volumetric and shape analysis for patients with temporal lobe epilepsy.” 2013. Thesis, Johns Hopkins University. Accessed January 15, 2021. http://jhir.library.jhu.edu/handle/1774.2/37107.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Trinh, Thi Lan Huong. “Validation of the automated segmentation for the hippocampal subfields using Large Deformation Diffeomorphic Metric Mapping on 7T MR images and its application to volumetric and shape analysis for patients with temporal lobe epilepsy.” 2013. Web. 15 Jan 2021.

Vancouver:

Trinh TLH. Validation of the automated segmentation for the hippocampal subfields using Large Deformation Diffeomorphic Metric Mapping on 7T MR images and its application to volumetric and shape analysis for patients with temporal lobe epilepsy. [Internet] [Thesis]. Johns Hopkins University; 2013. [cited 2021 Jan 15]. Available from: http://jhir.library.jhu.edu/handle/1774.2/37107.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Trinh TLH. Validation of the automated segmentation for the hippocampal subfields using Large Deformation Diffeomorphic Metric Mapping on 7T MR images and its application to volumetric and shape analysis for patients with temporal lobe epilepsy. [Thesis]. Johns Hopkins University; 2013. Available from: http://jhir.library.jhu.edu/handle/1774.2/37107

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Newcastle

24. Zhang, Xue. Particle finite element method in geomechanics.

Degree: PhD, 2014, University of Newcastle

URL: http://hdl.handle.net/1959.13/1055070

►

Research Doctorate - Doctor of Philosophy (PhD)

Despite the wide application of the finite element method (FEM) in geotechnical engineering, the numerical analysis usually stops… (more)

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Research Doctorate - Doctor of Philosophy (PhD)

Despite the wide application of the finite element method (FEM) in geotechnical engineering, the numerical analysis usually stops at the point when soil flow occurs and results in overall `failure'. In many cases, the so-called failure only represents a specific time point of the deformation process and the soil flow itself is of interest as well. A typical example is a landslide in which a transition of the soil behaviour is experienced from solid-like to liquid-like, and then back to solid-like. For such problems, a correct understanding of the triggering mechanism is important. However, the prediction of the sliding process as well as the estimation of the final deposit are also of great concern. Unfortunately, the traditional Lagrangian FEM cannot handle problems involving both solid-like and liquid-like behaviour. This is to a large extent, due to the following two issues: (1) Severe mesh distortion and boundary evolution as a result of large changes in geometry. (2) Difficulties in solving the highly nonlinear and non-smooth discrete governing equations in an efficient and robust manner. In this thesis, a new continuum approach that addresses the above two issues explicitly is proposed for handling problems involving the solid-liquid transitional behaviour in geomechanics. More specifically, the first issue is solved via the so-called Particle Finite Element Method (PFEM) originally proposed for the solution of fluid dynamics problems involving free surfaces. The key feature of the PFEM is that mesh nodes are treated as a cloud of particles which can move freely and even separate from the domain to which they originally belong. At each time step, the computational domain is detected based on those particles; then, the conventional FEM is used to solve the problem on the identified domain. Regarding the second issue, mathematical programming formulations for the dynamic analysis of elastoplastic behaviour are developed with a wide utilisation of the Hellinger-Reissner variational theorem. The resulting formulations can be cast as a second-order cone program and solved via appropriate optimization methods. Unlike the conventional Newton-Raphson based FE scheme, the convergence of the solution of the scheme developed is guaranteed regardless of the quality of the initial solution. Formulations for both plane strain and axisymmetric problems are developed. Moreover, the contact between deformable bodies and rigid boundaries is also taken into account. A number of challenging problems in plane strain cases are solved successfully, which demonstrates the capabilities of the proposed approach. Furthermore, the approach is used to reproduce laboratory tests involving the collapse of axisymmetric granular columns. A quantitative comparison between the simulated results and the existing experimental data is conducted. Finally, an actual natural disaster event, the Yangbaodi landslide, is considered and analysed in some detail.

Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.

Subjects/Keywords: particle finite element method; mathematical programming; mixed finite element method; second-order cone programming; large deformation; dynamics; contact; granular matter

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, X. (2014). Particle finite element method in geomechanics. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1055070

Chicago Manual of Style (16^th Edition):

Zhang, Xue. “Particle finite element method in geomechanics.” 2014. Doctoral Dissertation, University of Newcastle. Accessed January 15, 2021. http://hdl.handle.net/1959.13/1055070.

MLA Handbook (7^th Edition):

Zhang, Xue. “Particle finite element method in geomechanics.” 2014. Web. 15 Jan 2021.

Vancouver:

Zhang X. Particle finite element method in geomechanics. [Internet] [Doctoral dissertation]. University of Newcastle; 2014. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1959.13/1055070.

Council of Science Editors:

Zhang X. Particle finite element method in geomechanics. [Doctoral Dissertation]. University of Newcastle; 2014. Available from: http://hdl.handle.net/1959.13/1055070

North Carolina State University

25. Zhang, Junhua. Mechanisms Responsible for Non-linear and Fracture Properties of Gel-based Foods.

Degree: PhD, Food Science, 2005, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/5110

► The well-defined chemical, physical, and especially elastic properties possessed by polyacrylamide gels facilitate the characterization of the gel network through rheological measurements. The results produced… (more)

▼ The well-defined chemical, physical, and especially elastic properties possessed by polyacrylamide gels facilitate the characterization of the gel network through rheological measurements. The results produced fracture properties associated with gel network crosslink density and chain length. The linear stress-strain relationship up to fracture for the gels, as well as the constant fracture strain regardless of network chain length, indicated there was no direct relationship between fracture strain and network chain length. Therefore, gel fracture did not simply result from the limitation of network chain stretching, and a new perspective is required to explain strain-hardening phenomena frequently observed for biopolymers. Alginate gels showed strain-hardening behavior at large deformation. Considering the large size of junction zones, serving as the crosslinks in the gels, a hypothesis was proposed to explain the strain-hardening mechanism: the behavior was attributed to the deformation of rod-like junction zones. This hypothesis was substantiated by a relationship between the gel network and formulation. A mathematical model, based on the hypothesis, was developed and supported this claim. The fracture stress of alginate gels correlated with gel formulation, similar to polyacrylamide gels. While association of fracture strain with the gel formulation was complicated. The fracture strain was not directly correlated with a single parameter, but rather, the fracture strain was predicted based on fracture stress, small-strain shear modulus, and a fitted parameter describing non-linearity of the gel. For elastic gels, no viscous flow is experienced during large deformation; but for viscoelastic gels, viscous flow was observed. These observations revealed the fracture characteristics of elastic and viscoelastic gels. For elastic gels, the fracture occurred when the chemical bond between chemical crosslinks failed on a macroscopic level. However, for viscoelastic gels, the viscous flow resulted from the micro-structural change within junction zones, which was a rate or time-dependent process. The failure of viscoelastic gels was caused by the disruption of junction zones. Additives influenced the gel fracture properties for elastic and viscoelastic gels. For elastic gels, the effect of dextran and glycerol on fracture properties was caused by a transition in the fracture mode. For alginate gels, the effect of additive on the gel fracture properties was not related to fracture mode, but depended on the additive molecular size. The liquid phase viscosity conveyed by additives did not account for the fracture property change. Advisors/Committee Members: Allen Foegeding, Committee Co-Chair (advisor), Christopher Daubert, Committee Chair (advisor).

Subjects/Keywords: Food gels; Non-linearity; Large deformation; fracture properties

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, J. (2005). Mechanisms Responsible for Non-linear and Fracture Properties of Gel-based Foods. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/5110

Chicago Manual of Style (16^th Edition):

Zhang, Junhua. “Mechanisms Responsible for Non-linear and Fracture Properties of Gel-based Foods.” 2005. Doctoral Dissertation, North Carolina State University. Accessed January 15, 2021. http://www.lib.ncsu.edu/resolver/1840.16/5110.

MLA Handbook (7^th Edition):

Zhang, Junhua. “Mechanisms Responsible for Non-linear and Fracture Properties of Gel-based Foods.” 2005. Web. 15 Jan 2021.

Vancouver:

Zhang J. Mechanisms Responsible for Non-linear and Fracture Properties of Gel-based Foods. [Internet] [Doctoral dissertation]. North Carolina State University; 2005. [cited 2021 Jan 15]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5110.

Council of Science Editors:

Zhang J. Mechanisms Responsible for Non-linear and Fracture Properties of Gel-based Foods. [Doctoral Dissertation]. North Carolina State University; 2005. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5110

University of Adelaide

26. Wen, Jie. An analytical model for two-layered composite beams with partial shear interaction based on a higher order beam theory.

Degree: 2017, University of Adelaide

URL: http://hdl.handle.net/2440/114021

► The application of composite structures is quite frequent in various structural engineering activities due to their super mechanical properties and structural performances. A composite beam… (more)

▼ The application of composite structures is quite frequent in various structural engineering activities due to their super mechanical properties and structural performances. A composite beam consisting of two material layers, such as steel-concrete, steel-timber, and timber-timber is typically used in the construction industry to enhance the overall performance due to a proper utilization of two material layers in this structural system. In reality, the shear connectors such as bolts, nails or steel shear studs, commonly used to connect the two layers, are having a certain degree of deformability due to a finite stiffness of these shear connectors. This induces a shear slip at the interface between the two layers which is known as partial shear interaction. This is an important feature which needs to be considered in the modelling of composite beams. In the present study, the shear connectors are modelled as distributed shear springs along the length of composite beams in the present study. A higher order beam theory (HBT) is used to consider the effect of transverses hear deformation accurately by taking a third order variation of the longitudinal displacement across the beam depth. Since HBT allows a true parabolic vibration of the shear stress that vanishes at the top and bottom fibres of the beam, no shear correction factor needs to be used. In addition to the prediction for the beam global response such as deflection or vibration frequency, HBT also predicts the local response such as distribution of stresses accurately, which cannot be achieved by the existing models based on Euler-Bernoulli beam theory (EBT) or Timoshenko beam theory (TBT). In the present study, exact analytical models based on HBT are developed for the static bending response, flexural free and forced vibration response, and geometric nonlinear static flexural response of two-layered composite beams with partial shear interaction. The principle of virtual work and the Hamilton’s principle are applied to derive the governing equations for static and dynamic analysis, respectively, where the Navier type solution technique is used to solve these equations analytically. In order to assess the accuracy and efficiency of the proposed analytical models, the results produced by the models are compared with the results reported in literature by previous researchers and numerical results predicted by a one dimensional finite element model based on HBT as well as by a detailed two-dimensional finite element modelling of composite beams. Advisors/Committee Members: Sheikh, Abdul Hamid (advisor), School of Civil, Environmental and Mining Engineering (school).

Subjects/Keywords: composite beams; analytical solution; higher order beam theory; partial shear interaction; dynamic response; large deformation analysis; Research by Publication

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wen, J. (2017). An analytical model for two-layered composite beams with partial shear interaction based on a higher order beam theory. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/114021

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wen, Jie. “An analytical model for two-layered composite beams with partial shear interaction based on a higher order beam theory.” 2017. Thesis, University of Adelaide. Accessed January 15, 2021. http://hdl.handle.net/2440/114021.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wen, Jie. “An analytical model for two-layered composite beams with partial shear interaction based on a higher order beam theory.” 2017. Web. 15 Jan 2021.

Vancouver:

Wen J. An analytical model for two-layered composite beams with partial shear interaction based on a higher order beam theory. [Internet] [Thesis]. University of Adelaide; 2017. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2440/114021.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wen J. An analytical model for two-layered composite beams with partial shear interaction based on a higher order beam theory. [Thesis]. University of Adelaide; 2017. Available from: http://hdl.handle.net/2440/114021

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

27. Dinh, Anh Tuan. Comportement élastique linéaire et non-linéaire du bois en relation avec sa structure : Linear elastic and non-linear behaviour of wood according to its structure.

Degree: Docteur es, Sciences forestières et du bois, 2011, Paris, AgroParisTech

URL: http://www.theses.fr/2011AGPT0066

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Le bois est un matériau complexe, hétérogène et anisotrope. Ses propriétés mécaniques varient fortement en fonction de l'essence et de l'échelle considérées. Pour mieux comprendre… (more)

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Le bois est un matériau complexe, hétérogène et anisotrope. Ses propriétés mécaniques varient fortement en fonction de l'essence et de l'échelle considérées. Pour mieux comprendre le comportement du bois en fonction de sa structure, nous proposons dans le cadre de cette thèse une étude expérimentale à l'échelle des tissus qui est réalisée sur plusieurs types de bois : bois de peuplier, y compris bois de tension et bois d'épicéa. Compte tenu des faibles dimensions des échantillons testés, les mesures de déformation sont effectuées « sans contact » afin de s'assurer de ne pas perturber l'échantillon en cours de l'essai.Les premières séries de mesures sont réalisées sur les trois zones (tendue, normale, opposée) et selon les 3 directions matérielles (longitudinale, radiale et tangentielle) d'une tige de peuplier inclinée. Les résultats obtenus permettent de comparer des comportements mécaniques du bois de peuplier dans toutes les zones considérées en fonction de ses propriétés microscopiques.Les deuxièmes séries de mesures sont réalisées en compression, grandes déformations, dans la chambre d'un ESEM (Microscope électronique à balayage environnemental) sur du bois feuillu (peuplier) et sur du bois résineux (épicéa). Grâce aux images obtenues en période d'essai, du domaine élastique jusqu'à la densification, la réponse de chaque type du bois à la même sollicitation est illustrée.Enfin, une partie de la modélisation numérique par la MPM (Materiel Point Method) est proposée dans notre projet envisagé comme prolongement de ce travail. Il permettra de simuler le comportement mécanique du bois en grande déformation.

Wood is a complex, heterogeneous and anisotropic material. Its mechanical properties are highly variable according to the species and scale considered. In order to better understand the behaviour of wood in relation to its structure, this PhD work proposes an experimental study at the tissue scale. This work is performed on several types of wood: poplar, including tension wood and spruce. Considering the small dimensions of the tested samples, a “non-contact” method is used to limit perturbations, therefore ensuring the measurement precision.The first series of measurements were realised in the three zones (tension, normal, opposite) and for the three material directions (longitudinal, radial and tangential) of an inclined poplar tree. The results obtained allowed us to compare the mechanical properties of poplar wood in all zones in relation to their microscopic features.The second series of tests were performed in the chamber of an ESEM (Environmental Scanning Electron Microscope) on hardwood (poplar) and softwood (spruce). With the images obtained during the test, from the elastic zone to the densification, the response of each type of wood to the same solicitation is presented and commented.Finally, some numerical modelling by the MPM (Material Point Method) is proposed as prospects of the present work. It will allow the mechanical behaviour of wood in large deformation to be predicted.

Advisors/Committee Members: Perré, Patrick (thesis director).

Subjects/Keywords: Peuplier; Epicéa; Couche G; Compression en grande déformation; Esem; Mpm; Poplar; Spruce; G layer; Compression in large deformation; Esem; Mpm; 333.75

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dinh, A. T. (2011). Comportement élastique linéaire et non-linéaire du bois en relation avec sa structure : Linear elastic and non-linear behaviour of wood according to its structure. (Doctoral Dissertation). Paris, AgroParisTech. Retrieved from http://www.theses.fr/2011AGPT0066

Chicago Manual of Style (16^th Edition):

Dinh, Anh Tuan. “Comportement élastique linéaire et non-linéaire du bois en relation avec sa structure : Linear elastic and non-linear behaviour of wood according to its structure.” 2011. Doctoral Dissertation, Paris, AgroParisTech. Accessed January 15, 2021. http://www.theses.fr/2011AGPT0066.

MLA Handbook (7^th Edition):

Dinh, Anh Tuan. “Comportement élastique linéaire et non-linéaire du bois en relation avec sa structure : Linear elastic and non-linear behaviour of wood according to its structure.” 2011. Web. 15 Jan 2021.

Vancouver:

Dinh AT. Comportement élastique linéaire et non-linéaire du bois en relation avec sa structure : Linear elastic and non-linear behaviour of wood according to its structure. [Internet] [Doctoral dissertation]. Paris, AgroParisTech; 2011. [cited 2021 Jan 15]. Available from: http://www.theses.fr/2011AGPT0066.

Council of Science Editors:

Dinh AT. Comportement élastique linéaire et non-linéaire du bois en relation avec sa structure : Linear elastic and non-linear behaviour of wood according to its structure. [Doctoral Dissertation]. Paris, AgroParisTech; 2011. Available from: http://www.theses.fr/2011AGPT0066

28. Khedimi, Farid. Modélisation micromécanique des élastomères chargés : Genes that reprogram adult cells to pluripotent stem cells : expression and implications in human plasma cell cancers.

Degree: Docteur es, Mécanique des Solides, 2011, Aix-Marseille 1

URL: http://www.theses.fr/2011AIX10051

►

Ce travail porte sur la modélisation micromécanique des élastomères chargés. On cherche principalement à d'une part identifier l'influence des propriétés des différentes phases (morphologie et… (more)

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Ce travail porte sur la modélisation micromécanique des élastomères chargés. On cherche principalement à d'une part identifier l'influence des propriétés des différentes phases (morphologie et comportement) sur la réponse macroscopique, et d'autre part explorer les mécanismes d'interactions qui peuvent avoir lieu au sein de la micro-structure. Pour ce faire, on a mené une étude à deux échelles d'observations et ce à l'aide de simulations numériques basées sur l'homogénéisation. Le premier niveau correspond à une échelle mésoscopique pour laquelle on considère un Volume Élémentaire Représentatif (VER) bi-phasique, constitué d'un agglomérat de charge dissipatif, noyé dans une matrice hyperélastique. Le second niveau consiste, à une plus petite échelle, à explorer le comportement d'un agglomérat idéalisé, constitué de particules de charges infiniment rigides liées entre elles par une mince couche de gomme. Cette micro-structure est générée de manière aléatoire par un tirage de polygones de Voronoï. Des calculs éléments finis sont réalisés en élasticité linéaire et non-linéaire dans un contexte d'homogénéisation numérique en utilisant diverses techniques de localisation. Les différentes analyses menées montrent notamment que l'hypothèse d'affinité n'est pas adaptée à ce type de micro-structures et que le caractère incompressible de la gomme ainsi que son confinement jouent un rôle prépondérant sur le comportement mécanique de l'agglomérat.

This work focuses on the micro mechanical modeling of filled elastomers. The major question to be identified: firstly the influence of the properties of different phases (morphology and behavior) on the macroscopic response, and also to explore the mechanisms of interactions that take place within the micro-structure. To do this, we conducted a study at two scales of observations and using the numerical simulations based on homogenization. The first level corresponds to a mesoscopic scale for which we consider a representative elementary volume (REV), biphasic, consisting of a homogeneous dissipative inclusion (agglomerate) embedded in a hyperelastic matrix. The second level is at a smaller scale, to explore the behavior of an idealized agglomerate, consisting of infinitely rigid filler particles bounded together by a thin layer of rubber. This micro-structure is randomly generated by a random Voronoï polygons. Finite element calculations are performed in linear elasticity and nonlinear in the context of numerical homogenization using various localization techniques. The results show in particular that the assumption of affinity is not suitable for this type of micro-structures and the incompressibility of the rubber and its containment play an important role on the mechanical behavior of the agglomerate.

Advisors/Committee Members: Boukamel, Adnane (thesis director), Bourgeois, Stéphane (thesis director).

Subjects/Keywords: Élastomère chargé; Grandes déformations; Homogénéisation numérique; Polygones de Voronoï; Filled rubber; Large deformation; Numerical homogenization; Voronoï polygons

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APA (6^th Edition):

Khedimi, F. (2011). Modélisation micromécanique des élastomères chargés : Genes that reprogram adult cells to pluripotent stem cells : expression and implications in human plasma cell cancers. (Doctoral Dissertation). Aix-Marseille 1. Retrieved from http://www.theses.fr/2011AIX10051

Chicago Manual of Style (16^th Edition):

Khedimi, Farid. “Modélisation micromécanique des élastomères chargés : Genes that reprogram adult cells to pluripotent stem cells : expression and implications in human plasma cell cancers.” 2011. Doctoral Dissertation, Aix-Marseille 1. Accessed January 15, 2021. http://www.theses.fr/2011AIX10051.

MLA Handbook (7^th Edition):

Khedimi, Farid. “Modélisation micromécanique des élastomères chargés : Genes that reprogram adult cells to pluripotent stem cells : expression and implications in human plasma cell cancers.” 2011. Web. 15 Jan 2021.

Vancouver:

Khedimi F. Modélisation micromécanique des élastomères chargés : Genes that reprogram adult cells to pluripotent stem cells : expression and implications in human plasma cell cancers. [Internet] [Doctoral dissertation]. Aix-Marseille 1; 2011. [cited 2021 Jan 15]. Available from: http://www.theses.fr/2011AIX10051.

Council of Science Editors:

Khedimi F. Modélisation micromécanique des élastomères chargés : Genes that reprogram adult cells to pluripotent stem cells : expression and implications in human plasma cell cancers. [Doctoral Dissertation]. Aix-Marseille 1; 2011. Available from: http://www.theses.fr/2011AIX10051

Freie Universität Berlin

29. Youett, Jonathan William. Dynamische Kontaktprobleme mit großen Deformationen und Anwendungen in der virtuellen Medizin.

Degree: 2016, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-6219

► Die Hüftoperationsplanung heutzutage basiert trotz modernster Technologien immer noch hauptsächlich auf Röntgenbildern. Das Gelenkzentrum, die Grösse und die Position eines Implantats werden dabei oft nur… (more)

▼ Die Hüftoperationsplanung heutzutage basiert trotz modernster Technologien immer noch hauptsächlich auf Röntgenbildern. Das Gelenkzentrum, die Grösse und die Position eines Implantats werden dabei oft nur mit Hilfe von simplen Schablonen bestimmt. Daraus resultierend lag die Rate an sekundären Hüftoperation im Jahre 2006 bei fast 15%. Ziel der Dissertation ist die Entwicklung eines patienten-spezifischen Finite-Element Hüftmodells, welches für die Schätzung der Spannungen während alltäglicher Bewegungen verwendet werden kann. Der Kern eines solchen Modells liegt in der akkuraten Modellierung und Simulation von dynamischen Kontaktproblemen mit grossen Deformationen. In dem ersten Teil dieser Arbeit leiten wir auf der Vorarbeit von "Kane et al., Finite element analysis of nonsmooth contact, 1999" eine neuartige Formulierung von Kontaktproblemen her, welche auf einer Erweiterung des Hamiltonschen Prinzips basieren. Diese Formulierung hat den Vorteil, dass die Kontaktkräfte nur implizit auftreten und variationell konsistent aus dem Residuum der gelösten Gleichung wiederhergeleitet werden können. Für diese schwache Formulierung entwickeln wir eine Stabilisierung der implizierten Mittelpunktsregel, welche das energetische Verhalten des Zeit-Integrators deutlich verbessert. Wegen der erschwerten theoretischen Analyse des Verfahrens, wird dieses nur numerisch getestet und Schritte zur weiteren Verbesserung vorgeschlagen. Das Hauptresultat dieser Arbeit liegt in der Entwicklung eines inexakten Filter Verfahrens für die Lösung der diskretisierten Probleme. Zur Beschleunigung des Lösers werden solange wie möglich approximierte Linearisierungen der Nicht-Durchdringungs-Bedingung verwendet, welche mit schnellen monotonen Mehrgitter Verfahren gelöst werden können. Die Erweiterung der monotonen Mehrgitter für nicht-konvexe Probleme, genauso wie ein Beweis der globalen Konvergenz wird hergeleitet und numerisch bestätigt. Ebenso wird die Konvergenz des inexakten Filter Verfahrens bewiesen, solange der Approximationsfehler der inexakten Linearisierung kontrolliert wird. Im zweiten Teil der Dissertation wird eine heterogenes Finite-Element Hüftmodell bestehend aus dem Femur und Pelvis Knochen und den drei Hauptbändern vorgestellt. Dies ist eine direkte Erweiterung des Knie- Modells "Oliver Sander et al., Towards an efficient numerical simulation of complex 3D knee joint motion" auf nichtlineare Materialien und gross e Deformationen. Im Zuge dessen wird eine neue Kontaktmodellierung, Diskretisierung und Lösungsverfahren für Cosserat Stäbe mit starren Hindernissen entwickelt, welche zur Darstellung der Bänder benutzt werden. Erste Ergebnisse einer Bewegungsraumanalyse und ein Vergleich mit einem Starrkörper-Ansatz werden durchgeführt. Advisors/Committee Members: [email protected] (contact), m (gender), Prof. Dr. Ralf Kornhuber (firstReferee), Prof. Dr. Rolf Krause (furtherReferee).

Subjects/Keywords: large deformation contact; contact-stabilised midpoint rule; mortar method; inexact filter trust-region; 500 Naturwissenschaften und Mathematik::510 Mathematik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Youett, J. W. (2016). Dynamische Kontaktprobleme mit großen Deformationen und Anwendungen in der virtuellen Medizin. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-6219

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Youett, Jonathan William. “Dynamische Kontaktprobleme mit großen Deformationen und Anwendungen in der virtuellen Medizin.” 2016. Thesis, Freie Universität Berlin. Accessed January 15, 2021. http://dx.doi.org/10.17169/refubium-6219.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Youett, Jonathan William. “Dynamische Kontaktprobleme mit großen Deformationen und Anwendungen in der virtuellen Medizin.” 2016. Web. 15 Jan 2021.

Vancouver:

Youett JW. Dynamische Kontaktprobleme mit großen Deformationen und Anwendungen in der virtuellen Medizin. [Internet] [Thesis]. Freie Universität Berlin; 2016. [cited 2021 Jan 15]. Available from: http://dx.doi.org/10.17169/refubium-6219.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Youett JW. Dynamische Kontaktprobleme mit großen Deformationen und Anwendungen in der virtuellen Medizin. [Thesis]. Freie Universität Berlin; 2016. Available from: http://dx.doi.org/10.17169/refubium-6219

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

30. Bharadwaj, Narayanan Ashwin Kumar. Low dimensional intrinsic material functions uniquely identify rheological constitutive models and infer material microstructure.

Degree: MS, 0133, 2013, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/42175

► Rheological material functions are used to form our conceptual understanding of a material response. For a nonlinear rheological response, the associated material functions span a… (more)

▼ Rheological material functions are used to form our conceptual understanding of a material response. For a nonlinear rheological response, the associated material functions span a high-dimensional space. A theoretical framework is developed to outline lowdimensional measures for describing asymptotic nonlinear responses in large-amplitude oscillatory shear (LAOS). Nomenclature is introduced to provide physical interpretations for these newly developed intrinsic measures under both shear strain-control (LAOStrain) and shear stress-control (LAOStress) protocols. Analytical solutions are surveyed for these intrinsic signatures of constitutive model responses to imposed large-amplitude oscillatory shear strain (LAOStrain) and translated into the language of intrinsic Chebyshev coefficients to allow for comparison and conceptual interpretation. Considered constitutive models include that of a third order fluid, corotational Maxwell model, Giesekus model, and other specific models for polymer melts, rodlike polymer solutions, and emulsions. New analytical results are derived for two transient nonlinear-elastic network models; finitely extensible nonlinear elastic (FENE) and wormlike chain (WLC) models. A library of analytical intrinsic LAOStrain fingerprints is thus generated. The intrinsic signatures for all these models are only a function of the imposed frequency and a nonlinear parameter, if any. Interesting sign changes are observed in the intrinsic signatures across constitutive models that help compare and contrast between. Under a defined deformation protocol, a numerical approach may be required to converge on solutions to constitutive equations that may not have an analytical solution. A robust numerical scheme is thus developed for quick and efficient extraction of intrinsic LAOStrain nonlinearities for nonlinear constitutive models. The proposed numerical algorithm is used to extract intrinsic LAOStrain material functions for the single mode pompom model and the intrinsic signatures are compared for different combinations of the associated nonlinear parameters. With slight modifications, the numerical scheme is applicable for any differential or integral constitutive model. They are equally flexible to accommodate for increased iii nonlinearities in the system arising from modifications to constitutive equations in their current form. The utility of these measures is demonstrated by experimentally measuring the frequencydependent intrinsic LAOStrain nonlinearities for a polymeric hydrogel (PVA-Borax). Techniques for accurate extraction of the subdominant intrinsic measures are presented. Physical interpretations are provided through the obtained intrinsic signatures of the PVABorax system. The four measured intrinsic nonlinear fingerprints are compared with the available analytical and numerical library of intrinsic fingerprints. The matching process identifies a unique constitutive equation, fits the nonlinear model parameter, and implies molecular- and micro-scale… Advisors/Committee Members: Ewoldt, Randy H. (advisor).

Subjects/Keywords: Material functions; large-amplitude oscillatory shear (LAOS); Oscillatory deformation; Chebyshev coefficients; intrinsic nonlinearities; LAOS nonlinearities; oscillatory shear

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APA (6^th Edition):

Bharadwaj, N. A. K. (2013). Low dimensional intrinsic material functions uniquely identify rheological constitutive models and infer material microstructure. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/42175

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bharadwaj, Narayanan Ashwin Kumar. “Low dimensional intrinsic material functions uniquely identify rheological constitutive models and infer material microstructure.” 2013. Thesis, University of Illinois – Urbana-Champaign. Accessed January 15, 2021. http://hdl.handle.net/2142/42175.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bharadwaj, Narayanan Ashwin Kumar. “Low dimensional intrinsic material functions uniquely identify rheological constitutive models and infer material microstructure.” 2013. Web. 15 Jan 2021.

Vancouver:

Bharadwaj NAK. Low dimensional intrinsic material functions uniquely identify rheological constitutive models and infer material microstructure. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2142/42175.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bharadwaj NAK. Low dimensional intrinsic material functions uniquely identify rheological constitutive models and infer material microstructure. [Thesis]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/42175

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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