subject:(Fracture mechanics)

Oregon State University

1. Addison, Dylan, A. Time-Dependent Crack Growth Mechanisms in Alloy 617 at 800°C in Air.

Degree: MS, 2017, Oregon State University

URL: http://hdl.handle.net/1957/61609

► Time-dependent crack growth mechanisms in Alloy 617 at 800°C in air were studied using compact tension samples machined in the L-T direction, cracked at temperature… (more)

Subjects/Keywords: Fracture Mechanics

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APA (6^th Edition):

Addison, Dylan, A. (2017). Time-Dependent Crack Growth Mechanisms in Alloy 617 at 800°C in Air. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/61609

Chicago Manual of Style (16^th Edition):

Addison, Dylan, A. “Time-Dependent Crack Growth Mechanisms in Alloy 617 at 800°C in Air.” 2017. Masters Thesis, Oregon State University. Accessed February 23, 2020. http://hdl.handle.net/1957/61609.

MLA Handbook (7^th Edition):

Addison, Dylan, A. “Time-Dependent Crack Growth Mechanisms in Alloy 617 at 800°C in Air.” 2017. Web. 23 Feb 2020.

Vancouver:

Addison, Dylan A. Time-Dependent Crack Growth Mechanisms in Alloy 617 at 800°C in Air. [Internet] [Masters thesis]. Oregon State University; 2017. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/1957/61609.

Council of Science Editors:

Addison, Dylan A. Time-Dependent Crack Growth Mechanisms in Alloy 617 at 800°C in Air. [Masters Thesis]. Oregon State University; 2017. Available from: http://hdl.handle.net/1957/61609

University of Hong Kong

2. Chen, Hongniao. Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials.

Degree: PhD, 2013, University of Hong Kong

URL: Chen, H. [陈红鸟]. (2013). Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4979944 ; http://dx.doi.org/10.5353/th_b4979944 ; http://hdl.handle.net/10722/181510

► This thesis presents experimental and numerical investigations on the fracture properties of quasi-brittle materials, including mortar, concrete and graphite. Fracture toughness in terms of the… (more)

▼ This thesis presents experimental and numerical investigations on the fracture properties of quasi-brittle materials, including mortar, concrete and graphite. Fracture toughness in terms of the critical stress intensity factor K_IC and fracture energy G_F of the materials were determined through three-point bending tests on centre-notched beams. Furthermore, full-field displacement of the beams subjected to bend was obtained using Electronic Speckle Pattern Interferometry (ESPI) technique. In order to verify the accuracy of the displacement data measured using the ESPI technique and to obtain reliable deformation information, the displacement and strain errors induced by the rigid-body motions of the specimen were quantified. This study found that the displacement errors were negligible whereas the strain errors were notable and must be eliminated. The influence of different rigid-body motions was analyzed. It was found that the out-of-plane movement of the specimen was critical and affected considerably the accuracy of strain data. Thus the experimental setup was improved accordingly to eliminate the influence of critical rigid-body motions. Quasi-brittle materials have a finite stress region near the crack tip, known as the fracture process zone (FPZ). The materials exhibit nonlinear fracture behaviour in the FPZ. The cohesive crack model (CCM) is widely used to characterize the nonlinear fracture behaviour of quasi-brittle materials. According to the CCM, all the nonlinear behaviours in the FPZ can be represented by a cohesive crack, and the crack propagation is controlled by the relationship between the cohesive stress and crack opening, namely, the tension softening curve (TSC). Thus an accurate estimation of the TSC is essential. In order to determine the TSC of quasi-brittle materials, an incremental displacement collocation method (IDCM) was originally developed in this study. In the IDCM, the deformation data measured by the ESPI sensor was analyzed to obtain the crack opening displacement (COD) of the notched specimens. The experimental COD profiles together with the CCM were then integrated into a finite element model to simulate the nonlinear fracture response of the specimen. By minimizing the difference between the computed and measured displacements at selected collocation points, the cohesive stress corresponding to certain crack opening was determined. The entire TSC was constructed in a step-by-step manner following the loading steps. The IDCM was first applied to estimate the TSC of mortar. By using the estimated TSC, the displacements of the specimen under certain loading levels were computed. By comparing the computed displacements with the experimental data, the reliability of the IDCM and the accuracy of the estimated TSC were verified. The application of the IDCM was further extended to the determination of the TSCs of concrete and graphite. The parameters used to define the shape of the TSC of the materials were determined using regression analysis. The applicability of those… Advisors/Committee Members: Kwan, AKH, Su, KL.

Subjects/Keywords: Brittleness.; Fracture mechanics.

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APA (6^th Edition):

Chen, H. (2013). Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials. (Doctoral Dissertation). University of Hong Kong. Retrieved from Chen, H. [陈红鸟]. (2013). Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4979944 ; http://dx.doi.org/10.5353/th_b4979944 ; http://hdl.handle.net/10722/181510

Chicago Manual of Style (16^th Edition):

Chen, Hongniao. “Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials.” 2013. Doctoral Dissertation, University of Hong Kong. Accessed February 23, 2020. Chen, H. [陈红鸟]. (2013). Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4979944 ; http://dx.doi.org/10.5353/th_b4979944 ; http://hdl.handle.net/10722/181510.

MLA Handbook (7^th Edition):

Chen, Hongniao. “Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials.” 2013. Web. 23 Feb 2020.

Vancouver:

Chen H. Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials. [Internet] [Doctoral dissertation]. University of Hong Kong; 2013. [cited 2020 Feb 23]. Available from: Chen, H. [陈红鸟]. (2013). Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4979944 ; http://dx.doi.org/10.5353/th_b4979944 ; http://hdl.handle.net/10722/181510.

Council of Science Editors:

Chen H. Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials. [Doctoral Dissertation]. University of Hong Kong; 2013. Available from: Chen, H. [陈红鸟]. (2013). Incremental displacement collocation method for the determination of fracture properties of quasi-brittle materials. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4979944 ; http://dx.doi.org/10.5353/th_b4979944 ; http://hdl.handle.net/10722/181510

3. Muñiz Calvente, Miguel. The generalized local model: A methodology for probabilistic assessment of fracture under different failure criteria .

Degree: 2017, Universidad de Oviedo

URL: http://hdl.handle.net/10651/40748

► When designing structural and mechanical components, the criteria of structural integrity must be accomplished. Such criteria consist in assuring that the component will perform its… (more)

▼ When designing structural and mechanical components, the criteria of structural integrity must be accomplished. Such criteria consist in assuring that the component will perform its designed function of supporting loads or any kind of actions causing stress and strains in the material without catastrophic failure. This implies, from the point of view of fracture mechanics, safe prediction of static, dynamic and fatigue failure what requires previous knowledge of the loads, but also the mechanical properties of the component material such as density, hardness, strength and toughness and the dimensions (shape, size and thickness) which should be suitable to withstand the actions operating on it. Moreover, this concept requires performing an experimental program and its statistical analysis, as well as the interpretation of the results obtained, in order to achieve the mechanical characterization of the material. The latter consists in the probabilistic definition of the critical values of the reference parameter, denoted generalized parameter (GP), that will be used as a property related to the material to predict failure of the components made of such material. In this doctoral thesis, an approach is presented aiming at providing an objective definition of the material characterization in order to guarantee transferability from the experimental results obtained, irrespective of the test chosen and the shape and size of the specimen, to the component design. This methodology, which is denoted Generalized Local Model (GLM) because it represents a general solution without restrictions of former particular local models, provides the statistical information related to the distribution of the reference parameter considered, i.e. the primary failure cumulative distribution (PFCDF), which is identified as a characteristic property of the material under study. Moreover, this allows a possible assessment and eventual selection of the generalized parameter (GP) to be made as a result of the evaluation of its suitability. After the GLM is introduced and justified, some of its extensions are presented in order to overcome some usual situations arising during the evaluation of experimental results. First, the GLM is applied to the joint evaluation of experimental data from different programs, using different specimen or even test types, as they were a unique sample. In this way, higher reliability in the derivation of the primary failure cumulative distribution function (PFCDF) is achieved. Second, a methodology is developed and applied to solve the assessment of the so-called confounded data case (concurrent flaw populations) as an extension of the GLM. This allows the PFCDF to be obtained independently of the failure type involved. Third, the extension of the GLM to the fatigue lifetime analysis is justified as a result of the conjunction of the GLM and the fatigue Weibull model developed by Castillo and Canteli. The application of the models proposed in this doctoral thesis is illustrated using practical examples, such as: a)… Advisors/Committee Members: Fernández Canteli, Alfonso Carlos (advisor).

Subjects/Keywords: Probabilistic fracture mechanics

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APA (6^th Edition):

Muñiz Calvente, M. (2017). The generalized local model: A methodology for probabilistic assessment of fracture under different failure criteria . (Doctoral Dissertation). Universidad de Oviedo. Retrieved from http://hdl.handle.net/10651/40748

Chicago Manual of Style (16^th Edition):

Muñiz Calvente, Miguel. “The generalized local model: A methodology for probabilistic assessment of fracture under different failure criteria .” 2017. Doctoral Dissertation, Universidad de Oviedo. Accessed February 23, 2020. http://hdl.handle.net/10651/40748.

MLA Handbook (7^th Edition):

Muñiz Calvente, Miguel. “The generalized local model: A methodology for probabilistic assessment of fracture under different failure criteria .” 2017. Web. 23 Feb 2020.

Vancouver:

Muñiz Calvente M. The generalized local model: A methodology for probabilistic assessment of fracture under different failure criteria . [Internet] [Doctoral dissertation]. Universidad de Oviedo; 2017. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/10651/40748.

Council of Science Editors:

Muñiz Calvente M. The generalized local model: A methodology for probabilistic assessment of fracture under different failure criteria . [Doctoral Dissertation]. Universidad de Oviedo; 2017. Available from: http://hdl.handle.net/10651/40748

Hong Kong University of Science and Technology

4. Xie, Tao. Effect of electrostatic tractions on the fracture behavior of a dielectric/piezoelectric material under mechanical and/or electric loading.

Degree: 2013, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-62370 ; https://doi.org/10.14711/thesis-b1255097 ; http://repository.ust.hk/ir/bitstream/1783.1-62370/1/th_redirect.html

► The effect of electrostatic tractions on the fracture behavior of a dielectric material under mechanical and/or electric loading is analyzed first by studying a pre-cracked… (more)

▼ The effect of electrostatic tractions on the fracture behavior of a dielectric material under mechanical and/or electric loading is analyzed first by studying a pre-cracked parallel-plate capacitor and illustrated by plots. The research is then extended into the case of piezoelectric materials considering the anisotropic material properties and the piezoelectric effect. The results are illustrated by plots based on a specific lead zirconate titanate (PZT-5H) sample, and also for another piezoelectric material with even higher dielectric/piezoelectric constants. The results are presented in terms of electrostatic tractions, crack opening/closing, and energy release rate. For dielectric materials, electrostatic tractions on the electrodes compress the material in front of the crack tip and stretch the material behind the crack tip, having the tendency to close the crack. Mechanical load is the driving force to propagate the crack, while applied electric field retards crack propagation due to the electrostatic tractions. As a direct consequence, the fracture criterion is composed of two parts: the energy release rate must exceed a critical value and the mechanical load must be higher than the critical value for crack opening. The investigation into piezoelectric materials indicates that influence of electrostatic tractions depends on the direction of applied electric field due to the piezoelectric effect. Under a positive electric field (aligned with the poling direction), the electrostatic tractions stretch the material behind the crack tip and have the tendency to close the crack. While under a negative electric field (opposite to the poling direction), the electrostatic tractions compress the material behind the crack tip and promotes crack opening process. Mechanical load is always the driving force to propagate the crack, while the effect of electric loading on the crack propagation due to the electrostatic tractions depends on applied electric field direction. The fracture criterion is composed of two parts: the energy release rate must exceed a critical value and the mechanical load must be higher than the critical value for crack opening. Special attention has to be paid to the loading condition under negative electric field due to its contribution to assisting in the crack opening process.

Subjects/Keywords: Piezoelectric materials ; Fracture ; Dielectrics ; Fracture mechanics

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APA (6^th Edition):

Xie, T. (2013). Effect of electrostatic tractions on the fracture behavior of a dielectric/piezoelectric material under mechanical and/or electric loading. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-62370 ; https://doi.org/10.14711/thesis-b1255097 ; http://repository.ust.hk/ir/bitstream/1783.1-62370/1/th_redirect.html

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):

Xie, Tao. “Effect of electrostatic tractions on the fracture behavior of a dielectric/piezoelectric material under mechanical and/or electric loading.” 2013. Thesis, Hong Kong University of Science and Technology. Accessed February 23, 2020. http://repository.ust.hk/ir/Record/1783.1-62370 ; https://doi.org/10.14711/thesis-b1255097 ; http://repository.ust.hk/ir/bitstream/1783.1-62370/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Xie, Tao. “Effect of electrostatic tractions on the fracture behavior of a dielectric/piezoelectric material under mechanical and/or electric loading.” 2013. Web. 23 Feb 2020.

Vancouver:

Xie T. Effect of electrostatic tractions on the fracture behavior of a dielectric/piezoelectric material under mechanical and/or electric loading. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2013. [cited 2020 Feb 23]. Available from: http://repository.ust.hk/ir/Record/1783.1-62370 ; https://doi.org/10.14711/thesis-b1255097 ; http://repository.ust.hk/ir/bitstream/1783.1-62370/1/th_redirect.html.

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

Council of Science Editors:

Xie T. Effect of electrostatic tractions on the fracture behavior of a dielectric/piezoelectric material under mechanical and/or electric loading. [Thesis]. Hong Kong University of Science and Technology; 2013. Available from: http://repository.ust.hk/ir/Record/1783.1-62370 ; https://doi.org/10.14711/thesis-b1255097 ; http://repository.ust.hk/ir/bitstream/1783.1-62370/1/th_redirect.html

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

Hong Kong University of Science and Technology

5. Chen, E. Study on concrete strength under uniaxial and biaxial loadings from the view of fracture mechanics.

Degree: 2011, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-7386 ; https://doi.org/10.14711/thesis-b1154860 ; http://repository.ust.hk/ir/bitstream/1783.1-7386/1/th_redirect.html

► Biaxial compression tests on cubic concrete specimens were performed on a newly designed triaxial machine. Specially designed steel brush platens were adopted in biaxial experiments… (more)

▼ Biaxial compression tests on cubic concrete specimens were performed on a newly designed triaxial machine. Specially designed steel brush platens were adopted in biaxial experiments to reduce the end friction in order to obtain real uniform compression state in the specimens. Concrete with different maximum aggregate sizes were tested for their biaxial compressive strength, with fracture energy and characteristic length examined at the same time. It was found that the biaxial compressive strength of concrete was intrinsically dependent on the fracture energy and characteristic length rather than the uniaxial strength. Therefore, by introducing the fracture parameters, a trend of biaxial failure envelope can be more accurately described than previous research in which the uniaxial strength was always taken as the basis for deriving the envelope. This finding may provide a more accurate design criterion based on fracture parameters in multiaxial problems. On the other hand, numerical simulation of concrete behavior under uniaxial tension, uniaxial compression and combined compression-tension was carried out based on a proposed local softening model by the nonlinear finite element software ATENA. Pure mode I crack was assumed under uniaxial tension and the equivalent wing crack system was employed for uniaxial compression and biaxial compression-tension. The local softening behavior was simulated by means of the interface material model in ATENA. The relationships among the uniaxial compressive strength, tensile strength and the fracture energy under tension were well reproduced compared with the empirical relations. This implies that the local softening law can be viewed as the linkage of these macroscopic properties. Numerical biaxial compressive-tensile strengths based on the local softening model also showed good agreement with available experimental results. Therefore, non-linear fracture mechanics with the local softening law at the sub-macro-scale seems to be suitable for analyzing concrete behaviors at the macro-scale.

Subjects/Keywords: Concrete – Fracture – Mathematical models ; Fracture mechanics

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APA (6^th Edition):

Chen, E. (2011). Study on concrete strength under uniaxial and biaxial loadings from the view of fracture mechanics. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-7386 ; https://doi.org/10.14711/thesis-b1154860 ; http://repository.ust.hk/ir/bitstream/1783.1-7386/1/th_redirect.html

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, E. “Study on concrete strength under uniaxial and biaxial loadings from the view of fracture mechanics.” 2011. Thesis, Hong Kong University of Science and Technology. Accessed February 23, 2020. http://repository.ust.hk/ir/Record/1783.1-7386 ; https://doi.org/10.14711/thesis-b1154860 ; http://repository.ust.hk/ir/bitstream/1783.1-7386/1/th_redirect.html.

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, E. “Study on concrete strength under uniaxial and biaxial loadings from the view of fracture mechanics.” 2011. Web. 23 Feb 2020.

Vancouver:

Chen E. Study on concrete strength under uniaxial and biaxial loadings from the view of fracture mechanics. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2011. [cited 2020 Feb 23]. Available from: http://repository.ust.hk/ir/Record/1783.1-7386 ; https://doi.org/10.14711/thesis-b1154860 ; http://repository.ust.hk/ir/bitstream/1783.1-7386/1/th_redirect.html.

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

Council of Science Editors:

Chen E. Study on concrete strength under uniaxial and biaxial loadings from the view of fracture mechanics. [Thesis]. Hong Kong University of Science and Technology; 2011. Available from: http://repository.ust.hk/ir/Record/1783.1-7386 ; https://doi.org/10.14711/thesis-b1154860 ; http://repository.ust.hk/ir/bitstream/1783.1-7386/1/th_redirect.html

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

University of Aberdeen

6. Winiarski, Bartlomiej. Multi-scale modelling of compressive behaviour of materials with pronounced internal microstructure.

Degree: 2010, University of Aberdeen

URL: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540438

► Aviation and aerospace structural components made of composite laminates due to their internal structure and manufacturing methods contain a number of inter- and intracomponent defects,… (more)

▼ Aviation and aerospace structural components made of composite laminates due to their internal structure and manufacturing methods contain a number of inter- and intracomponent defects, which size, dispersion and interaction alter significantly the critical compression strain level. While there are a plethora of theoretical and experimental work on the problems stability loss and fracture of composites with internal defects in the scope of classic problems of fracture mechanics, there are few theoretical and numerical analyses available for the nonclassical problems of fracture mechanics of composites compressed along layers with interface cracks. These analyses usually have been considered the simplest problems, where the composite material with pronounced microstructure and interface defects (cracks, delaminations) have been analysed as two-dimensional (2-D) continuum in the condition of plane strain state. In the scope of these analyses only parallel defects have been considered, allowing for the interpenetration of the stress-free crack faces, or assuming so-called interfacial cracks with connected edges. This thesis broadens knowledge in the area of non-classical problems of fracture mechanics. It investigates the effect of interfacial cracks interaction on the critical buckling strain in layered and fibrous composite materials under compressive static loading. The behaviour of composite is analysed on several length-scales, starting from a ply and laminate levels (in 2-D approximation), down to a single-fibre level (a full 3-D model). The statements of the problems are based on the model of piecewise-homogeneous medium model, the most accurate within the framework of the mechanics of deformable bodies as applied to composite materials with pronounced microstructure. All composite constituents are modelled as linear-elastic material, where both isotropic and anisotropic materials are considered depending on the length-scale. It is assumed that the moment of stability loss in the microstructure of materials is treated as the onset of the fracture process. Besides that, the critical strain that corresponds to loss of stability in the microstructure of the composite, either surface or internal instability, must be smaller than the critical strain that corresponds to loss of stability of the entire composite. This project involves parameterised variables, such as the crack size, the crack spacing, the layer volume fraction and the fibre volume fraction. At each length-scale two types of cracks are analysed, namely, cracks with stress-free crack faces and cracks with frictionless Hertzian contact of the crack faces. A number of finite-element models for each length-scale are developed, and are validated analytically and numerically. The models' ability to simulate practical composite structures to a useful degree of accuracy with suitable material properties is discussed. A number of parameters, which quantifies the interfacial crack interaction and crack faces contact interaction phenomena, are introduced and…

Subjects/Keywords: 620.112; Fracture mechanics : Composite materials

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APA (6^th Edition):

Winiarski, B. (2010). Multi-scale modelling of compressive behaviour of materials with pronounced internal microstructure. (Doctoral Dissertation). University of Aberdeen. Retrieved from http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540438

Chicago Manual of Style (16^th Edition):

Winiarski, Bartlomiej. “Multi-scale modelling of compressive behaviour of materials with pronounced internal microstructure.” 2010. Doctoral Dissertation, University of Aberdeen. Accessed February 23, 2020. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540438.

MLA Handbook (7^th Edition):

Winiarski, Bartlomiej. “Multi-scale modelling of compressive behaviour of materials with pronounced internal microstructure.” 2010. Web. 23 Feb 2020.

Vancouver:

Winiarski B. Multi-scale modelling of compressive behaviour of materials with pronounced internal microstructure. [Internet] [Doctoral dissertation]. University of Aberdeen; 2010. [cited 2020 Feb 23]. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540438.

Council of Science Editors:

Winiarski B. Multi-scale modelling of compressive behaviour of materials with pronounced internal microstructure. [Doctoral Dissertation]. University of Aberdeen; 2010. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540438

Texas A&M University

7. Huang, Yu-Hsuan. On Coating Durability of Polymer Coated Sheet Metal under Plastic Deformation.

Degree: 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7887

► Polymer coated sheet metal components find diverse applications in many industries. The manufacturing of the components generally involves forming of sheet metal into the desired… (more)

▼ Polymer coated sheet metal components find diverse applications in many industries. The manufacturing of the components generally involves forming of sheet metal into the desired shape and coating of the formed part with organic coating. An alternative manufacturing route is to coat the sheet metal first before forming. The change in the manufacturing sequence can potentially improve cost and reduce environmental impact. This approach, however, requires the coating to survive the deformation process. Thus, the effect of plastic deformation on coating adhesion is of primary interest to many engineers and researchers. This research aims at developing a methodology to predict the adhesion of coating after metal forming processes. A pull-off apparatus that measures the coating pull-off stress was used to indicate the coating adhesion strength. Several types of specimen were designed to obtain uniaxial tension, biaxial tension, and tension-compression deformation modes on pre-coated sheet by using a uniaxial tensile tester. Experimental results from two selected polymer coated sheet metals show that coating adhesion was affected by plastic deformation. An analytical model based on a virtual interface crack concept was developed to indicate the adhesion potential of the coating-substrate interface. From interfacial fracture mechanics, the initial adhesion potential is defined as the energy release rate characterized by the virtual interface crack and the initial pull-off stress. The analytical model was used to predict coating adhesion loss after deformation in uniaxial tension mode. The analytical model predictions agreed well with experimental results. Finite element analysis tool was applied to simulate more complex deformation modes in stamping of coated sheet meals. The stress field near the interface crack tip was used to calculate the energy release rate and predict the adhesion loss under different deformation modes. The predictions obtained from numerical method are also in good agreements with the experimental results in biaxial tension and tension-compression modes. The research has led to a better understanding of the effects of plastic deformation on coating adhesion. The developed adhesion test methods can be used to generate useful information on coating durability for diverse practical use. It is also expected that the results of the research will facilitate the development of better polymer coated sheet metal to be used in sheet metal forming processes. Advisors/Committee Members: Wang, Jyhwen (advisor), Gao, Xin-Lin (committee member), Karaman, Ibrahim (committee member), Ding, Yu (committee member).

Subjects/Keywords: Polyurethane; Fracture mechanics; Interfaces; Durability

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APA (6^th Edition):

Huang, Y. (2011). On Coating Durability of Polymer Coated Sheet Metal under Plastic Deformation. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7887

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):

Huang, Yu-Hsuan. “On Coating Durability of Polymer Coated Sheet Metal under Plastic Deformation.” 2011. Thesis, Texas A&M University. Accessed February 23, 2020. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7887.

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

MLA Handbook (7^th Edition):

Huang, Yu-Hsuan. “On Coating Durability of Polymer Coated Sheet Metal under Plastic Deformation.” 2011. Web. 23 Feb 2020.

Vancouver:

Huang Y. On Coating Durability of Polymer Coated Sheet Metal under Plastic Deformation. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7887.

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

Council of Science Editors:

Huang Y. On Coating Durability of Polymer Coated Sheet Metal under Plastic Deformation. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7887

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

Oregon State University

8. Keary, Paul Edward. A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials.

Degree: MS, Mechanical Engineering, 1984, Oregon State University

URL: http://hdl.handle.net/1957/41236

► Three approaches for evaluating mode I interlaminar strain energy release rates in graphite/epoxy composites were compared using experimental data from double cantilever beam specimens. Expressions… (more)

Subjects/Keywords: Fracture mechanics

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APA (6^th Edition):

Keary, P. E. (1984). A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/41236

Chicago Manual of Style (16^th Edition):

Keary, Paul Edward. “A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials.” 1984. Masters Thesis, Oregon State University. Accessed February 23, 2020. http://hdl.handle.net/1957/41236.

MLA Handbook (7^th Edition):

Keary, Paul Edward. “A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials.” 1984. Web. 23 Feb 2020.

Vancouver:

Keary PE. A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials. [Internet] [Masters thesis]. Oregon State University; 1984. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/1957/41236.

Council of Science Editors:

Keary PE. A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials. [Masters Thesis]. Oregon State University; 1984. Available from: http://hdl.handle.net/1957/41236

University of Hong Kong

9. 鄧偉; Deng, Wei. Advances in interfacial crack/inclusion problems and constitutive models in solids.

Degree: PhD, 1997, University of Hong Kong

URL: Deng, W. [鄧偉]. (1997). Advances in interfacial crack/inclusion problems and constitutive models in solids. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123574 ; http://dx.doi.org/10.5353/th_b3123574 ; http://hdl.handle.net/10722/34639

published_or_final_version

Mechanical Engineering

Doctoral

Doctor of Philosophy

Subjects/Keywords: Fracture mechanics.

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APA (6^th Edition):

鄧偉; Deng, W. (1997). Advances in interfacial crack/inclusion problems and constitutive models in solids. (Doctoral Dissertation). University of Hong Kong. Retrieved from Deng, W. [鄧偉]. (1997). Advances in interfacial crack/inclusion problems and constitutive models in solids. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123574 ; http://dx.doi.org/10.5353/th_b3123574 ; http://hdl.handle.net/10722/34639

Chicago Manual of Style (16^th Edition):

鄧偉; Deng, Wei. “Advances in interfacial crack/inclusion problems and constitutive models in solids.” 1997. Doctoral Dissertation, University of Hong Kong. Accessed February 23, 2020. Deng, W. [鄧偉]. (1997). Advances in interfacial crack/inclusion problems and constitutive models in solids. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123574 ; http://dx.doi.org/10.5353/th_b3123574 ; http://hdl.handle.net/10722/34639.

MLA Handbook (7^th Edition):

鄧偉; Deng, Wei. “Advances in interfacial crack/inclusion problems and constitutive models in solids.” 1997. Web. 23 Feb 2020.

Vancouver:

鄧偉; Deng W. Advances in interfacial crack/inclusion problems and constitutive models in solids. [Internet] [Doctoral dissertation]. University of Hong Kong; 1997. [cited 2020 Feb 23]. Available from: Deng, W. [鄧偉]. (1997). Advances in interfacial crack/inclusion problems and constitutive models in solids. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123574 ; http://dx.doi.org/10.5353/th_b3123574 ; http://hdl.handle.net/10722/34639.

Council of Science Editors:

鄧偉; Deng W. Advances in interfacial crack/inclusion problems and constitutive models in solids. [Doctoral Dissertation]. University of Hong Kong; 1997. Available from: Deng, W. [鄧偉]. (1997). Advances in interfacial crack/inclusion problems and constitutive models in solids. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123574 ; http://dx.doi.org/10.5353/th_b3123574 ; http://hdl.handle.net/10722/34639

University of Hong Kong

10. 馬鵬; Ma, Peng. New interfacial crack models for plane fracture problems in magnetoelectroelastic bimaterials.

Degree: PhD, 2016, University of Hong Kong

URL: http://hdl.handle.net/10722/235859

► Magnetoelectroelastic (MEE) materials are a class of new multifunctional composites. They have been promising candidates for the core components of adaptive systems, for example, sensors,… (more)

▼ Magnetoelectroelastic (MEE) materials are a class of new multifunctional composites. They have been promising candidates for the core components of adaptive systems, for example, sensors, actuators, transducers, and microwave devices, owing to their special coupling effects among elastic, electric and magnetic fields. In engineering practice, layered structures are very common. In such structures, interface delamination will result in interfacial cracks, which is the main reason behind structural failure. In the past couple of decades, although many researchers have studied the interfacial crack problems of MEE materials, most of their work is on the basis of Griffith crack model, in which the stresses in the vicinity of the crack tips have oscillating singularity. This is not realistic in practice. Therefore, this thesis is devoted to developing more rational interfacial crack models for investigation of the fracture behaviors of MEE bimaterials. First, in order to eliminate the oscillating behaviour of stresses near the crack tip, an electrically conductive interface crack model with a frictionless contact zone in an MEE bimaterial is developed. A combined Dirichlet-Riemann and Hilbert boundary value problem is formulated and solved analytically. Second, the crack models with pre-fracture zones are developed between two MEE materials, which are adhered by means of a thin interlayer, and the extended stresses are assumed to be finite within the pre-fracture zones. By utilizing the corresponding boundary conditions, the aforementioned problems are finally formulated mathematically as a system of equations. The fracture parameters, such as lengths of contact zone and pre-fracture zones, field intensity factors and the extended displacement jumps at the initial crack tips, related to these two sorts of models are provided. Numerical results are presented to study the influence of various factors on the fracture parameters. Third, as an alternative to Green’s function, the integral identities are derived for a semi-infinite interfacial crack problem in an anisotropic MEE bimaterial subjected to an asymmetric load on the crack surface. This crack problem is formulated in terms of singular integral equations, which establish the relationship between the applied external load and the extended displacement jumps across the crack faces. Illustrative examples demonstrate that the proposed method is very convenient for the fracture analysis of MEE solids. Finally, a static fracture analysis of interfacial crack problems in MEE bimaterials is presented with the extended finite element method (X-FEM). In order to capture the oscillating singularity of the stresses near the crack tip, suitable crack tip enrichment functions for MEE bimaterials are newly derived and applied to perform X-FEM analysis. By comparing yielded results with the analytical and numerical solutions of the corresponding interfacial crack problems, the validity of the proposed formulation is verified. All the aforementioned work can significantly…

Subjects/Keywords: Composite materials; Fracture mechanics

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APA (6^th Edition):

馬鵬; Ma, P. (2016). New interfacial crack models for plane fracture problems in magnetoelectroelastic bimaterials. (Doctoral Dissertation). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/235859

Chicago Manual of Style (16^th Edition):

馬鵬; Ma, Peng. “New interfacial crack models for plane fracture problems in magnetoelectroelastic bimaterials.” 2016. Doctoral Dissertation, University of Hong Kong. Accessed February 23, 2020. http://hdl.handle.net/10722/235859.

MLA Handbook (7^th Edition):

馬鵬; Ma, Peng. “New interfacial crack models for plane fracture problems in magnetoelectroelastic bimaterials.” 2016. Web. 23 Feb 2020.

Vancouver:

馬鵬; Ma P. New interfacial crack models for plane fracture problems in magnetoelectroelastic bimaterials. [Internet] [Doctoral dissertation]. University of Hong Kong; 2016. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/10722/235859.

Council of Science Editors:

馬鵬; Ma P. New interfacial crack models for plane fracture problems in magnetoelectroelastic bimaterials. [Doctoral Dissertation]. University of Hong Kong; 2016. Available from: http://hdl.handle.net/10722/235859

University of Hong Kong

11. 蘇啓亮; Su, Kai-leung. Fractal two-level finite element method for elastic crack analysis.

Degree: PhD, 1996, University of Hong Kong

URL: Su, K. [蘇啓亮]. (1996). Fractal two-level finite element method for elastic crack analysis. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123532 ; http://dx.doi.org/10.5353/th_b3123532 ; http://hdl.handle.net/10722/35013

published_or_final_version

Civil and Structural Engineering

Doctoral

Doctor of Philosophy

Subjects/Keywords: Fracture mechanics.

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APA (6^th Edition):

蘇啓亮; Su, K. (1996). Fractal two-level finite element method for elastic crack analysis. (Doctoral Dissertation). University of Hong Kong. Retrieved from Su, K. [蘇啓亮]. (1996). Fractal two-level finite element method for elastic crack analysis. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123532 ; http://dx.doi.org/10.5353/th_b3123532 ; http://hdl.handle.net/10722/35013

Chicago Manual of Style (16^th Edition):

蘇啓亮; Su, Kai-leung. “Fractal two-level finite element method for elastic crack analysis.” 1996. Doctoral Dissertation, University of Hong Kong. Accessed February 23, 2020. Su, K. [蘇啓亮]. (1996). Fractal two-level finite element method for elastic crack analysis. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123532 ; http://dx.doi.org/10.5353/th_b3123532 ; http://hdl.handle.net/10722/35013.

MLA Handbook (7^th Edition):

蘇啓亮; Su, Kai-leung. “Fractal two-level finite element method for elastic crack analysis.” 1996. Web. 23 Feb 2020.

Vancouver:

蘇啓亮; Su K. Fractal two-level finite element method for elastic crack analysis. [Internet] [Doctoral dissertation]. University of Hong Kong; 1996. [cited 2020 Feb 23]. Available from: Su, K. [蘇啓亮]. (1996). Fractal two-level finite element method for elastic crack analysis. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123532 ; http://dx.doi.org/10.5353/th_b3123532 ; http://hdl.handle.net/10722/35013.

Council of Science Editors:

蘇啓亮; Su K. Fractal two-level finite element method for elastic crack analysis. [Doctoral Dissertation]. University of Hong Kong; 1996. Available from: Su, K. [蘇啓亮]. (1996). Fractal two-level finite element method for elastic crack analysis. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b3123532 ; http://dx.doi.org/10.5353/th_b3123532 ; http://hdl.handle.net/10722/35013

University of Minnesota

12. Zhu, Zhiren. A Probabilistic Model for Failure of Polycrystaline Silicon MEMS Structures.

Degree: MS, Civil Engineering, 2015, University of Minnesota

URL: http://hdl.handle.net/11299/174740

► Reliable MEMS devices are expected to have a very low failure probability, and thus it is cost-prohibitive to determine design strength values merely based on… (more)

Subjects/Keywords: failure; fracture mechanics; reliability; strength

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APA (6^th Edition):

Zhu, Z. (2015). A Probabilistic Model for Failure of Polycrystaline Silicon MEMS Structures. (Masters Thesis). University of Minnesota. Retrieved from http://hdl.handle.net/11299/174740

Chicago Manual of Style (16^th Edition):

Zhu, Zhiren. “A Probabilistic Model for Failure of Polycrystaline Silicon MEMS Structures.” 2015. Masters Thesis, University of Minnesota. Accessed February 23, 2020. http://hdl.handle.net/11299/174740.

MLA Handbook (7^th Edition):

Zhu, Zhiren. “A Probabilistic Model for Failure of Polycrystaline Silicon MEMS Structures.” 2015. Web. 23 Feb 2020.

Vancouver:

Zhu Z. A Probabilistic Model for Failure of Polycrystaline Silicon MEMS Structures. [Internet] [Masters thesis]. University of Minnesota; 2015. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/11299/174740.

Council of Science Editors:

Zhu Z. A Probabilistic Model for Failure of Polycrystaline Silicon MEMS Structures. [Masters Thesis]. University of Minnesota; 2015. Available from: http://hdl.handle.net/11299/174740

University of Nairobi

13. Masu, Leonard P. M. A fracture mechanics approach to fatigue crack propagation characteristics in a locally used structural steel plate .

Degree: 1984, University of Nairobi

URL: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/16028

► A fracture mechanics approach was used to investigate the effects of thickness, stress ratio and configurational geometry on fatigue crack growth characteristics of a locally… (more)

Subjects/Keywords: Fracture mechanics

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APA (6^th Edition):

Masu, L. P. M. (1984). A fracture mechanics approach to fatigue crack propagation characteristics in a locally used structural steel plate . (Thesis). University of Nairobi. Retrieved from http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/16028

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):

Masu, Leonard P M. “A fracture mechanics approach to fatigue crack propagation characteristics in a locally used structural steel plate .” 1984. Thesis, University of Nairobi. Accessed February 23, 2020. http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/16028.

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

MLA Handbook (7^th Edition):

Masu, Leonard P M. “A fracture mechanics approach to fatigue crack propagation characteristics in a locally used structural steel plate .” 1984. Web. 23 Feb 2020.

Vancouver:

Masu LPM. A fracture mechanics approach to fatigue crack propagation characteristics in a locally used structural steel plate . [Internet] [Thesis]. University of Nairobi; 1984. [cited 2020 Feb 23]. Available from: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/16028.

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

Council of Science Editors:

Masu LPM. A fracture mechanics approach to fatigue crack propagation characteristics in a locally used structural steel plate . [Thesis]. University of Nairobi; 1984. Available from: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/16028

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

University of Manchester

14. Mansoulié, Christophe. Investigations on Leak-Before-Break (LBB) analysis.

Degree: 2010, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:89277

► The present thesis was written by Christophe Mansoulié at the University ofManchester in pursuance of the degree of Master of Philosophy. It presents“Investigations on Leak-Before-Break… (more)

Subjects/Keywords: LBB; R6; Code_Aster; fracture mechanics

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APA (6^th Edition):

Mansoulié, C. (2010). Investigations on Leak-Before-Break (LBB) analysis. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:89277

Chicago Manual of Style (16^th Edition):

Mansoulié, Christophe. “Investigations on Leak-Before-Break (LBB) analysis.” 2010. Doctoral Dissertation, University of Manchester. Accessed February 23, 2020. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:89277.

MLA Handbook (7^th Edition):

Mansoulié, Christophe. “Investigations on Leak-Before-Break (LBB) analysis.” 2010. Web. 23 Feb 2020.

Vancouver:

Mansoulié C. Investigations on Leak-Before-Break (LBB) analysis. [Internet] [Doctoral dissertation]. University of Manchester; 2010. [cited 2020 Feb 23]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:89277.

Council of Science Editors:

Mansoulié C. Investigations on Leak-Before-Break (LBB) analysis. [Doctoral Dissertation]. University of Manchester; 2010. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:89277

University of Sydney

15. Davies, Benjamin Rhys. Multi-Scale Films Inspired by Bone .

Degree: 2016, University of Sydney

URL: http://hdl.handle.net/2123/15374

► The mechanical properties of bone, specifically the combination of strength and toughness, when adjusted for the mechanical properties of its constituent materials exceeds the performance… (more)

Subjects/Keywords: bone; fracture mechanics; hierarchal structure

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APA (6^th Edition):

Davies, B. R. (2016). Multi-Scale Films Inspired by Bone . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/15374

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):

Davies, Benjamin Rhys. “Multi-Scale Films Inspired by Bone .” 2016. Thesis, University of Sydney. Accessed February 23, 2020. http://hdl.handle.net/2123/15374.

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

MLA Handbook (7^th Edition):

Davies, Benjamin Rhys. “Multi-Scale Films Inspired by Bone .” 2016. Web. 23 Feb 2020.

Vancouver:

Davies BR. Multi-Scale Films Inspired by Bone . [Internet] [Thesis]. University of Sydney; 2016. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/2123/15374.

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

Council of Science Editors:

Davies BR. Multi-Scale Films Inspired by Bone . [Thesis]. University of Sydney; 2016. Available from: http://hdl.handle.net/2123/15374

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

University of Windsor

16. Silva, Jorge. Fatigue Crack Growth in Steel used in Oil and Gas Pipelines.

Degree: MA, Civil and Environmental Engineering, 2011, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5391

► Oil and gas pipelines are subject to cyclic loads and can develop fatigue cracks. Particularly, pipes with longitudinal fatigue cracks are of utmost importance… (more)

Subjects/Keywords: Fatigue; fracture mechanics; pipe

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APA (6^th Edition):

Silva, J. (2011). Fatigue Crack Growth in Steel used in Oil and Gas Pipelines. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5391

Chicago Manual of Style (16^th Edition):

Silva, Jorge. “Fatigue Crack Growth in Steel used in Oil and Gas Pipelines.” 2011. Masters Thesis, University of Windsor. Accessed February 23, 2020. https://scholar.uwindsor.ca/etd/5391.

MLA Handbook (7^th Edition):

Silva, Jorge. “Fatigue Crack Growth in Steel used in Oil and Gas Pipelines.” 2011. Web. 23 Feb 2020.

Vancouver:

Silva J. Fatigue Crack Growth in Steel used in Oil and Gas Pipelines. [Internet] [Masters thesis]. University of Windsor; 2011. [cited 2020 Feb 23]. Available from: https://scholar.uwindsor.ca/etd/5391.

Council of Science Editors:

Silva J. Fatigue Crack Growth in Steel used in Oil and Gas Pipelines. [Masters Thesis]. University of Windsor; 2011. Available from: https://scholar.uwindsor.ca/etd/5391

Michigan State University

17. Sur, Ukhwan. A numerical method for the treatment of kinked cracks in finite bodies.

Degree: PhD, Department of Metallurgy, Mechanics, and Materials Science, 1987, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:35987

Subjects/Keywords: Fracture mechanics

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APA (6^th Edition):

Sur, U. (1987). A numerical method for the treatment of kinked cracks in finite bodies. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:35987

Chicago Manual of Style (16^th Edition):

Sur, Ukhwan. “A numerical method for the treatment of kinked cracks in finite bodies.” 1987. Doctoral Dissertation, Michigan State University. Accessed February 23, 2020. http://etd.lib.msu.edu/islandora/object/etd:35987.

MLA Handbook (7^th Edition):

Sur, Ukhwan. “A numerical method for the treatment of kinked cracks in finite bodies.” 1987. Web. 23 Feb 2020.

Vancouver:

Sur U. A numerical method for the treatment of kinked cracks in finite bodies. [Internet] [Doctoral dissertation]. Michigan State University; 1987. [cited 2020 Feb 23]. Available from: http://etd.lib.msu.edu/islandora/object/etd:35987.

Council of Science Editors:

Sur U. A numerical method for the treatment of kinked cracks in finite bodies. [Doctoral Dissertation]. Michigan State University; 1987. Available from: http://etd.lib.msu.edu/islandora/object/etd:35987

Universidad de Cantabria

18. Cicero González, Sergio. Evaluación de la integridad estructural de componentes sometidos a condiciones de bajo confinamiento.

Degree: 2007, Universidad de Cantabria

URL: http://hdl.handle.net/10902/1230

► RESUMEN: En esta Tesis Doctoral se analiza el fenómeno de la pérdida de confinamiento en el plano de aplicación de la carga de componentes industriales… (more)

Subjects/Keywords: Fracture mechanics

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APA (6^th Edition):

Cicero González, S. (2007). Evaluación de la integridad estructural de componentes sometidos a condiciones de bajo confinamiento. (Doctoral Dissertation). Universidad de Cantabria. Retrieved from http://hdl.handle.net/10902/1230

Chicago Manual of Style (16^th Edition):

Cicero González, Sergio. “Evaluación de la integridad estructural de componentes sometidos a condiciones de bajo confinamiento.” 2007. Doctoral Dissertation, Universidad de Cantabria. Accessed February 23, 2020. http://hdl.handle.net/10902/1230.

MLA Handbook (7^th Edition):

Cicero González, Sergio. “Evaluación de la integridad estructural de componentes sometidos a condiciones de bajo confinamiento.” 2007. Web. 23 Feb 2020.

Vancouver:

Cicero González S. Evaluación de la integridad estructural de componentes sometidos a condiciones de bajo confinamiento. [Internet] [Doctoral dissertation]. Universidad de Cantabria; 2007. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/10902/1230.

Council of Science Editors:

Cicero González S. Evaluación de la integridad estructural de componentes sometidos a condiciones de bajo confinamiento. [Doctoral Dissertation]. Universidad de Cantabria; 2007. Available from: http://hdl.handle.net/10902/1230

University of Aberdeen

19. Ajibose, Olusegun K. Nonlinear dynamics and contact fracture mechanics of high frequency percussive drilling.

Degree: 2009, University of Aberdeen

URL: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=61011 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521152

► The influence of three elastic contact models on the dynamics of the drilling module is studied by representing the percussive drilling process as a drifting… (more)

Subjects/Keywords: 621; Drilling technology : Fracture mechanics : Contact mechanics

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APA (6^th Edition):

Ajibose, O. K. (2009). Nonlinear dynamics and contact fracture mechanics of high frequency percussive drilling. (Doctoral Dissertation). University of Aberdeen. Retrieved from http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=61011 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521152

Chicago Manual of Style (16^th Edition):

Ajibose, Olusegun K. “Nonlinear dynamics and contact fracture mechanics of high frequency percussive drilling.” 2009. Doctoral Dissertation, University of Aberdeen. Accessed February 23, 2020. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=61011 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521152.

MLA Handbook (7^th Edition):

Ajibose, Olusegun K. “Nonlinear dynamics and contact fracture mechanics of high frequency percussive drilling.” 2009. Web. 23 Feb 2020.

Vancouver:

Ajibose OK. Nonlinear dynamics and contact fracture mechanics of high frequency percussive drilling. [Internet] [Doctoral dissertation]. University of Aberdeen; 2009. [cited 2020 Feb 23]. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=61011 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521152.

Council of Science Editors:

Ajibose OK. Nonlinear dynamics and contact fracture mechanics of high frequency percussive drilling. [Doctoral Dissertation]. University of Aberdeen; 2009. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=61011 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521152

University of Akron

20. Hamey, Cole S. Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces.

Degree: PhD, Civil Engineering, 2007, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157

► In this study, mechanics models for bi-layer beams suitable for bi-material interface characterization are introduced, and their application to mixed mode fracture of wood-FRP bonded… (more)

▼ In this study, mechanics models for bi-layer beams suitable for bi-material interface characterization are introduced, and their application to mixed mode fracture of wood-FRP bonded interface is studied. First, an engineering approach for evaluating the mixed-mode (Mode-I/II) fracture toughness of wood/FRP composite bonded interfaces is presented. Two four-point bending specimens, i.e., four-point asymmetric end-notched flexure (4-AENF) and four-point asymmetric mixed-mode bending (4-AMMB), are proposed for the study of the mixed-mode fracture. With proper design, the rate of compliance change with respect to crack length can be determined to be independent of the crack length for the specimens. The proposed specimens can be used to determine the mixed-mode fracture toughness without the need of measuring the crack propagation length. Mode decompositions are evaluated for each specimen, and with previously determined Mode-I and Mode-II data, a number of failure criteria and failure envelopes are determined for the wood-FRP interface. Second, an intuitive mechanics-based approach is presented to analyze layered beams using the split beam model, from which the layered beam is modeled as individual sub-beams and the stress acting throughout each sub-beam is used to determine the forces acting on the sub-beams. The split beam model is adapted to evaluate the compliance and ERR of three common groups of fracture specimens and loading conditions: Mode-I dominant (ADCB and DCB), Mode-II dominant (AENF and ENF), and Mixed-Mode (ASLB and SLB). It is demonstrated that the split beam model generates solutions consistent with those of existing specimens found in literature. Also, derived specimens are provided to allow for different ways of viewing the specimen configurations and possible ways of applying loads to achieve certain conditions. The compliance and ERR of two derived specimens are presented. The ERR for these two specimens is shown to be the same as the existing solutions, thus validating the accuracy of the approach. The simplified bi-layer models and related application to fracture of bi-material interface introduced in this study improve the data reduction techniques in fracture characterization and facilitate analysis and design of bi-material fracture specimens. Advisors/Committee Members: Qiao, Pizhong (Advisor), Binienda, Wieslaw (Advisor).

Subjects/Keywords: Engineering, Civil; Fracture Mechanics; LEFM; Interface Mechanics

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APA (6^th Edition):

Hamey, C. S. (2007). Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces. (Doctoral Dissertation). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157

Chicago Manual of Style (16^th Edition):

Hamey, Cole S. “Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces.” 2007. Doctoral Dissertation, University of Akron. Accessed February 23, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157.

MLA Handbook (7^th Edition):

Hamey, Cole S. “Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces.” 2007. Web. 23 Feb 2020.

Vancouver:

Hamey CS. Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces. [Internet] [Doctoral dissertation]. University of Akron; 2007. [cited 2020 Feb 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157.

Council of Science Editors:

Hamey CS. Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces. [Doctoral Dissertation]. University of Akron; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157

21. Alam, Mahabub. Crack Penetration and Deflection Behavior at Interfaces.

Degree: PhD, Mechanical Engineering, 2016, Oregon State University

URL: http://hdl.handle.net/1957/59907

► This study computationally and experimentally examines the mechanisms of crack penetration, deflection and the transition between penetration and deflection. The finite element analysis based computational… (more)

▼ This study computationally and experimentally examines the mechanisms of crack penetration, deflection and the transition between penetration and deflection. The finite element analysis based computational modeling work used strength-and-energy based cohesive-zone approach to study the effect of dimensionless parameters (e.g., interfacial incident angle, fracture-length scale, and normalized toughness) on penetration/deflection behavior for mode-I loading (tensile load normal to crack plane). The first modeling work examines the effect of incident angle between crack plane and interface for a crack incident on an interface. As expected, results exhibit that small incident angles cause deflection whereas penetration is more likely at large incident angles. The transition between penetration and deflection becomes more strength-ratio dependent as incident angle decreases. It appears that, facture-length scale is an influential parameter in crack deflection criterion and chances of deflection reduces as fracture-length-scale decreases. Finally, the analysis looked at the effect of normalized-toughness and found that the normalized-toughness has a small effect on deflection criteria. The second modeling work investigated the transition mechanism between deflection and penetration. The situation when both mode-I and mode-II works simultaneously is called mixed-mode, which is presented by the parameter phase angle. Phase angle 0° represents pure mode-I, 90° represents pure mode-II (shear load parallel to crack plane), and any phase angle in-between 0° and 90° represents mixed-mode. Results have shown the presence of smaller phase angle in the crack-tip at transition than deflection, while the applied load is elevated at transition due to providing the required energy for both the penetration and deflection. The difference of phase angles between transition and deflection becomes low as fracture-length-scale decreases. The results of cohesive-zone model meet Linear Elastic Fracture Mechanics (LEFM) results for the case of small fracture-length scales. This work analyzed interfacial phase angle during transition, between penetration and deflection, not only for homogeneous materials system but also for modulus mismatch. It was found that stiffer first-phase materials tend to create higher phase angle at the crack tip interfaces; the cases for low modulus mismatches are more sensitive than high modulus mismatches. A systematic experimental study was performed to compare results with the cohesive-zone method, LEFM, and strength-based method results. A brittle polymer Polymethyl methacrylate (PMMA) was used as substrate material, and two different kind of solvent adhesives Weld-On 4 and Weld-On 16 were used as interfaces that have similar elastic modulus as PMMA. The interfaces created by Weld-On 4 are weaker while Weld-On 16 creates stronger interfaces; however, they have similar toughness. Crack incident angle varied from 75° to 90° with 5° increment. Critical incident angle at transition between penetration and… Advisors/Committee Members: Parmigiani, John (advisor), Nairn, John (committee member).

Subjects/Keywords: Fracture mechanics; Fracture mechanics

…Linear Elastic Fracture Mechanics(LEFM), He and Hutchinson [17] predicted… …displacement showing the existence of an LEFM stress field at small values of material fracture… …to 90° at a fixed interface fracture length scale and fixed normalized toughness and a… …range of material fracture length scales (dashed lines)… …fracture of element three showing that elements corresponding to the lower-strength traction law…

11 more images…

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APA (6^th Edition):

Alam, M. (2016). Crack Penetration and Deflection Behavior at Interfaces. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/59907

Chicago Manual of Style (16^th Edition):

Alam, Mahabub. “Crack Penetration and Deflection Behavior at Interfaces.” 2016. Doctoral Dissertation, Oregon State University. Accessed February 23, 2020. http://hdl.handle.net/1957/59907.

MLA Handbook (7^th Edition):

Alam, Mahabub. “Crack Penetration and Deflection Behavior at Interfaces.” 2016. Web. 23 Feb 2020.

Vancouver:

Alam M. Crack Penetration and Deflection Behavior at Interfaces. [Internet] [Doctoral dissertation]. Oregon State University; 2016. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/1957/59907.

Council of Science Editors:

Alam M. Crack Penetration and Deflection Behavior at Interfaces. [Doctoral Dissertation]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59907

Columbia University

22. Mobasher, Mostafa. Enhanced continuum damage modeling of mechanical failure in ice and rocks.

Degree: 2017, Columbia University

URL: https://doi.org/10.7916/D85D94B8

► Modeling fracture in geomaterials is essential to the understanding of many physical phenomenon which may posses natural hazards e.g. landslides, faults and iceberg calving or… (more)

▼ Modeling fracture in geomaterials is essential to the understanding of many physical phenomenon which may posses natural hazards e.g. landslides, faults and iceberg calving or man-made processes e.g. hydraulic fracture and excavations. Continuum Damage Mechanics (CDM) models the crack as a solid region with a degraded stiffness. This continuum definition of cracks in CDM allows more feasible coupling with other forms of material non-linearity and eliminates the need to track complicated crack geometry. Using CDM to analyze fracture for the modeling of fracture in geomaterials encounters several challenges e.g.: 1) the need to model the multiple physical processes occurring in geomaterials, typically: coupled fluid flow and solid deformation, 2) the need to consider non-local damage and transport in order to capture the underlying long range interactions and achieve mesh-independent finite element solutions and 3) the elevated computational cost associated with non-linear mixed finite element formulations. The research presented in this thesis aims at improving the CDM formulations for modeling fracture geomaterials. This research can be divided into three main parts. The first is the introduction of a novel non-local damage transport formulation for modeling fracture in poroelastic media. The mathematical basis of the formulation are derived from thermodynamic equilibrium that considers non-local processes and homogenization principles. The non-local damage transport model leads to two additional regularization equations, one for non-local damage and the other for non-local transport which is reduced to non-local permeability. We consider two options for the implementation of the derived non-local transport damage model. The first option is the four-field formulation which extends the (u/P) formulation widely used in poroelasticity to include the non-local damage and transport phenomena. The second option is the three-field formulation, which is based on the coupling of the regularization equations under the assumptions of similar damage and permeability length scales and similar driving local stress/strain for the evolution of the damage and permeability. The three-field formulation is computationally cheaper but it degrades the physical modeling capabilities of the model. For each of these formulations, a non-linear mixed-finite element solution is developed and the Jacobian matrix is derived analytically. The developed formulations are used in the analysis of hydraulic fracture and consolidation examples. In the second part, a novel approach for CDM modeling of hydraulic fracture of glaciers is pretended. The presence of water-filled crevasses is known to increase the penetration depth of crevasses and this has been hypothesized to play an important role controlling iceberg calving rate. Here, we develop a continuum damage-based poro-mechanics formulation that enables the simulation of water-filled basal and/or surface crevasse propagation. The formulation incorporates a scalar isotropic damage…

Subjects/Keywords: Continuum damage mechanics – Mathematical models; Fracture mechanics; Rocks – Fracture

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APA (6^th Edition):

Mobasher, M. (2017). Enhanced continuum damage modeling of mechanical failure in ice and rocks. (Doctoral Dissertation). Columbia University. Retrieved from https://doi.org/10.7916/D85D94B8

Chicago Manual of Style (16^th Edition):

Mobasher, Mostafa. “Enhanced continuum damage modeling of mechanical failure in ice and rocks.” 2017. Doctoral Dissertation, Columbia University. Accessed February 23, 2020. https://doi.org/10.7916/D85D94B8.

MLA Handbook (7^th Edition):

Mobasher, Mostafa. “Enhanced continuum damage modeling of mechanical failure in ice and rocks.” 2017. Web. 23 Feb 2020.

Vancouver:

Mobasher M. Enhanced continuum damage modeling of mechanical failure in ice and rocks. [Internet] [Doctoral dissertation]. Columbia University; 2017. [cited 2020 Feb 23]. Available from: https://doi.org/10.7916/D85D94B8.

Council of Science Editors:

Mobasher M. Enhanced continuum damage modeling of mechanical failure in ice and rocks. [Doctoral Dissertation]. Columbia University; 2017. Available from: https://doi.org/10.7916/D85D94B8

The Ohio State University

23. El-Tahan, Wahba Wahba M. Fracture mechanics investigations of isotropic, jointed and bimodulus continua.

Degree: PhD, Graduate School, 1987, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612164002

Subjects/Keywords: Engineering; Fracture mechanics

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APA (6^th Edition):

El-Tahan, W. W. M. (1987). Fracture mechanics investigations of isotropic, jointed and bimodulus continua. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612164002

Chicago Manual of Style (16^th Edition):

El-Tahan, Wahba Wahba M. “Fracture mechanics investigations of isotropic, jointed and bimodulus continua.” 1987. Doctoral Dissertation, The Ohio State University. Accessed February 23, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612164002.

MLA Handbook (7^th Edition):

El-Tahan, Wahba Wahba M. “Fracture mechanics investigations of isotropic, jointed and bimodulus continua.” 1987. Web. 23 Feb 2020.

Vancouver:

El-Tahan WWM. Fracture mechanics investigations of isotropic, jointed and bimodulus continua. [Internet] [Doctoral dissertation]. The Ohio State University; 1987. [cited 2020 Feb 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612164002.

Council of Science Editors:

El-Tahan WWM. Fracture mechanics investigations of isotropic, jointed and bimodulus continua. [Doctoral Dissertation]. The Ohio State University; 1987. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612164002

The Ohio State University

24. Malik, Shah Nawaz Mohd. Elasto-plastic analysis for finite geometry cracked members by the method of lines.

Degree: PhD, Graduate School, 1979, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487084182545905

Subjects/Keywords: Education; Fracture mechanics

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APA (6^th Edition):

Malik, S. N. M. (1979). Elasto-plastic analysis for finite geometry cracked members by the method of lines. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1487084182545905

Chicago Manual of Style (16^th Edition):

Malik, Shah Nawaz Mohd. “Elasto-plastic analysis for finite geometry cracked members by the method of lines.” 1979. Doctoral Dissertation, The Ohio State University. Accessed February 23, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487084182545905.

MLA Handbook (7^th Edition):

Malik, Shah Nawaz Mohd. “Elasto-plastic analysis for finite geometry cracked members by the method of lines.” 1979. Web. 23 Feb 2020.

Vancouver:

Malik SNM. Elasto-plastic analysis for finite geometry cracked members by the method of lines. [Internet] [Doctoral dissertation]. The Ohio State University; 1979. [cited 2020 Feb 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487084182545905.

Council of Science Editors:

Malik SNM. Elasto-plastic analysis for finite geometry cracked members by the method of lines. [Doctoral Dissertation]. The Ohio State University; 1979. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487084182545905

Texas A&M University

25. Huang, Jian. Geomechanical Development of Fractured Reservoirs During Gas Production.

Degree: 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/149448

► Within fractured reservoirs, such as tight gas reservoir, coupled processes between matrix deformation and fluid flow are very important for predicting reservoir behavior, pore pressure… (more)

▼ Within fractured reservoirs, such as tight gas reservoir, coupled processes between matrix deformation and fluid flow are very important for predicting reservoir behavior, pore pressure evolution and fracture closure. To study the coupling between gas desorption and rock matrix/fracture deformation, a poroelastic constitutive relation is developed and used for deformation of gas shale. Local continuity equation of dry gas model is developed by considering the mass conservation of gas, including both free and absorbed phases. The absorbed gas content and the sorption-induced volumetric strain are described through a Langmiur-type equation. A general porosity model that differs from other empirical correlations in the literature is developed and utilized in a finite element model to coupled gas diffusion and rock mass deformation. The dual permeability method (DPM) is implemented into the Finite Element Model (FEM) to investigate fracture deformation and closure and its impact on gas flow in naturally fractured reservoir. Within the framework of DPM, the fractured reservoir is treated as dual continuum. Two independent but overlapping meshes (or elements) are used to represent these kinds of reservoirs: one is the matrix elements used for deformation and fluid flow within matrix domain; while the other is the fracture element simulating the fluid flow only through the fractures. Both matrix and fractures are assumed to be permeable and can accomodate fluid transported. A quasi steady-state function is used to quantify the flow that is transferred between rock mass and fractures. By implementing the idea of equivalent fracture permeability and shape-factor within the transfer function into DPM, the fracture geometry and orientation are numerically considered and the complexity of the problem is well reduced. Both the normal deformation and shear dilation of fractures are considered and the stress-dependent fracture aperture can be updated in time. Further, a non-linear numerical model is constructed by implementing a poroviscoelastic model into the dual permeability (DPM)-finite element model (FEM) to investigate the coupled time-dependent viscoelastic deformation, fracture network evolution and compressible fluid flow in gas shale reservoir. The viscoelastic effect is addressed in both deviatoric and symmetric effective stresses to emphasize the effect of shear strain localization on fracture shear dilation. The new mechanical model is first verified with an analytical solution in a simple wellbore creep problem and then compared with the poroelastic solution in both wellbore and field cases. Advisors/Committee Members: Ghassemi, Ahmad (advisor), Aubeny, Charles (committee member), Ayers, Walter (committee member), Holditch, Stephen (committee member), Schubert, Jerome (committee member).

Subjects/Keywords: gas shale; fracture mechanics; poroelasticity; poroviscoelasticity; creep

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APA (6^th Edition):

Huang, J. (2013). Geomechanical Development of Fractured Reservoirs During Gas Production. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149448

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):

Huang, Jian. “Geomechanical Development of Fractured Reservoirs During Gas Production.” 2013. Thesis, Texas A&M University. Accessed February 23, 2020. http://hdl.handle.net/1969.1/149448.

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

MLA Handbook (7^th Edition):

Huang, Jian. “Geomechanical Development of Fractured Reservoirs During Gas Production.” 2013. Web. 23 Feb 2020.

Vancouver:

Huang J. Geomechanical Development of Fractured Reservoirs During Gas Production. [Internet] [Thesis]. Texas A&M University; 2013. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/1969.1/149448.

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

Council of Science Editors:

Huang J. Geomechanical Development of Fractured Reservoirs During Gas Production. [Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149448

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

Anna University

26. Vijayakumar A. A study on fracture of components With short cracks using threshold Methods;.

Degree: A study on fracture of components With short cracks using threshold Methods, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/39884

►

The concept of defect tolerant design is perhaps the major newlinejustification for the use of fracture mechanics This concept accepts the newlinepossibility that an element… (more)

Subjects/Keywords: Linear Elastic Fracture Mechanics; Stress Intensity Factor

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APA (6^th Edition):

A, V. (2015). A study on fracture of components With short cracks using threshold Methods;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/39884

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):

A, Vijayakumar. “A study on fracture of components With short cracks using threshold Methods;.” 2015. Thesis, Anna University. Accessed February 23, 2020. http://shodhganga.inflibnet.ac.in/handle/10603/39884.

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

MLA Handbook (7^th Edition):

A, Vijayakumar. “A study on fracture of components With short cracks using threshold Methods;.” 2015. Web. 23 Feb 2020.

Vancouver:

A V. A study on fracture of components With short cracks using threshold Methods;. [Internet] [Thesis]. Anna University; 2015. [cited 2020 Feb 23]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/39884.

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

Council of Science Editors:

A V. A study on fracture of components With short cracks using threshold Methods;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/39884

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

University of Pretoria

27. De Klerk, Antoinette. Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems.

Degree: Mechanical and Aeronautical Engineering, 2007, University of Pretoria

URL: http://hdl.handle.net/2263/23983

► This thesis deals with the solution of linear elastic fracture mechanics problems. To solve the linear elastic fracture mechanics problems, the finite element method and… (more)

▼ This thesis deals with the solution of linear elastic fracture mechanics problems. To solve the linear elastic fracture mechanics problems, the finite element method and path independent integrals are employed, namely Rice's J integral and an alternative path independent integral I *, which is the energy complement to J. Stress intensity factors for typical mode I and mode II fracture mechanics problems in isotropic and orthotropic elastic plates are calculated. The problems considered are a center cracked panel subjected to uniform tension, a single edge cracked panel subjected to uniform tension, a double edge cracked panel subjected to uniform tension, and a center cracked panel subjected to uniform shear. Firstly, classical displacement based finite elements, elements with penalized equilibrium and elements with drilling degrees of freedom are presented and implemented in a MATLAB environment. Secondly, two different ways to evaluate the stress intensity factor are considered, namely the displacement extrapolation approach, and the path independent integrals J and I *. The numerical implementation and path independence of the J and I * integral is demonstrated. It is shown that the J integral can estimate the lower bound of the stress intensity factor when used with displacement based finite elements, while the I * integral can estimate the upper bound of the stress intensity factor, when used with stress equilibrium elements. Thirdly, the path independent integrals J and I * are applied to isotropic fracture mechanics problems to determine the stress intensity factor at the tip of a crack. Convergence studies are presented to investigate the influence of mesh refinement on the stress intensity factor predicted using the J and I * integral. The path independence of J and I * are investigated. Numerical results for typical fracture specimens are presented and discussed. Finally, the path independent integrals J and I * are applied to orthotropic fracture mechanics problems to determine the stress intensity factor at the crack tip. Again, convergence studies are done, and the path independence of J and I * are investigated for orthotropic problems. Numerical results for typical fracture specimens are presented and discussed. The effect of the degree of anisotropy and fiber orientation on the stress intensity factor is also demonstrated. A novel contribution in this thesis are the results for elements with drilling degrees of freedom in fracture mechanics problems. In addition, the results presented here may serve to clarify published stress intensity factor results for orthotropic materials presented in the literature, since many of the results previously presented are contradictory. Advisors/Committee Members: Prof A A Groenwold (advisor), Mnr A G Visser (advisor), Dr R K L Su (advisor).

Subjects/Keywords: Fracture mechanics; UCTD

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

APA (6^th Edition):

De Klerk, A. (2007). Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/23983

Chicago Manual of Style (16^th Edition):

De Klerk, Antoinette. “Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems.” 2007. Masters Thesis, University of Pretoria. Accessed February 23, 2020. http://hdl.handle.net/2263/23983.

MLA Handbook (7^th Edition):

De Klerk, Antoinette. “Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems.” 2007. Web. 23 Feb 2020.

Vancouver:

De Klerk A. Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems. [Internet] [Masters thesis]. University of Pretoria; 2007. [cited 2020 Feb 23]. Available from: http://hdl.handle.net/2263/23983.

Council of Science Editors:

De Klerk A. Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems. [Masters Thesis]. University of Pretoria; 2007. Available from: http://hdl.handle.net/2263/23983

University of Pretoria

28. [No author]. Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems .

Degree: 2007, University of Pretoria

URL: http://upetd.up.ac.za/thesis/available/etd-04172007-115809/

► This thesis deals with the solution of linear elastic fracture mechanics problems. To solve the linear elastic fracture mechanics problems, the finite element method and… (more)

▼ This thesis deals with the solution of linear elastic fracture mechanics problems. To solve the linear elastic fracture mechanics problems, the finite element method and path independent integrals are employed, namely Rice's J integral and an alternative path independent integral I *, which is the energy complement to J. Stress intensity factors for typical mode I and mode II fracture mechanics problems in isotropic and orthotropic elastic plates are calculated. The problems considered are a center cracked panel subjected to uniform tension, a single edge cracked panel subjected to uniform tension, a double edge cracked panel subjected to uniform tension, and a center cracked panel subjected to uniform shear. Firstly, classical displacement based finite elements, elements with penalized equilibrium and elements with drilling degrees of freedom are presented and implemented in a MATLAB environment. Secondly, two different ways to evaluate the stress intensity factor are considered, namely the displacement extrapolation approach, and the path independent integrals J and I *. The numerical implementation and path independence of the J and I * integral is demonstrated. It is shown that the J integral can estimate the lower bound of the stress intensity factor when used with displacement based finite elements, while the I * integral can estimate the upper bound of the stress intensity factor, when used with stress equilibrium elements. Thirdly, the path independent integrals J and I * are applied to isotropic fracture mechanics problems to determine the stress intensity factor at the tip of a crack. Convergence studies are presented to investigate the influence of mesh refinement on the stress intensity factor predicted using the J and I * integral. The path independence of J and I * are investigated. Numerical results for typical fracture specimens are presented and discussed. Finally, the path independent integrals J and I * are applied to orthotropic fracture mechanics problems to determine the stress intensity factor at the crack tip. Again, convergence studies are done, and the path independence of J and I * are investigated for orthotropic problems. Numerical results for typical fracture specimens are presented and discussed. The effect of the degree of anisotropy and fiber orientation on the stress intensity factor is also demonstrated. A novel contribution in this thesis are the results for elements with drilling degrees of freedom in fracture mechanics problems. In addition, the results presented here may serve to clarify published stress intensity factor results for orthotropic materials presented in the literature, since many of the results previously presented are contradictory. Advisors/Committee Members: Prof A A Groenwold (advisor), Mnr A G Visser (advisor), Dr R K L Su (advisor).

Subjects/Keywords: Fracture mechanics; UCTD

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APA (6^th Edition):

author], [. (2007). Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems . (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-04172007-115809/

Chicago Manual of Style (16^th Edition):

author], [No. “Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems .” 2007. Masters Thesis, University of Pretoria. Accessed February 23, 2020. http://upetd.up.ac.za/thesis/available/etd-04172007-115809/.

MLA Handbook (7^th Edition):

author], [No. “Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems .” 2007. Web. 23 Feb 2020.

Vancouver:

author] [. Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems . [Internet] [Masters thesis]. University of Pretoria; 2007. [cited 2020 Feb 23]. Available from: http://upetd.up.ac.za/thesis/available/etd-04172007-115809/.

Council of Science Editors:

author] [. Elements with penalized equilibrium and rotational degrees of freedom in fracture mechanics problems . [Masters Thesis]. University of Pretoria; 2007. Available from: http://upetd.up.ac.za/thesis/available/etd-04172007-115809/

Penn State University

29. Pitt, Jonathan S. A Brittle Damage Model in Thermoelastodynamics.

Degree: PhD, Engineering Science and Mechanics, 2009, Penn State University

URL: https://etda.libraries.psu.edu/catalog/9349

► The response of brittle materials subjected to dynamic thermomechanical loading is investigated. In particular, simulations are used to determine the role of material property dependence… (more)

▼ The response of brittle materials subjected to dynamic thermomechanical loading is investigated. In particular, simulations are used to determine the role of material property dependence on the microstructure of a brittle material, and to determine the viability of modeling thermal phenomena associated with brittle failure within the framework of continuum damage mechanics (CDM). A system of equations is derived via the theory of internal state variables that ful ly couples the elastic, thermal, and microstructure evolution of a thermoelastic material with isotropic damage. Dynamic eﬀects in the equations of motion and the intrinsically local nature of the constitutive equations are carefully studied. A new implementation of the ﬁnite element method is proposed for ﬁnding approximate solutions to the derived model. The damage variable is treated as a ﬁeld, as opposed to the common method of considering values of the damage at the quadrature points. In this way, the damage is treated in the general framework of ﬁnite element methods. A key element of the proposed numerical formulation is the use of a piecewise constant approximate solution space for the damage variable. This is physically motivated; not only is the damage variable local, it is most often the result of homogenization over a representative volume element, and therefore evolves in a piecewise constant manner according to the mesh. Adaptive mesh reﬁnement is implemented to keep the size of higher dimensional problems reasonable, and also to properly resolve the morphology of the damage ﬁeld. Brittle behavior is captured by deﬁning a minimum mesh size and allowing the damage variable to grow rapidly, as is physically the case in fracture. Failure induced thermal heating is observed in the simulations. To the author’s knowledge, this is the ﬁrst presentation of such a result in the context of CDM for brittle materials. The speciﬁc heat and its dependence on the damage vari- able/microstructure were found to play an extremely important role in this heating. Therefore, further study (both theoretical and experimental) of the eﬀects of failure mechanisms on the speciﬁc heat appear to be particularly important to better understand the failure of brittle materials subjected to thermomechanical loading. Speciﬁc issues in the modeling of an intrinsically discontinuous phenomena like fracture within a continuous theory are discussed.

Subjects/Keywords: Finite Element Method; Fracture; Continuum Damage Mechanics

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

APA (6^th Edition):

Pitt, J. S. (2009). A Brittle Damage Model in Thermoelastodynamics. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/9349

Chicago Manual of Style (16^th Edition):

Pitt, Jonathan S. “A Brittle Damage Model in Thermoelastodynamics.” 2009. Doctoral Dissertation, Penn State University. Accessed February 23, 2020. https://etda.libraries.psu.edu/catalog/9349.

MLA Handbook (7^th Edition):

Pitt, Jonathan S. “A Brittle Damage Model in Thermoelastodynamics.” 2009. Web. 23 Feb 2020.

Vancouver:

Pitt JS. A Brittle Damage Model in Thermoelastodynamics. [Internet] [Doctoral dissertation]. Penn State University; 2009. [cited 2020 Feb 23]. Available from: https://etda.libraries.psu.edu/catalog/9349.

Council of Science Editors:

Pitt JS. A Brittle Damage Model in Thermoelastodynamics. [Doctoral Dissertation]. Penn State University; 2009. Available from: https://etda.libraries.psu.edu/catalog/9349

Penn State University

30. Kumar, Sandeep. Fracture mechanics of nanoscale thin films.

Degree: PhD, Mechanical Engineering, 2012, Penn State University

URL: https://etda.libraries.psu.edu/catalog/15164

► Thin films are prevalently used in micro-electronics, data storage, sensors and actuators, energy conversion and micro-electro-mechanical systems, where they experience mechanical and thermal loading during… (more)

▼ Thin films are prevalently used in micro-electronics, data storage, sensors and actuators, energy conversion and micro-electro-mechanical systems, where they experience mechanical and thermal loading during device fabrication and operation. Fundamental understanding of the mechanics of deformation and fracture of thin films is therefore important from device design and reliability perspectives. This thesis pursues an experimental approach to understand deformation behavior of nanoscale thin films. A micro electro mechanical system (MEMS) based device has been developed to carry out fracture testing of metallic and multilayer thin films in-situ inside the transmission electron microscope (TEM). Nanofabrication techniques are utilized to fabricate a bent beam thermal actuator device integrated with notched fracture testing specimens. The experimental results suggest significant deviation from classical relationship between grain size and underlying deformation mechanism. A key contribution of this research is the size effect on stress concentration. Typically, geometrically necessary dislocations result in strain gradient at the notch tip. However, our in-situ selected area electron diffraction (SAED) studies clearly show the absence of any strain gradient at the notch tip. To explain this anomalous observation, we propose that when the grain size is below a critical size (for aluminum ~ 60 nm), dislocation based plasticity mechanisms are replaced by grain rotation, which homogenize the strain field. In the absence of strain (or stress) concentration, the material becomes flaw tolerant. This behavior is similar to behavior shown by naturally occurring biomaterials. We repeated the experiments on Platinum thin films with grain size favorable for dislocation based mechanics to support our hypothesis. Pure metals do not exhibit solid-solid phase transformation since they deform and fail far below the theoretically required stress levels that exceed hundreds of GPa. A key contribution of this research is to show experimentally that by controlling grain size and thickness, classical deformation modes can be suppressed to induce phase transformation in pure metal films at stresses few orders of magnitude lower than theoretical values. For the first time, we present in-situ transmission electron diffraction evidence of face-centered cubic (FCC) to hexagonal ω phase transformation in 99.99% pure nanocrystalline aluminum at room temperature and only 2.5 GPa of tensile stress. For 60 nm average grain size, the aluminum films did not show any appreciable diffusion-based processes such as grain growth, rotation and sliding. Facilitated by the absence of dislocation and diffusion based processes, the uniaxial nature of specimen loading results in phase transformation at stresses two orders of magnitude lower than that predicted for aluminum. We propose that in absence of dislocations and grain rotation, phase transformation could be the only way to relax the high strain energy at the notch tip without initiating failure, which can…

Subjects/Keywords: Thin films; TEM; Fracture; mechanics; nanoscale

Record Details Similar Records Cite « Share

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

APA (6^th Edition):

Kumar, S. (2012). Fracture mechanics of nanoscale thin films. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/15164

Chicago Manual of Style (16^th Edition):

Kumar, Sandeep. “Fracture mechanics of nanoscale thin films.” 2012. Doctoral Dissertation, Penn State University. Accessed February 23, 2020. https://etda.libraries.psu.edu/catalog/15164.

MLA Handbook (7^th Edition):

Kumar, Sandeep. “Fracture mechanics of nanoscale thin films.” 2012. Web. 23 Feb 2020.

Vancouver:

Kumar S. Fracture mechanics of nanoscale thin films. [Internet] [Doctoral dissertation]. Penn State University; 2012. [cited 2020 Feb 23]. Available from: https://etda.libraries.psu.edu/catalog/15164.

Council of Science Editors:

Kumar S. Fracture mechanics of nanoscale thin films. [Doctoral Dissertation]. Penn State University; 2012. Available from: https://etda.libraries.psu.edu/catalog/15164

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