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George Mason University
1.
Garrity, Michael J.
Computational Membrane Model Using Finite Element Method for Flexible-Wing Based Micro Air Vehicles
.
Degree: 2011, George Mason University
URL: http://hdl.handle.net/1920/6605 
► Current designs for Micro Air Vehicles (MAVs) consist of a flexible wing with rigid battens for support. This paper analyzes the development and evaluation of…
(more)
▼ Current designs for Micro Air Vehicles (MAVs) consist of a flexible wing with rigid battens for support. This paper analyzes the development and evaluation of strain on the membrane from various constitutive models used for the flexible-wing-based MAVs. A dependable accurate prediction of its aerodynamic performance requires efficient modeling techniques. In this work, a new C++ code has been developed to simulate the computational membrane methodology described in this thesis. Our computational model of the membrane incorporates a finite element analysis that uses Principle of Virtual Work. We develop and implement a computational algorithm to understand the mechanics of a thin “rubber-like” membrane material of the wing. We also study the performance of the method with different constitutive models. The overall objective in our model is to solve for the deflection of the deformed membrane.
Advisors/Committee Members: Seshaiyer, Padmanabhan (advisor).
Subjects/Keywords: Membrane;
MAV;
Flexible;
Hyperelasticity;
Model;
C++
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APA (6th Edition):
Garrity, M. J. (2011). Computational Membrane Model Using Finite Element Method for Flexible-Wing Based Micro Air Vehicles
. (Thesis). George Mason University. Retrieved from http://hdl.handle.net/1920/6605
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Garrity, Michael J. “Computational Membrane Model Using Finite Element Method for Flexible-Wing Based Micro Air Vehicles
.” 2011. Thesis, George Mason University. Accessed October 17, 2019.
http://hdl.handle.net/1920/6605.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Garrity, Michael J. “Computational Membrane Model Using Finite Element Method for Flexible-Wing Based Micro Air Vehicles
.” 2011. Web. 17 Oct 2019.
Vancouver:
Garrity MJ. Computational Membrane Model Using Finite Element Method for Flexible-Wing Based Micro Air Vehicles
. [Internet] [Thesis]. George Mason University; 2011. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/1920/6605.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Garrity MJ. Computational Membrane Model Using Finite Element Method for Flexible-Wing Based Micro Air Vehicles
. [Thesis]. George Mason University; 2011. Available from: http://hdl.handle.net/1920/6605
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Chen, Zhuo-Wei.
Simulation numérique du comportement dynamique des organes pelviens : Numerical simulation of dynamic behavior of pelvic organs.
Degree: Docteur es, Mécanique, 2013, Evry-Val d'Essonne
URL: http://www.theses.fr/2013EVRY0009
► Le prolapsus des organes pelviens (vessie, rectum, utérus, vagin) est un problème de santé qui touche de plus en plus de femmes. Ce trouble, dont…
(more)
▼ Le prolapsus des organes pelviens (vessie, rectum, utérus, vagin) est un problème de santé qui touche de plus en plus de femmes. Ce trouble, dont la fréquence augmente avec le vieillissement de la population, altère inévitablement la qualité de vie des malades. Pour autant, les causes de cette pathologie sont mal connues et les pratiques chirurgicales demeurent mal évaluées. La réalisation d’un simulateur du comportement dynamique des organes pelviens permettant au chirurgien d’estimer l’impact fonctionnel de son geste avant sa réalisation est donc un besoin identifié. Ce travail concerne ainsi le développement, par la méthode des éléments finis, d’un modèle numérique du mouvement des organes pelviens et de leurs interactions. Un modèle est construit à partir d’une segmentation de l’IRM des patiente, permettant de générer la géométrie des organes pelviens. Des lois hyperélastiques sont ensuite adoptées pour modéliser le comportement mécanique des organes. Des résultats qualitatifs sont obtenus, permettant de comprendre les causes de certaines formes de prolapsus et d’estimer l’effet virtuel des interactions entre les organes.
Pelvic organ prolapse is a health problem that occurs only in women and becomes more common. These disorders whose frequency increases with the aging of the population affect the patients’ quality of life. However, the causes of these diseases are poorly understood and the surgical practices remain poorly evaluated. The realization of a simulator will allow surgeon to estimate the functional impact of his actions before implementation, to perform the surgery in a more controlled and reliable way. This work concerns the development of a numerical model of pelvic organs’ movement and their interactions based on the finite element methods. A first model is constructed from patients MRI images, allowing the generation of the organ geometries. Hyperelastic modeling of the organs behaviors were considered. Qualitative results could help to understand the reasons for the prolapse and to estimate the potential effect of organs interactions.
Advisors/Committee Members: Feng, Zhi-Qiang (thesis director), Joli, Pierre (thesis director).
Subjects/Keywords: Hyperélasticité; Hyperelasticity; Pelvic organs; Soft tissue
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APA (6th Edition):
Chen, Z. (2013). Simulation numérique du comportement dynamique des organes pelviens : Numerical simulation of dynamic behavior of pelvic organs. (Doctoral Dissertation). Evry-Val d'Essonne. Retrieved from http://www.theses.fr/2013EVRY0009
Chicago Manual of Style (16th Edition):
Chen, Zhuo-Wei. “Simulation numérique du comportement dynamique des organes pelviens : Numerical simulation of dynamic behavior of pelvic organs.” 2013. Doctoral Dissertation, Evry-Val d'Essonne. Accessed October 17, 2019.
http://www.theses.fr/2013EVRY0009.
MLA Handbook (7th Edition):
Chen, Zhuo-Wei. “Simulation numérique du comportement dynamique des organes pelviens : Numerical simulation of dynamic behavior of pelvic organs.” 2013. Web. 17 Oct 2019.
Vancouver:
Chen Z. Simulation numérique du comportement dynamique des organes pelviens : Numerical simulation of dynamic behavior of pelvic organs. [Internet] [Doctoral dissertation]. Evry-Val d'Essonne; 2013. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2013EVRY0009.
Council of Science Editors:
Chen Z. Simulation numérique du comportement dynamique des organes pelviens : Numerical simulation of dynamic behavior of pelvic organs. [Doctoral Dissertation]. Evry-Val d'Essonne; 2013. Available from: http://www.theses.fr/2013EVRY0009
Indian Institute of Science
3.
Patil, Kunal D.
Geometric And Material Stability Criteria For Material Models In Hyperelasticity.
Degree: 2011, Indian Institute of Science
URL: http://hdl.handle.net/2005/2120
► In the literature, there are various material models proposed so as to model the constitutive behavior of hyperelastic materials for example, St. Venant-Kirchho_ model, Mooney-Rivlin…
(more)
▼ In the literature, there are various material models proposed so as to model the constitutive behavior of hyperelastic materials for example, St. Venant-Kirchho_ model, Mooney-Rivlin model etc. The stability of such material models under various states of deformation is of important concern, and generally stability analysis is conducted in homogeneous states of deformation. Within
hyperelasticity, instabilities can be broadly classified as geometrical and material types.
Geometrical instabilities such as buckling, symmetric bifurcation etc. are of physical origin, and lead to multiple solutions at critical stretch. Material instability is a aw in the material model and leads to unphysical solutions at the onset. It is required that the constitutive model should be materially stable i.e., should not give unphysical results, and be able to predict correctly the onset of geometrical instabilities. Certain constitutive restrictions proposed in the literature
are inadequate to characterize such instabilities.
In the work, we propose stability criteria which will characterize geometrical
as well as material instabilities. A new elasticity tensor is defined, which is found to characterize material instability adequately. In order to investigate the validity of proposed stability criteria, three important constitutive models of
hyperelasticity viz., St. Venant-Kirchho_, compressible Mooney-Rivlin and compressible
Ogden models are investigated for stability.
Advisors/Committee Members: Jog, C S.
Subjects/Keywords: Hyperelasticity; Deformation Theory; Material Instability; Finite Deformation; Hyperelasticity - Material Models; Material Models; Geometric Instability; Finite Deformation Theory; Hyperelastic Materials; Materials Science
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APA ·
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APA (6th Edition):
Patil, K. D. (2011). Geometric And Material Stability Criteria For Material Models In Hyperelasticity. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2120
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Patil, Kunal D. “Geometric And Material Stability Criteria For Material Models In Hyperelasticity.” 2011. Thesis, Indian Institute of Science. Accessed October 17, 2019.
http://hdl.handle.net/2005/2120.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Patil, Kunal D. “Geometric And Material Stability Criteria For Material Models In Hyperelasticity.” 2011. Web. 17 Oct 2019.
Vancouver:
Patil KD. Geometric And Material Stability Criteria For Material Models In Hyperelasticity. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/2005/2120.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Patil KD. Geometric And Material Stability Criteria For Material Models In Hyperelasticity. [Thesis]. Indian Institute of Science; 2011. Available from: http://hdl.handle.net/2005/2120
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
4.
Patil, Kunal D.
Geometric And Material Stability Criteria For Material Models In Hyperelasticity.
Degree: 2011, Indian Institute of Science
URL: http://etd.iisc.ernet.in/handle/2005/2120
;
http://etd.ncsi.iisc.ernet.in/abstracts/2724/G24947-Abs.pdf
► In the literature, there are various material models proposed so as to model the constitutive behavior of hyperelastic materials for example, St. Venant-Kirchho_ model, Mooney-Rivlin…
(more)
▼ In the literature, there are various material models proposed so as to model the constitutive behavior of hyperelastic materials for example, St. Venant-Kirchho_ model, Mooney-Rivlin model etc. The stability of such material models under various states of deformation is of important concern, and generally stability analysis is conducted in homogeneous states of deformation. Within
hyperelasticity, instabilities can be broadly classified as geometrical and material types.
Geometrical instabilities such as buckling, symmetric bifurcation etc. are of physical origin, and lead to multiple solutions at critical stretch. Material instability is a aw in the material model and leads to unphysical solutions at the onset. It is required that the constitutive model should be materially stable i.e., should not give unphysical results, and be able to predict correctly the onset of geometrical instabilities. Certain constitutive restrictions proposed in the literature
are inadequate to characterize such instabilities.
In the work, we propose stability criteria which will characterize geometrical
as well as material instabilities. A new elasticity tensor is defined, which is found to characterize material instability adequately. In order to investigate the validity of proposed stability criteria, three important constitutive models of
hyperelasticity viz., St. Venant-Kirchho_, compressible Mooney-Rivlin and compressible
Ogden models are investigated for stability.
Advisors/Committee Members: Jog, C S.
Subjects/Keywords: Hyperelasticity; Deformation Theory; Material Instability; Finite Deformation; Hyperelasticity - Material Models; Material Models; Geometric Instability; Finite Deformation Theory; Hyperelastic Materials; Materials Science
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Patil, K. D. (2011). Geometric And Material Stability Criteria For Material Models In Hyperelasticity. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/2120 ; http://etd.ncsi.iisc.ernet.in/abstracts/2724/G24947-Abs.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Patil, Kunal D. “Geometric And Material Stability Criteria For Material Models In Hyperelasticity.” 2011. Thesis, Indian Institute of Science. Accessed October 17, 2019.
http://etd.iisc.ernet.in/handle/2005/2120 ; http://etd.ncsi.iisc.ernet.in/abstracts/2724/G24947-Abs.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Patil, Kunal D. “Geometric And Material Stability Criteria For Material Models In Hyperelasticity.” 2011. Web. 17 Oct 2019.
Vancouver:
Patil KD. Geometric And Material Stability Criteria For Material Models In Hyperelasticity. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Oct 17].
Available from: http://etd.iisc.ernet.in/handle/2005/2120 ; http://etd.ncsi.iisc.ernet.in/abstracts/2724/G24947-Abs.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Patil KD. Geometric And Material Stability Criteria For Material Models In Hyperelasticity. [Thesis]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ernet.in/handle/2005/2120 ; http://etd.ncsi.iisc.ernet.in/abstracts/2724/G24947-Abs.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brno University of Technology
5.
Burdík, Martin.
Výpočtové modelování tlumiče rázů z plastických a hyperelastických materiálů
.
Degree: 2009, Brno University of Technology
URL: http://hdl.handle.net/11012/8769
► Cílem předložené práce je vytvoření výpočtového modelu napěťově deformačního chování tlumičů rázů z hyperelastických a plastických materiálů. Prvním krokem je seznámení se z teorií velkých…
(more)
▼ Cílem předložené práce je vytvoření výpočtového modelu napěťově deformačního chování tlumičů rázů z hyperelastických a plastických materiálů. Prvním krokem je seznámení se z teorií velkých deformací, teoretickými poznatky o hyperelastických a plastických materiálech. Dalším krokem je seznámení se s možnostmi komerčních systémů MKP při řešení problému hyperelastických a plastických materiálů. Na základě zjištěných poznatků jsou vytvořeny modely jednoduchých tlumičů rázu a s těmito modely jsou simulovány rázové děje. Srovnání je provedeno na základě průběhů zrychlení tělesa, které do tělesa narazí z danou počáteční rychlostí.; An aim of the given thesis is creating of a computational model of strain-stress behaviour of shock absorbers made of plastic and hyperelastic material. First step is get ecquaint with theory of large strains, theory of
hyperelasticity and plasticity. Next step is get ecquaint with options of commercial programs based on MKP. Based on this knowledge, models of simple shock absorber are made. With created models, crash tests are simulated and property of shock absorbers are compared.
Advisors/Committee Members: Burša, Jiří (advisor).
Subjects/Keywords: tlumič rázu;
hyperelasticity;
plasticity;
Shock absorber;
hyperelasticity;
plasticity
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Burdík, M. (2009). Výpočtové modelování tlumiče rázů z plastických a hyperelastických materiálů
. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/8769
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Burdík, Martin. “Výpočtové modelování tlumiče rázů z plastických a hyperelastických materiálů
.” 2009. Thesis, Brno University of Technology. Accessed October 17, 2019.
http://hdl.handle.net/11012/8769.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Burdík, Martin. “Výpočtové modelování tlumiče rázů z plastických a hyperelastických materiálů
.” 2009. Web. 17 Oct 2019.
Vancouver:
Burdík M. Výpočtové modelování tlumiče rázů z plastických a hyperelastických materiálů
. [Internet] [Thesis]. Brno University of Technology; 2009. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/11012/8769.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Burdík M. Výpočtové modelování tlumiče rázů z plastických a hyperelastických materiálů
. [Thesis]. Brno University of Technology; 2009. Available from: http://hdl.handle.net/11012/8769
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Western Ontario
6.
Gillani, Asim.
Development Of Material Model Subroutines For Linear And Nonlinear Response Of Elastomers.
Degree: 2018, University of Western Ontario
URL: https://ir.lib.uwo.ca/etd/5837
► The nature of elastomers has been extensively studied ever since the vulcanization of rubber in the 19th century. Elastomers have been heavily employed in various…
(more)
▼ The nature of elastomers has been extensively studied ever since the vulcanization of rubber in the 19th century. Elastomers have been heavily employed in various fields, such as automobile, aerospace, robotics, biomimetics, dynamics and energy harvesting. Due to their molecular nature, these materials display hyperelastic and viscous response when deformed. Their response has been studied in a number of works, which tend to explain their nature through the theory of polymer dynamics or using rheological models. As elastomers are designed as actuators, generators or artificial tissues with complex geometries, the need for finite element analysis to study their response is becoming more essential. The purpose of this study is to develop user defined subroutines (UMATs) to capture the viscoelastic and hyperelastic response of elastomeric materials in ABAQUS CAE. Two UMATs have been formulated based on the existing theory of linear viscoelasticity and hyperelasticity. The developed UMATs are then tested using ABAQUS CAE software on their accuracy, robustness and versatility. The UMAT for predicting the linear response of elastomers can capture the time and rate-dependent response of material. However, it showed some offset from experimental results since the material is nonlinear in nature. The UMAT for predicting the nonlinear behavior of elastomers quite accurately capture the hyperelastic response of the material.
Subjects/Keywords: Elastomers; Viscoelasticity; hyperelasticity; user material subroutines; finite element simulation.; Applied Mechanics
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APA ·
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APA (6th Edition):
Gillani, A. (2018). Development Of Material Model Subroutines For Linear And Nonlinear Response Of Elastomers. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/5837
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gillani, Asim. “Development Of Material Model Subroutines For Linear And Nonlinear Response Of Elastomers.” 2018. Thesis, University of Western Ontario. Accessed October 17, 2019.
https://ir.lib.uwo.ca/etd/5837.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gillani, Asim. “Development Of Material Model Subroutines For Linear And Nonlinear Response Of Elastomers.” 2018. Web. 17 Oct 2019.
Vancouver:
Gillani A. Development Of Material Model Subroutines For Linear And Nonlinear Response Of Elastomers. [Internet] [Thesis]. University of Western Ontario; 2018. [cited 2019 Oct 17].
Available from: https://ir.lib.uwo.ca/etd/5837.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gillani A. Development Of Material Model Subroutines For Linear And Nonlinear Response Of Elastomers. [Thesis]. University of Western Ontario; 2018. Available from: https://ir.lib.uwo.ca/etd/5837
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Saskatchewan
7.
St. Jean, Simon.
Applications of symmetries and conservation laws to the study of nonlinear elasticity equations.
Degree: 2014, University of Saskatchewan
URL: http://hdl.handle.net/10388/ETD-2015-05-1773
► Mooney-Rivlin hyperelasticity equations are nonlinear coupled partial differential equations (PDEs) that are used to model various elastic materials. These models have been extended to account…
(more)
▼ Mooney-Rivlin
hyperelasticity equations are nonlinear coupled partial differential equations (PDEs) that are used to model various elastic materials. These models have been extended to account for fiber reinforced solids with applications in modeling biological materials. As such, it is important to obtain solutions to these physical systems. One approach is to study the admitted Lie symmetries of the PDE system, which allows one to seek invariant solutions by the invariant form method. Furthermore, knowledge of conservation laws for a PDE provides insight into conserved physical quantities, and can be used in the development of stable numerical methods.
The current Thesis is dedicated to presenting the methodology of Lie symmetry and conservation law analysis, as well as applying it to fiber reinforced Mooney-Rivlin models. In particular, an outline of Lie symmetry and conservation law analysis is provided, and the partial differential equations describing the dynamics of a hyperelastic solid are presented. A detailed example of Lie symmetry and conservation law analysis is done for the PDE system describing plane strain in a Mooney-Rivlin solid. Lastly, Lie symmetries and conservation laws are studied in one and two dimensional models of fiber reinforced Mooney-Rivlin materials.
Advisors/Committee Members: Shevyakov, Alexey F., Sowa, Artur P., Wang, Jiun-Chau.
Subjects/Keywords: Applied Mathematics; Conservation Law; Differential Equations; Elasticity; Hyperelasticity; Lie Symmetry Analysis
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APA ·
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APA (6th Edition):
St. Jean, S. (2014). Applications of symmetries and conservation laws to the study of nonlinear elasticity equations. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2015-05-1773
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
St. Jean, Simon. “Applications of symmetries and conservation laws to the study of nonlinear elasticity equations.” 2014. Thesis, University of Saskatchewan. Accessed October 17, 2019.
http://hdl.handle.net/10388/ETD-2015-05-1773.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
St. Jean, Simon. “Applications of symmetries and conservation laws to the study of nonlinear elasticity equations.” 2014. Web. 17 Oct 2019.
Vancouver:
St. Jean S. Applications of symmetries and conservation laws to the study of nonlinear elasticity equations. [Internet] [Thesis]. University of Saskatchewan; 2014. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/10388/ETD-2015-05-1773.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
St. Jean S. Applications of symmetries and conservation laws to the study of nonlinear elasticity equations. [Thesis]. University of Saskatchewan; 2014. Available from: http://hdl.handle.net/10388/ETD-2015-05-1773
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Louisiana State University
8.
Samadidooki, Aref.
Experimental, Analytical, and Numerical Evaluation of the Mechanical Properties of the Brain Tissue.
Degree: PhD, Applied Mechanics, 2018, Louisiana State University
URL: https://digitalcommons.lsu.edu/gradschool_dissertations/4622
► A true understanding of the mechanisms behind most of the brain diseases is still out of reach. For several years, the interest of scientists…
(more)
▼ A true understanding of the mechanisms behind most of the brain diseases is still out of reach. For several years, the interest of scientists has been focused on the genetic and biological causes, however, recent studies unraveled the importance of the biomechanics of the brain growth, folding, impact resistance, and deformation on its pathological conditions. While, a wide range of different methods have been used for characterization of the mechanical properties of the brain at the tissue level, the obtained results from different studies are extremely scattered and sometimes in contrast to one another. Since the brain tissue is extremely soft, its mechanical properties are quite a challenge to be obtained. In this study, the accurate analysis of the mechanical heterogeneity of the brain tissue is performed through dynamic and pseudo-static indentation techniques to evaluate the viscoelastic response of the brain and presenting its anisotropy, inhomogeneity, and rate dependence. In addition, this research provides a detailed reference for modeling the nonlinear mechanical behavior of soft tissues, in general, and the brain tissue, in particular, with addressing important considerations for mechanical modeling in uniaxial loading conditions. With thoroughly presenting the physical basis of the modeling procedure, it is shown that if such considerations are neglected, a considerable inaccurate evaluation of the mechanical properties of the tissue can be expected, although the results might mathematically be correct. Moreover, a new model is developed for the mechanical behavior of the brain tissue that addresses the tension-compression asymmetry with taking into account the compressibility of the tissue in different loading conditions. This model is implemented by utilizing a combined analytical and numerical scheme. The results of this research could be used as input variables for computer simulations of the brain tissue in studying the traumatic brain injury, malformation of the brain folds, and other pathobiological conditions associated with the mechanical behavior of the brain.
Subjects/Keywords: Brain Biomechanics; Indirect Indentation; Viscoelasticity; Hyperelasticity; Finite Element Modeling
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APA ·
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APA (6th Edition):
Samadidooki, A. (2018). Experimental, Analytical, and Numerical Evaluation of the Mechanical Properties of the Brain Tissue. (Doctoral Dissertation). Louisiana State University. Retrieved from https://digitalcommons.lsu.edu/gradschool_dissertations/4622
Chicago Manual of Style (16th Edition):
Samadidooki, Aref. “Experimental, Analytical, and Numerical Evaluation of the Mechanical Properties of the Brain Tissue.” 2018. Doctoral Dissertation, Louisiana State University. Accessed October 17, 2019.
https://digitalcommons.lsu.edu/gradschool_dissertations/4622.
MLA Handbook (7th Edition):
Samadidooki, Aref. “Experimental, Analytical, and Numerical Evaluation of the Mechanical Properties of the Brain Tissue.” 2018. Web. 17 Oct 2019.
Vancouver:
Samadidooki A. Experimental, Analytical, and Numerical Evaluation of the Mechanical Properties of the Brain Tissue. [Internet] [Doctoral dissertation]. Louisiana State University; 2018. [cited 2019 Oct 17].
Available from: https://digitalcommons.lsu.edu/gradschool_dissertations/4622.
Council of Science Editors:
Samadidooki A. Experimental, Analytical, and Numerical Evaluation of the Mechanical Properties of the Brain Tissue. [Doctoral Dissertation]. Louisiana State University; 2018. Available from: https://digitalcommons.lsu.edu/gradschool_dissertations/4622
Oklahoma State University
9.
Liang, Junfeng.
Determination of The Mechanical Properties of Guinea Pig Tympanic Membrane Using Combined Fringe Projection and Simulations.
Degree: Mechanical & Aerospace Engineering, 2009, Oklahoma State University
URL: http://hdl.handle.net/11244/9980
► Measurement of the mechanical properties of guinea pig tympanic membrane (TM) with fringe projection and simulation. Fringe projection technique was used to provide optic access…
(more)
▼ Measurement of the mechanical properties of guinea pig tympanic membrane (TM) with fringe projection and simulation. Fringe projection technique was used to provide optic access for measurement of the volume displacement of TM under different pressure levels. FEM model with hyperelastic constitute law was built to simulate the experimental procedure. Experimental data and simulation result were fitted to obtain the hyperelastic parameters of guinea pig TM. Hardening effects was observed through pressure- volume displacement curve. The stress- strain curve plotted based on the estimated mechanical properties was also reflect such phenomenon. Comparison between the positive and negative pressure loading from middle ear cavity indicate that, such hardening effect is stronger as negative pressure applied. The observation of the section profile of 3-D surface reconstruction of TM with Fringe projection technique shows that, the displacement around umbo is asymmetric. It means that the malleus tend to rotate rather than translate at high pressure level. The experimental design was compared with other research group. Full-field mechanical properties measured with the designed experiment were validated by comparison to existed data in literature.
Advisors/Committee Members: Lu, Hongbing (advisor), Yin, Wei (committee member), Rubenstein, David (committee member).
Subjects/Keywords: finite element method; fringe projection; hyperelasticity; tympanic membrane
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APA (6th Edition):
Liang, J. (2009). Determination of The Mechanical Properties of Guinea Pig Tympanic Membrane Using Combined Fringe Projection and Simulations. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/9980
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Liang, Junfeng. “Determination of The Mechanical Properties of Guinea Pig Tympanic Membrane Using Combined Fringe Projection and Simulations.” 2009. Thesis, Oklahoma State University. Accessed October 17, 2019.
http://hdl.handle.net/11244/9980.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liang, Junfeng. “Determination of The Mechanical Properties of Guinea Pig Tympanic Membrane Using Combined Fringe Projection and Simulations.” 2009. Web. 17 Oct 2019.
Vancouver:
Liang J. Determination of The Mechanical Properties of Guinea Pig Tympanic Membrane Using Combined Fringe Projection and Simulations. [Internet] [Thesis]. Oklahoma State University; 2009. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/11244/9980.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liang J. Determination of The Mechanical Properties of Guinea Pig Tympanic Membrane Using Combined Fringe Projection and Simulations. [Thesis]. Oklahoma State University; 2009. Available from: http://hdl.handle.net/11244/9980
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
10.
Basile, Graziano.
Analisi teorico sperimentale di materiali iperelastici.
Degree: 2012, Università degli Studi di Catania
URL: http://hdl.handle.net/10761/1108
► Il presente lavoro è incentrato sulla caratterizzazione di materiali a comportamento Iperelastico, e quindi volto alla determinazione dei parametri della funzione energia di deformazione. Per…
(more)
▼ Il presente lavoro è incentrato sulla caratterizzazione di materiali a comportamento Iperelastico, e quindi volto alla determinazione dei parametri della funzione energia di deformazione.
Per la realizzazione delle prove meccaniche, sono stati progettati e realizzati i sistemi di test di tipo planare, utilizzati anche per prove monoassiali, e di un opportuno sistema per test biassiali.
I sistemi permettono in maniera agevole la realizzazione dei test necessari e passare in maniera veloce da un set-up ad un altro.
Per l impossibilità di poter applicare le tecniche di estensimetria di contatto, per via delle grandi deformazioni in gioco, è presentata una metodologia di rilievo mediante l utilizzo di una camera CCD ad alta risoluzione ed una procedura automatica di post elaborazione e sincronizzazione dei dati provenienti dalla prova mediante l utilizzo dei software Labview® e Matlab®.
Il sistema misuristico messo a punto ha dato ottimi risultati e la perfetta sovrapposizione delle curve sforzo-deformazione ottenute con le curve provenienti dalla macchina di prova, nel caso di prove monoassiali e planari, mostrando la bontà della procedura e l applicabilità sui test biassiali dove non è possibile effettuare un confronto diretto con i dati provenienti dalla macchina monoassiale.
Il materiale utilizzato al raggiungimento dello scopo è un silicone commerciale, prodotto dalla Angst + Pfister, con sigla VMQ.
Infine, ottenute le curve caratteristiche, quindi caratterizzato il materiale secondo il miglior fit con i modelli disponibili in letteratura, è stata verificata la rispondenza del modello con l analisi numerica agli elementi finiti.
È stato anche proposto un metodo iterativo basato sull analisi dell immagine e analisi numeriche agli elementi finiti per l identificazione della componente volumetrica.
Concludendo, il presente lavoro non ha avuto come unico obiettivo quello di testare un materiale a comportamento non lineare, ma anche quello di realizzare in maniera semplice ed accessibile una metodologia di test soprattutto nel caso bi-assiale e nel contempo capire e darne il giusto peso al termine volumetrico nei modelli di energia di deformazione.
Subjects/Keywords: Area 09 - Ingegneria industriale e dell'informazione; Hyperelasticity, Elastomers, Characterization, Biaxial, Mooney, Optical Method
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APA (6th Edition):
Basile, G. (2012). Analisi teorico sperimentale di materiali iperelastici. (Thesis). Università degli Studi di Catania. Retrieved from http://hdl.handle.net/10761/1108
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Basile, Graziano. “Analisi teorico sperimentale di materiali iperelastici.” 2012. Thesis, Università degli Studi di Catania. Accessed October 17, 2019.
http://hdl.handle.net/10761/1108.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Basile, Graziano. “Analisi teorico sperimentale di materiali iperelastici.” 2012. Web. 17 Oct 2019.
Vancouver:
Basile G. Analisi teorico sperimentale di materiali iperelastici. [Internet] [Thesis]. Università degli Studi di Catania; 2012. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/10761/1108.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Basile G. Analisi teorico sperimentale di materiali iperelastici. [Thesis]. Università degli Studi di Catania; 2012. Available from: http://hdl.handle.net/10761/1108
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Sul
11.
Wrubleski, Eduardo Guilherme Mötke.
Inclusão de efeitos dissipativos em modelos constitutivos hiperelásticos através da modificação da função energia de deformação.
Degree: 2015, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/114972
► Este trabalho apresenta uma metodologia para a inclusão de fenômenos dissipativos em relações constitutivas hiperelásticas. Embora seja dada ênfase para o efeito Mullins e histerese,…
(more)
▼ Este trabalho apresenta uma metodologia para a inclusão de fenômenos dissipativos em relações constitutivas hiperelásticas. Embora seja dada ênfase para o efeito Mullins e histerese, esse procedimento pode ser aplicado a outros fenômenos como, por exemplo, de dano. Para isso, adota-se um modelo fenomenológico que inclui amolecimento em um modelo constitutivo hiperelástico através da pseudo-elasticidade, que permite que diferentes potenciais de energia possam ser utilizados em diferentes etapas do carregamento. Foram utilizados dois modelos hiperelásticos incompressíveis: Ogden e Hoss-Marczak. Para esse estudo, foram selecionados quatro diferentes materiais da literatura, três deles apresentavam apenas dados experimentais para tração uniaxial, enquanto o outro disponibilizou os ensaios de tração uniaxial, tração equibiaxial e cisalhamento puro. Foram selecionados dois parâmetros de amolecimento da literatura (Ogden e Roxburgh, 1999, e Dorfmann e Ogden, 2003) para modelar fenômenos dissipativos e então foram propostos novos parâmetros de amolecimento. Verificação gráfica dos resultados e um coeficiente de correlação (R2) foram utilizados para comparar o desempenho desses parâmetros. Os materiais foram considerados isotrópicos e incompressíveis e o carregamento quasi-estático para obtenção dos resultados. Alguns parâmetros propostos não capturaram o efeito dissipativo, outros superestimaram o amolecimento, enquanto os da literatura capturaram o efeito. Ao final, obteve-se resultados bastante satisfatórios para um dos parâmetros propostos, que se verificou ser uma generalização do modelo de Dorfmann e Ogden, 2003.
This work applies a methodology to include dissipative effects in hyperelastic constitutive relations. The paper focuses on the Mullins effect and hysteresis. However, the methodology can also be applied to other phenomena, like damage. Basically, it is a phenomenological inclusion of the softening behavior in a hyperelastic constitutive model using pseudo-elasticity, in which different energy potentials can be used in different steps of the loading. Two hyperelastic models were employed: Ogden’s and Hoss-Marczak’s models. Four different materials were modeled, three of them subjected to uniaxial tension only, and a fourth subjected to the three classical loadings, namely, uniaxial tension, equibiaxial tension and pure shear. Two softening parameters from the literature were implemented and new softening parameters were proposed. Graphical inspection and R2 correlation coefficient were used to compare the softening parameters. The materials were considered isotropic and incompressible, being subjected to quasi-static loading. Some of the proposed parameters did not captured the dissipative effect, other overestimate the softening, and those from the literature were able to capture the effects. Finally, very satisfying results were obtained with one the proposed softening parameters, which was a generalization of the one proposed by Dorfmann e Ogden, 2003.
Advisors/Committee Members: Marczak, Rogerio Jose.
Subjects/Keywords: Pseudo-elasticity; Elasticidade; Ensaios de tração; Hyperelasticity; Histerese; Mulins effect; Hysteresis; Constitutive models
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APA (6th Edition):
Wrubleski, E. G. M. (2015). Inclusão de efeitos dissipativos em modelos constitutivos hiperelásticos através da modificação da função energia de deformação. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/114972
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wrubleski, Eduardo Guilherme Mötke. “Inclusão de efeitos dissipativos em modelos constitutivos hiperelásticos através da modificação da função energia de deformação.” 2015. Thesis, Universidade do Rio Grande do Sul. Accessed October 17, 2019.
http://hdl.handle.net/10183/114972.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wrubleski, Eduardo Guilherme Mötke. “Inclusão de efeitos dissipativos em modelos constitutivos hiperelásticos através da modificação da função energia de deformação.” 2015. Web. 17 Oct 2019.
Vancouver:
Wrubleski EGM. Inclusão de efeitos dissipativos em modelos constitutivos hiperelásticos através da modificação da função energia de deformação. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2015. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/10183/114972.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wrubleski EGM. Inclusão de efeitos dissipativos em modelos constitutivos hiperelásticos através da modificação da função energia de deformação. [Thesis]. Universidade do Rio Grande do Sul; 2015. Available from: http://hdl.handle.net/10183/114972
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Grenoble
12.
Machado, Guilherme.
Contribution à l'étude de l'anisotropie induite par l'effet Mullins dans les élastomères silicones chargés : A contribution to the study of induced anisotropy by Mullins effect in silicone rubber.
Degree: Docteur es, Matériaux, mécanique, génie civil, électrochimie, 2011, Université de Grenoble
URL: http://www.theses.fr/2011GRENI029
► Le présent travail étudie la caractérisation expérimentale et la modélisation de l'anisotropie induite par effet Mullins, i.e., la perte de raideur après les premiers cycles…
(more)
▼ Le présent travail étudie la caractérisation expérimentale et la modélisation de l'anisotropie induite par effet Mullins, i.e., la perte de raideur après les premiers cycles de chargement, très souvent observée dans les matériaux de type élastomère. Après une description des caractéristiques mécaniques du matériau silicone utilisé dans notre étude, des essais expérimentaux originaux sont développés pour créer des historiques de chargement complexes. D'une part, des successions d'essais de traction uniaxiale classiques sont réalisées, avec changement de directions de chargement. D'autre part, des états hétérogènes de contrainte et déformation obtenus lors d'essais de gonflement de membrane circulaire ont été complètement caractérisés grâce à des mesures de champs cinématiques réalisées par la méthode de corrélations d'images 3D ; les chargements effectués sont alors de type traction biaxiale-traction simple. Les paramètres clés pour la modélisation de l'effet Mullins ont ainsi pu être mis en évidence, avec notamment ses parts isotrope et anisotrope. Un modèle a ainsi été développé à partir d'une théorie de double réseau prenant en compte des critères expérimentalement motivés. Une version adaptée à une implantation simple dans un code de calculs éléments finis est finalement développée pour la réalisation de calculs de structures.
The present work studies the experimental characterization and modeling of the anisotropy induced by Mullins effect, i.e., the loss of stiffness in the first loading cycles, often observed in rubber-like materials. After a description of the mechanical characteristics of the particular silicone material used in our study, experimental tests are developed to create original and complex loading histories. First, successions of conventional uniaxial tensile tests are performed with changing directions of loading. Second, the state of heterogeneous stress and strain obtained in circular membrane swelling tests was completely characterized by means of kinematic field measurements made by the 3D image correlation method, and the loadings are then biaxial tension followed by uniaxial traction. The key parameters for modeling the Mullins effect were able to be identified, including its isotropic and anisotropic parts. A model was thus developed based on the double-network theory taking into account the experimentally motivated criteria. A suitable version with simple implementation in a finite element computer code was finally developed to allow the calculation of a structural part.
Advisors/Committee Members: Favier, Denis (thesis director).
Subjects/Keywords: Effet Mullins; Hyperélasticité; Élastomères silicone; Anisotropie; Mullins effect; Hyperelasticity; Silicone rubber; Anistropy
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APA ·
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APA (6th Edition):
Machado, G. (2011). Contribution à l'étude de l'anisotropie induite par l'effet Mullins dans les élastomères silicones chargés : A contribution to the study of induced anisotropy by Mullins effect in silicone rubber. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2011GRENI029
Chicago Manual of Style (16th Edition):
Machado, Guilherme. “Contribution à l'étude de l'anisotropie induite par l'effet Mullins dans les élastomères silicones chargés : A contribution to the study of induced anisotropy by Mullins effect in silicone rubber.” 2011. Doctoral Dissertation, Université de Grenoble. Accessed October 17, 2019.
http://www.theses.fr/2011GRENI029.
MLA Handbook (7th Edition):
Machado, Guilherme. “Contribution à l'étude de l'anisotropie induite par l'effet Mullins dans les élastomères silicones chargés : A contribution to the study of induced anisotropy by Mullins effect in silicone rubber.” 2011. Web. 17 Oct 2019.
Vancouver:
Machado G. Contribution à l'étude de l'anisotropie induite par l'effet Mullins dans les élastomères silicones chargés : A contribution to the study of induced anisotropy by Mullins effect in silicone rubber. [Internet] [Doctoral dissertation]. Université de Grenoble; 2011. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2011GRENI029.
Council of Science Editors:
Machado G. Contribution à l'étude de l'anisotropie induite par l'effet Mullins dans les élastomères silicones chargés : A contribution to the study of induced anisotropy by Mullins effect in silicone rubber. [Doctoral Dissertation]. Université de Grenoble; 2011. Available from: http://www.theses.fr/2011GRENI029
Université Montpellier II
13.
Jaudouin, Olivier.
Physico-chimie de matériaux à base d'élastomères modifiés hyperélastiques : Physical chemistry of materials based on modified hyperelastic elastomers.
Degree: Docteur es, Chimie et Physicochimie des matériaux, 2011, Université Montpellier II
URL: http://www.theses.fr/2012MON20036
► Cette thèse vise à développer des matériaux destinés à remplacer les gants des boîtes à gants utilisées en milieu nucléaire confiné par des disques élastomères…
(more)
▼ Cette thèse vise à développer des matériaux destinés à remplacer les gants des boîtes à gants utilisées en milieu nucléaire confiné par des disques élastomères pouvant prendre la forme des mains lorsqu'un opérateur insère son bras et revenir à leur forme initiale lorsqu'il l'enlève. Le but du travail est de réaliser et d'étudier les propriétés physico-chimiques de matériaux capables de se déformer à plus de 2000 %, à être totalement élastique, à résister au déchirement et aux radiations. Dans un premier temps, une étude bibliographique a montré que les matériaux les plus susceptibles d'y répondre sont les élastomères thermoplastiques. Des matériaux de deux familles d'élastomères thermoplastiques ont donc été réalisés et étudiés. Les premiers sont les élastomères thermoplastiques polyuréthanes. L'influence de la stœchiométrie des monomères et de la structure chimique de différents allongeurs de chaînes sur les propriétés mécaniques a été étudiée. Il en ressort que ces matériaux sont trop visqueux pour répondre au cahier des charges mais une relation intéressante de linéarité entre la contrainte à l'écoulement et le taux de viscosité de l'ensemble de ces formulations a été observée. Les seconds matériaux sont des copolymères Styrène-Ethylène-Butylène-Styrène (SEBS). Les effets du procédé de mise en œuvre ainsi que l'incorporation de plastifiants, de nanoparticules ou de polyuréthane sur les propriétés mécaniques de ces matériaux ont été étudiés. Il a été mis en évidence que le procédé de mise en œuvre influence fortement les propriétés mécaniques et que l'ajout de nanoparticules et de polyuréthane permet d'améliorer certaines propriétés mécaniques. Globalement, les matériaux développés ont des propriétés très proches de celles de matériaux hyperélastiques.
The aim of this PhD work is to replace current gloves of gloveboxes used in nuclear area by elastomer discs which could take the shape of the arm of an operator and come back to their original shape when the arm is removed. The goal of the work is to design and study a material meeting the following specifications: at least 2 000 % strain at break, very high elastic properties, tear and radiation resistant. A bibliographic study showed that the most relevant materials are thermoplastic elastomers. As a consequence, two kinds of these materials were formulated. First ones are thermoplastic polyurethane elastomers. The influence of stoichiometric ratios and different chain extenders on mechanical properties was studied. These materials are too viscous to match the specifications but an interesting linear relation between flow stress and viscosity ratio was observed. Second ones are Styrene-Ethylene-Butylene-Styrene copolymers (SEBS). Studies on the influence of the process and incorporation of plasticizers, nanoparticules or polyurethane were carried out. It was highlighted that the process strongly influences mechanical properties and addition of nanoparticules or polyurethane can increase some of these properties. On the whole, the materials developed are very…
Advisors/Committee Members: Robin, Jean-Jacques (thesis director), Lopez-Cuesta, José-Marie (thesis director).
Subjects/Keywords: Elastomères thermoplastiques; Polyuréthane; Sebs; Propriétés mécaniques; Hyperélasticité; Thermoplastic elastomers; Polyurethane; Sebs; Mechanical properties; Hyperelasticity
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APA ·
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APA (6th Edition):
Jaudouin, O. (2011). Physico-chimie de matériaux à base d'élastomères modifiés hyperélastiques : Physical chemistry of materials based on modified hyperelastic elastomers. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2012MON20036
Chicago Manual of Style (16th Edition):
Jaudouin, Olivier. “Physico-chimie de matériaux à base d'élastomères modifiés hyperélastiques : Physical chemistry of materials based on modified hyperelastic elastomers.” 2011. Doctoral Dissertation, Université Montpellier II. Accessed October 17, 2019.
http://www.theses.fr/2012MON20036.
MLA Handbook (7th Edition):
Jaudouin, Olivier. “Physico-chimie de matériaux à base d'élastomères modifiés hyperélastiques : Physical chemistry of materials based on modified hyperelastic elastomers.” 2011. Web. 17 Oct 2019.
Vancouver:
Jaudouin O. Physico-chimie de matériaux à base d'élastomères modifiés hyperélastiques : Physical chemistry of materials based on modified hyperelastic elastomers. [Internet] [Doctoral dissertation]. Université Montpellier II; 2011. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2012MON20036.
Council of Science Editors:
Jaudouin O. Physico-chimie de matériaux à base d'élastomères modifiés hyperélastiques : Physical chemistry of materials based on modified hyperelastic elastomers. [Doctoral Dissertation]. Université Montpellier II; 2011. Available from: http://www.theses.fr/2012MON20036
14.
Oueslati, Zied.
Modèle de comportement pour la modélisation du thermoformage de feuilles plastiques multicouches : Constitutive law for modeling multilayered thermplastic sheets thermoforming.
Degree: Docteur es, Mécanique Avancée, 2015, Compiègne
URL: http://www.theses.fr/2015COMP2213
► Les Thermoplastique Polyoléfine (TPO) se sont avérés très intéressants pour les applications automobiles. Les caractéristiques mécaniques de ces matériaux sont en bon accord avec le…
(more)
▼ Les Thermoplastique Polyoléfine (TPO) se sont avérés très intéressants pour les applications automobiles. Les caractéristiques mécaniques de ces matériaux sont en bon accord avec le contexte environnemental et économique de la dernière décennie. En fait, au-delà de leur coût et recyclabilité, ils permettent un gain de poids important, une excellente flexibilité de conception et de hautes qualité en terme d'apparence ou de caractéristiques tactiles et olfactives. Le but de cette étude était de modéliser le comportement des nouvelles feuilles de TPO pour les applications de thermoformage. Le matériau étudié peut atteindre de très hautes valeurs d'allongement (jusqu’à 800%) et se distingue par une isotropie transverse. Afin de prédire correctement la distribution de l'épaisseur des pièces thermoformées finales, des essais detraction uniaxiale ont été menés le long des directions longitudinale, transversale et diagonale et à 5 températures différentes de ambiante à 120 °C. Un nouveau modèle hyperélastique isotrope transverstal a été développé. Les paramètres matériau à chacune des températures ont été identifiés en utilisant des méthodes inverses, et de bons résultats ont été obtenus. La procédure d'identification s'est avéré être difficile en raison de la grande sensibilité des paramètres et les problèmes d'instabilité en grandes déformations. Des techniques de mesures champ de déplacement 3D ont finalement été menées et associés à un test de thermoformage afin de valider la procédure matériel d'identification.
Thermoplastic PolyOiefin (TPO) materials have shown great interest for automotive applications. The mechanical characteristics of these materials are in good agreements with the environmental and economical context of the last decade. ln fact, beyond their cost and recyclability, they allow important weight gain, excellent design flexibility, and high quality whether in term of appearance or tactile and olfactory perceptions. The aim of this study was to model the behavior of new TPO sheets for thermoforming applications. The studied material can reach very high stretch ranges (up to 800%) and was found to be transversely isotropie. ln order to properly predict the thickness distribution of the final thermoformed parts, uniaxial tensile tests were performed along the longitudinal, transverse and diagonal directions, at 5 different temperatures from ambient to 120°C. A new transversely isotropic hyperelastic model was developed using User Subroutines in Abaqus software. The material parameters at each temperature have been identified using inverse methods, and good results have been obtained. The identification procedure has shown to be difficult because of the high sensitivity of the material parameters and the instability problems at high stretch ranges. 3D displacement field techniques were finally conducted and associated to a thermoforming test in order to validate the material parameter identification procedure.
Advisors/Committee Members: Rachik, Mohamed (thesis director).
Subjects/Keywords: Hyperélasticité; Identification inverse; Mesures de champs; Modélisation; TPO; Thermoplastics; Anisotropy; Polyolefins; Hyperelasticity; Optimization; Mathematical models
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Manager
APA (6th Edition):
Oueslati, Z. (2015). Modèle de comportement pour la modélisation du thermoformage de feuilles plastiques multicouches : Constitutive law for modeling multilayered thermplastic sheets thermoforming. (Doctoral Dissertation). Compiègne. Retrieved from http://www.theses.fr/2015COMP2213
Chicago Manual of Style (16th Edition):
Oueslati, Zied. “Modèle de comportement pour la modélisation du thermoformage de feuilles plastiques multicouches : Constitutive law for modeling multilayered thermplastic sheets thermoforming.” 2015. Doctoral Dissertation, Compiègne. Accessed October 17, 2019.
http://www.theses.fr/2015COMP2213.
MLA Handbook (7th Edition):
Oueslati, Zied. “Modèle de comportement pour la modélisation du thermoformage de feuilles plastiques multicouches : Constitutive law for modeling multilayered thermplastic sheets thermoforming.” 2015. Web. 17 Oct 2019.
Vancouver:
Oueslati Z. Modèle de comportement pour la modélisation du thermoformage de feuilles plastiques multicouches : Constitutive law for modeling multilayered thermplastic sheets thermoforming. [Internet] [Doctoral dissertation]. Compiègne; 2015. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2015COMP2213.
Council of Science Editors:
Oueslati Z. Modèle de comportement pour la modélisation du thermoformage de feuilles plastiques multicouches : Constitutive law for modeling multilayered thermplastic sheets thermoforming. [Doctoral Dissertation]. Compiègne; 2015. Available from: http://www.theses.fr/2015COMP2213
Rochester Institute of Technology
15.
Lillie, Jeffrey S.
Development, Validation, and Clinical Application of a Numerical Model for Pulse Wave Velocity Propagation in a Cardiovascular System with Application to Noninvasive Blood Pressure Measurements.
Degree: PhD, Microsystems Engineering, 2017, Rochester Institute of Technology
URL: https://scholarworks.rit.edu/theses/9379
► High blood pressure blood pressure is an important risk factor for cardiovascular disease and affects almost one-third of the U.S. adult population. Historical cuff-less…
(more)
▼ High blood pressure blood pressure is an important risk factor for cardiovascular disease and affects almost one-third of the U.S. adult population. Historical cuff-less non-invasive techniques used to monitor blood pressure are not accurate and highlight the need for first principal models. The first model is a one-dimensional model for pulse wave velocity (PWV) propagation in compliant arteries that accounts for nonlinear fluids in a linear elastic thin walled vessel. The results indicate an inverse quadratic relationship (R
2=.99) between ejection time and PWV, with ejection time dominating the PWV shifts (12%). The second model predicts the general relationship between PWV and blood pressure with a rigorous account of nonlinearities in the fluid dynamics, blood vessel elasticity, and finite dynamic deformation of a membrane type thin anisotropic wall. The nonlinear model achieves the best match with the experimental data. To retrieve individual vascular information of a patient, the inverse problem of hemodynamics is presented, calculating local orthotropic hyperelastic properties of the arterial wall. The final model examines the impact of the thick arterial wall with different material properties in the radial direction. For a hypertensive
subject the thick wall model provides improved accuracy up to 8.4% in PWV prediction over its thin wall counterpart. This translates to nearly 20% improvement in blood pressure prediction based on a PWV measure. The models highlight flow velocity is additive to the classic pressure wave, suggesting flow velocity correction may be important for cuff-less, non-invasive blood pressure measures. Systolic flow correction of the measured PWV improves the R2 correlation to systolic blood pressure from 0.81 to 0.92 for the mongrel dog study, and 0.34 to 0.88 for the human subjects study. The algorithms and insight resulting from this work can enable the development of an integrated microsystem for cuff-less, non-invasive blood pressure monitoring.
Advisors/Committee Members: David A. Borkholder, Alexander S. Liberson, Steven W. Day.
Subjects/Keywords: Blood pressure; Convective fluid; Finite deformation; Hyperelasticity; Nonlinear 1D model; Pulse wave velocity
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APA (6th Edition):
Lillie, J. S. (2017). Development, Validation, and Clinical Application of a Numerical Model for Pulse Wave Velocity Propagation in a Cardiovascular System with Application to Noninvasive Blood Pressure Measurements. (Doctoral Dissertation). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/9379
Chicago Manual of Style (16th Edition):
Lillie, Jeffrey S. “Development, Validation, and Clinical Application of a Numerical Model for Pulse Wave Velocity Propagation in a Cardiovascular System with Application to Noninvasive Blood Pressure Measurements.” 2017. Doctoral Dissertation, Rochester Institute of Technology. Accessed October 17, 2019.
https://scholarworks.rit.edu/theses/9379.
MLA Handbook (7th Edition):
Lillie, Jeffrey S. “Development, Validation, and Clinical Application of a Numerical Model for Pulse Wave Velocity Propagation in a Cardiovascular System with Application to Noninvasive Blood Pressure Measurements.” 2017. Web. 17 Oct 2019.
Vancouver:
Lillie JS. Development, Validation, and Clinical Application of a Numerical Model for Pulse Wave Velocity Propagation in a Cardiovascular System with Application to Noninvasive Blood Pressure Measurements. [Internet] [Doctoral dissertation]. Rochester Institute of Technology; 2017. [cited 2019 Oct 17].
Available from: https://scholarworks.rit.edu/theses/9379.
Council of Science Editors:
Lillie JS. Development, Validation, and Clinical Application of a Numerical Model for Pulse Wave Velocity Propagation in a Cardiovascular System with Application to Noninvasive Blood Pressure Measurements. [Doctoral Dissertation]. Rochester Institute of Technology; 2017. Available from: https://scholarworks.rit.edu/theses/9379
16.
Crabbé, Blandine.
Gradient damage models in large deformation : Modèles d'endommagement à gradient en grandes déformations.
Degree: Docteur es, Mécanique des matériaux, 2018, Paris Saclay
URL: http://www.theses.fr/2018SACLX085
► Les modèles d'endommagement à gradient, aussi dénommés modèles à champs de phases, sont désormais largement utilisés pour modéliser la rupture fragile et ductile, depuis l'initiation…
(more)
▼ Les modèles d'endommagement à gradient, aussi dénommés modèles à champs de phases, sont désormais largement utilisés pour modéliser la rupture fragile et ductile, depuis l'initiation de l'endommagement jusqu'à la propagation d'une fissure. Cependant, la majorité des études disponibles dans la littérature ne concerne que le cadre des petites déformations, et très peu d'études poussées ont été menées afin d'étudier leur pertinence dans un contexte de grandes déformations. Ce serait pourtant d'un intérêt primordial, notamment pour l'industrie pneumatique, qui deviendrait alors capable de prédire plus précisément l'initiation de l'endommagement dans ses structures.Dans la première partie de ce travail, nous établissons des solutions analytiques d'évolution de l'endommagement (homogène et localisée) pour des matériaux visqueux, en petites et en grandes déformations. En petites déformations, les modèles rhéologiques de Maxwell et Poynting-Thomson sont étudiés, et en grandes déformations, les modèles de Maxwell et Zener sont choisis. Une étude sur l'évolution de l'endommagement dans un cas purement hyperélastique est aussi menée.A cette première partie analytique succède une partie numérique, qui détaille l'implémentation des modèles d'endommagement à gradient dans des codes éléments finis en grandes déformations. De même qu'en petites déformations, une stratégie de minimisation alternée est adoptée pour résoudre successivement les problèmes d'endommagement et de déplacement. Le matériau suit une loi de Mooney-Rivlin quasi-incompressible, et une méthode mixte en déplacement-pression est utilisée. Des tests en 2D et 3D sont effectués, qui mettent en évidence la capacité des modèles à initier de l'endommagement en grandes déformations.Les modèles d'endommagement utilisés pour la seconde partie ne sont cependant capables d'initier de l'endommagement que dans les zones où la déformation est importante, c'est-à-dire dans les zones de forte contrainte déviatorique. Il a toutefois été montré que certains matériaux polymères, quasi-incompressibles, s'endommagent dans les zones de forte pression hydrostatique. Par conséquent, la recherche et l'étude d'un modèle d'endommagement capable d'initier de l'endommagement dans les zones de forte pression, pour des matériaux quasi-incompressibles lorsqu'ils sont sains, fait l'objet d'une troisième partie.Enfin, la croissance brusque de cavités dans un matériau hyperélastique, appelée phénomène de cavitation, est étudiée, ainsi que son interaction avec l'endommagement. Dans un premier temps, nous considérons la cavitation comme une simple bifurcation hyperélastique d'un matériau néo-hookéen compressible isotrope, et déterminons l'expression analytique de l'élongation critique pour laquelle la cavitation fait son apparition. Dans un second temps, nous montrons qu'il y a une compétition entre la cavitation et l'endommagement, et qu'en fonction de la valeur du ratio des élongations critiques respectives pour chaque phénomène, deux types de rupture apparaissent.
Gradient damage models, also…
Advisors/Committee Members: Marigo, Jean-Jacques (thesis director).
Subjects/Keywords: Endommagement; Rupture; Cavitation; Hyperélasticité; Pression; Viscoélasticité; Damage; Rupture; Cavitation; Hyperelasticity; Pressure; Viscoelasticity; 531.015
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APA ·
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APA (6th Edition):
Crabbé, B. (2018). Gradient damage models in large deformation : Modèles d'endommagement à gradient en grandes déformations. (Doctoral Dissertation). Paris Saclay. Retrieved from http://www.theses.fr/2018SACLX085
Chicago Manual of Style (16th Edition):
Crabbé, Blandine. “Gradient damage models in large deformation : Modèles d'endommagement à gradient en grandes déformations.” 2018. Doctoral Dissertation, Paris Saclay. Accessed October 17, 2019.
http://www.theses.fr/2018SACLX085.
MLA Handbook (7th Edition):
Crabbé, Blandine. “Gradient damage models in large deformation : Modèles d'endommagement à gradient en grandes déformations.” 2018. Web. 17 Oct 2019.
Vancouver:
Crabbé B. Gradient damage models in large deformation : Modèles d'endommagement à gradient en grandes déformations. [Internet] [Doctoral dissertation]. Paris Saclay; 2018. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2018SACLX085.
Council of Science Editors:
Crabbé B. Gradient damage models in large deformation : Modèles d'endommagement à gradient en grandes déformations. [Doctoral Dissertation]. Paris Saclay; 2018. Available from: http://www.theses.fr/2018SACLX085
Brno University of Technology
17.
Holubář, Oldřich.
Analýza šíření tlakové vlny v aortě
.
Degree: 2011, Brno University of Technology
URL: http://hdl.handle.net/11012/17996
► Tato diplomová práce je zaměřena na problematiku využití snímání šíření pulzní vlny aortou v oblasti diagnostiky aneurysmatu břišní aorty (AAA). V první části byl popsán…
(more)
▼ Tato diplomová práce je zaměřena na problematiku využití snímání šíření pulzní vlny aortou v oblasti diagnostiky aneurysmatu břišní aorty (AAA). V první části byl popsán kardiovaskulární systém a jeho patologie v podobě AAA. Dále byly shrnuty současné metody diagnostiky a navrženy nové, které budou založeny na principu snímání průběhu pulzní vlny. Byla provedena numerická simulace šíření pulzní vlny, s využitím výpočtové metody interakce tělesa s tekutinou, na zjednodušených geometrických modelech, které reprezentují určité úseky aorty. Cílem těchto analýz bylo ověřit použitelnost výpočtové metody interakce tělesa s tekutinou pro další rozvoj navrhovaných diagnostických metod.; This master thesis is focused on usage of monitoring pulse wave propagation in aortic system in a field of diagnostic abdominal aortic aneurysm (AAA). There is a description of cardio-vascular system and its pathology in a form of AAA. A summarization of temporary diagnostic method was created and some new methods were proposed. This new methods presume monitoring of pulse wave propagation. Fluid structure interaction (FSI) analyses of pulse wave propagation were performed on simplified models of geometry which representing specific sections of aorta. The goal of these analyses was to prove usage of FSI method in a future development of proposed diagnostic methods.
Advisors/Committee Members: Burša, Jiří (advisor).
Subjects/Keywords: aneurysma;
interakce tělesa s tekutinou;
hyperelasticita;
MKP;
FSI;
aneurysm;
fluid structure interaction;
hyperelasticity;
FEM;
FSI
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APA ·
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Manager
APA (6th Edition):
Holubář, O. (2011). Analýza šíření tlakové vlny v aortě
. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/17996
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Holubář, Oldřich. “Analýza šíření tlakové vlny v aortě
.” 2011. Thesis, Brno University of Technology. Accessed October 17, 2019.
http://hdl.handle.net/11012/17996.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Holubář, Oldřich. “Analýza šíření tlakové vlny v aortě
.” 2011. Web. 17 Oct 2019.
Vancouver:
Holubář O. Analýza šíření tlakové vlny v aortě
. [Internet] [Thesis]. Brno University of Technology; 2011. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/11012/17996.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Holubář O. Analýza šíření tlakové vlny v aortě
. [Thesis]. Brno University of Technology; 2011. Available from: http://hdl.handle.net/11012/17996
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
18.
Bang, Dongjun.
Peridynamic Modeling of Hyperelastic Materials
.
Degree: 2016, University of Arizona
URL: http://hdl.handle.net/10150/595809
► This study concerns the development of the peridynamic strain energy density function for a Neo-Hookean type membrane under equibiaxial, planar and uniaxial loading conditions. The…
(more)
▼ This study concerns the development of the peridynamic strain energy density function for a Neo-Hookean type membrane under equibiaxial, planar and uniaxial loading conditions. The material parameters for each loading case are determined by equating the peridynamic strain energy to those of the classical continuum mechanics. Therefore, the peridynamic equations of motion are derived based on the Neo-Hookean model under the assumption of incompressibility. Numerical results concern the deformation of a membrane without and with a defect in the form of a hole, an inclusion and a crack under equibiaxial, planar and uniaxial loading conditions. As part of the verification process, the peridynamic predictions are compared with those of finite element analysis. For all defect types and loading conditions, the comparisons indicate excellent agreement.
Advisors/Committee Members: Madenci, Erdogan (advisor), Madenci, Erdogan (committeemember), Frantziskonis, George N. (committeemember), Missoum, Samy (committeemember), Wu, Xiaoyi (committeemember).
Subjects/Keywords: hyperelasticity;
peridynamics;
Mechanical Engineering;
deformation
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Bang, D. (2016). Peridynamic Modeling of Hyperelastic Materials
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/595809
Chicago Manual of Style (16th Edition):
Bang, Dongjun. “Peridynamic Modeling of Hyperelastic Materials
.” 2016. Doctoral Dissertation, University of Arizona. Accessed October 17, 2019.
http://hdl.handle.net/10150/595809.
MLA Handbook (7th Edition):
Bang, Dongjun. “Peridynamic Modeling of Hyperelastic Materials
.” 2016. Web. 17 Oct 2019.
Vancouver:
Bang D. Peridynamic Modeling of Hyperelastic Materials
. [Internet] [Doctoral dissertation]. University of Arizona; 2016. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/10150/595809.
Council of Science Editors:
Bang D. Peridynamic Modeling of Hyperelastic Materials
. [Doctoral Dissertation]. University of Arizona; 2016. Available from: http://hdl.handle.net/10150/595809
Pontifical Catholic University of Rio de Janeiro
19.
EDGAR NOBUO MAMIYA.
[en] APPLICATION OF A CONTINUATED METHOD OF FINITE
ELASTICITY PROBLEMS OF INCOMPRESSIBLE MATERIALS.
Degree: 2018, Pontifical Catholic University of Rio de Janeiro
URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33289
► [pt] Apresenta-se aqui uma aplicação do método de continuação, baseado no algoritmo de Euler-Quase Newton, a problemas de equilíbrio de materiais hiperelásticos incompressíveis sujeitos a…
(more)
▼ [pt] Apresenta-se aqui uma aplicação do método de
continuação, baseado no algoritmo de Euler-Quase Newton, a
problemas de equilíbrio de materiais hiperelásticos incompressíveis
sujeitos a grandes deformações. Discretiza-se o problema misto
estado deformado-campo de pressão pela utilização do método dos
elementos finitos, prevendo-se a compatibilidade LBB entre os
espaços envolvidos. Propõe-se a utilização de uma função densidade
de energia de deformação para o material de Mooney-Rivlin distinta
daquela apresentada na literatura clássica, devido ao mal
comportamento do Hessiano associado à formulação
original.
[en] The application of a continuation method based on
the Euler-Chord algorithm to equilibrium problems of
incompressible, hyperelastic materials subjected to large
deformations is here presented. The mixed strained state-pressure
field problem is discretized by means of the finite element method,
taking into account the LBB compatibility condition between the
involved spaces. The utilization of a strain energy density
function diverse from the one presented in the classical
literature, is proposed, due to the ill behavior of the Hessian
associated with the original formulation.
Advisors/Committee Members: RUBENS SAMPAIO FILHO.
Subjects/Keywords: [pt] GRANDES DEFORMACOES; [en] LARGE STRAIN; [pt] MATERIAIS INCOMPRESSIVEIS; [en] INCOMPRESSIBLE MATERIALS; [pt] HIPERELASTICIDADE; [en] HYPERELASTICITY
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APA (6th Edition):
MAMIYA, E. N. (2018). [en] APPLICATION OF A CONTINUATED METHOD OF FINITE
ELASTICITY PROBLEMS OF INCOMPRESSIBLE MATERIALS. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33289
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
MAMIYA, EDGAR NOBUO. “[en] APPLICATION OF A CONTINUATED METHOD OF FINITE
ELASTICITY PROBLEMS OF INCOMPRESSIBLE MATERIALS.” 2018. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed October 17, 2019.
http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33289.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
MAMIYA, EDGAR NOBUO. “[en] APPLICATION OF A CONTINUATED METHOD OF FINITE
ELASTICITY PROBLEMS OF INCOMPRESSIBLE MATERIALS.” 2018. Web. 17 Oct 2019.
Vancouver:
MAMIYA EN. [en] APPLICATION OF A CONTINUATED METHOD OF FINITE
ELASTICITY PROBLEMS OF INCOMPRESSIBLE MATERIALS. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. [cited 2019 Oct 17].
Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33289.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
MAMIYA EN. [en] APPLICATION OF A CONTINUATED METHOD OF FINITE
ELASTICITY PROBLEMS OF INCOMPRESSIBLE MATERIALS. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2018. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33289
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Deborde, Julien.
Etude expérimentale et numérique d'un distributeur auto-régulant pour l'irrigation : The denial of justice under its economical aspect in the international arbitration law. The negative effect of the principle of "compétence-compétence".
Degree: Docteur es, Mécanique et Physique des Fluides, 2011, Aix-Marseille 1
URL: http://www.theses.fr/2011AIX10130
► Dans le cadre d’une collaboration avec la société PHYTOREM, nous avons élaboré un prototype de distribution autorégulé afin d’épandre des Eaux Usées après un simple…
(more)
▼ Dans le cadre d’une collaboration avec la société PHYTOREM, nous avons élaboré un prototype de distribution autorégulé afin d’épandre des Eaux Usées après un simple dégrillage et via la Phytorémédiation (dépollution par les plantes).La première approche du projet de thèse a été de comprendre les comportements rhéologiques des effluents, mis à disposition par Phytorem, et mécaniques du matériau élastomère de type EPDM. Nous avons exposé les différentes façons de retrouver leurs propriétés rhéologiques et mécaniques par le biais de divers tests de rhéométrie, concernant les effluents, et de traction uni-, bi- et équibi-axiale, pour la partie matériau. Ceci nous a permis d’obtenir d’une part, la viscosité de nos effluents, et d’autre part, la loi de comportement la mieux adaptée à notre matériau.La deuxième et dernière approche porte sur les interactions entre un fluide et une membrane hyperélastique ayant pour fonction de réguler un écoulement. Le comportement de la membrane contrainte par la pression a été simulé sous Abaqus. Ces résultats ont permis de modéliser l’écoulement (code CFD commercial) lorsque la membrane est déformée et de déterminer numériquement la loi débit/pression du dispositif. Ces développements numériques s’appuient sur la méthode des éléments finis et un couplage partitionné simple en une étape pour une première approche entre le fluide, la membrane et la structure. Les modèles numériques sont validés expérimentalement. Ces travaux participent à l’élaboration d’un prototype de distributeur auto-régulé.
In collaboration with PHYTOREM, we have developed a prototype of self-regulated drip emitter to spread the Wastewater after a simple screening using phytoremediation (remediation by plants).The first approach of the thesis project was to understand the rheological behaviour of waste provided by PHYTOREM, and mechanical properties behaviour of EPDM elastomer type. We have explained the different ways to find their rheological and mechanical properties through various rheometry tests on waste, and tension uni-, biand equibi-axiale, for the material part. This allowed us to obtain first, the viscosity of our waste, and secondly, the behaviour law of best suited to our material.The second and final approach focuses on the interactions between a fluid and a hyperelastic membrane whose function is to regulate flow. The membrane behaviour under pressure stress was simulated using Abaqus. These results were used to model the flow (commercial CFD) when the membrane is distorted and to determine numerically its flow versus pressure law. These developments are relying on numerical finite element method and partitionned into a single coupling step for a first approach between fluid, membrane and structure. The numerical models are validated experimentally. This work contributes to the development of a prototype of self-regulated drip emitter.
Advisors/Committee Members: Boukamel, Adnane (thesis director), Anselmet, Fabien (thesis director).
Subjects/Keywords: Rhéologie; Hyperélasticité; Grandes déformations; Interactions Fluide-Structure (IFS); Rheology; Hyperelasticity; Finite strain; Fluid-Structure Interaction (FSI)
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Deborde, J. (2011). Etude expérimentale et numérique d'un distributeur auto-régulant pour l'irrigation : The denial of justice under its economical aspect in the international arbitration law. The negative effect of the principle of "compétence-compétence". (Doctoral Dissertation). Aix-Marseille 1. Retrieved from http://www.theses.fr/2011AIX10130
Chicago Manual of Style (16th Edition):
Deborde, Julien. “Etude expérimentale et numérique d'un distributeur auto-régulant pour l'irrigation : The denial of justice under its economical aspect in the international arbitration law. The negative effect of the principle of "compétence-compétence".” 2011. Doctoral Dissertation, Aix-Marseille 1. Accessed October 17, 2019.
http://www.theses.fr/2011AIX10130.
MLA Handbook (7th Edition):
Deborde, Julien. “Etude expérimentale et numérique d'un distributeur auto-régulant pour l'irrigation : The denial of justice under its economical aspect in the international arbitration law. The negative effect of the principle of "compétence-compétence".” 2011. Web. 17 Oct 2019.
Vancouver:
Deborde J. Etude expérimentale et numérique d'un distributeur auto-régulant pour l'irrigation : The denial of justice under its economical aspect in the international arbitration law. The negative effect of the principle of "compétence-compétence". [Internet] [Doctoral dissertation]. Aix-Marseille 1; 2011. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2011AIX10130.
Council of Science Editors:
Deborde J. Etude expérimentale et numérique d'un distributeur auto-régulant pour l'irrigation : The denial of justice under its economical aspect in the international arbitration law. The negative effect of the principle of "compétence-compétence". [Doctoral Dissertation]. Aix-Marseille 1; 2011. Available from: http://www.theses.fr/2011AIX10130
Universidade do Rio Grande do Sul
21.
Lancini, Emmanuel.
Caracterização constitutiva de elastômeros utilizando testes de componentes.
Degree: 2012, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/55462
► Análises numéricas confiáveis do comportamento mecânico de materiais como borrachas, dependem muito de uma calibração precisa do modelo constitutivo hiperelástico utilizado. Estes modelos são calibrados…
(more)
▼ Análises numéricas confiáveis do comportamento mecânico de materiais como borrachas, dependem muito de uma calibração precisa do modelo constitutivo hiperelástico utilizado. Estes modelos são calibrados ajustando as curvas teóricas aos dados experimentais, obtidos por meio de ensaios usuais. Em muitos casos as amostras de matéria prima desses elastômeros já não se encontram disponíveis ou é impossível fabricar os corpos de prova requeridos. O objetivo deste trabalho é verificar a possibilidade de encontrar constantes constitutivas testando o próprio componente, ao invés dos usuais ensaios de tração, compressão e cisalhamento. A abordagem proposta consiste em criar uma rotina de programação associada a uma função custo onde, a partir de uma estimativa inicial de constantes constitutivas, sejam realizados processos iterativos de otimização buscando aproximar as curvas de força × deslocamento teórica e experimental. Um componente automotivo será utilizado nos estudos e dois modelos constitutivos hiperelásticos serão testados. As equações de tensões nominais dos modelos hiperelásticos serão utilizadas para predizer o comportamento teórico dos ensaios usuais, de forma a verificar a qualidade das constantes obtidas. Conclui-se que é possível utilizar o ensaio da própria peça para caracterizar o material hiperelástico, com resultados comparáveis aos que seriam obtidos com os ensaios típicos para esta aplicação.
The reliable numerical analysis of the mechanical behavior of rubber-like materials depends strongly on accurately calibrated hyperelastic constitutive models. Such models are calibrated by fitting theoretical curves against experimental data obtained in well known tests. In many cases samples of the original elastomer are no longer available or it is impossible to manufacture the specimens required by the standard tests. The aim of this work is verify the possibility of finding the constitutive constants by testing the actual component instead of the usual tensile, compression and shear tests. The proposed approach consists in creating a programming routine with a cost function that, starting from an initial estimate of the constitutive constants, iterate through an optimization algorithm in order to fit the theoretical force × displacement curves to the experimental ones. An automotive component will be used during the studies and two hyperelastic constitutive models will be tested. The nominal stress equations for the hyperelastic models are used to predict the standard tests behavior, to assess the quality of the constants obtained. The results shown that is possible to characterize an hyperelastic material by testing the actual component, with results comparable to those which would be obtained with standard tests.
Advisors/Committee Members: Marczak, Rogerio Jose.
Subjects/Keywords: Hyperelasticity; Elastômeros; Optimization; Elementos finitos; Otimização matemática; Constitutive parameters; Ensaios de materiais; Elastomers; Finite element updating
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APA (6th Edition):
Lancini, E. (2012). Caracterização constitutiva de elastômeros utilizando testes de componentes. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/55462
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lancini, Emmanuel. “Caracterização constitutiva de elastômeros utilizando testes de componentes.” 2012. Thesis, Universidade do Rio Grande do Sul. Accessed October 17, 2019.
http://hdl.handle.net/10183/55462.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lancini, Emmanuel. “Caracterização constitutiva de elastômeros utilizando testes de componentes.” 2012. Web. 17 Oct 2019.
Vancouver:
Lancini E. Caracterização constitutiva de elastômeros utilizando testes de componentes. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2012. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/10183/55462.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lancini E. Caracterização constitutiva de elastômeros utilizando testes de componentes. [Thesis]. Universidade do Rio Grande do Sul; 2012. Available from: http://hdl.handle.net/10183/55462
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queensland University of Technology
22.
Moody, Hayley Ruscoe.
Benchmarking of the biomechanical characteristics of normal and degraded articular cartilage to facilitate mathematical modelling.
Degree: 2006, Queensland University of Technology
URL: https://eprints.qut.edu.au/16402/
► In order to validate the appropriate functional characteristics of cartilage, we need to systematically study and understand what constitutes normality and degradation in cartilage. This…
(more)
▼ In order to validate the appropriate functional characteristics of cartilage, we need to systematically study and understand what constitutes normality and degradation in cartilage. This thesis provides an important step in this direction.
To understand the mechanical repercussions of disruption to the matrix properties, cartilage is often artificially degraded using common enzymes. Although the process of artificial degradation does not provide an accurate representation of osteoarthritis, it can provide insight into the biomechanical properties of single matrix components by examining the behaviour of the tissue following its removal. Through histological analysis utilising the optical absorbance measurements of Safranin O stain, this work has demonstrated that for a given time and enzyme concentration, the action of Trypsin on proteoglycans is highly variable and is dependent on:
* The initial distribution and concentration of proteoglycans at different depths
* The intrinsic sample depth
* The location in the joint space, and
* The medium type.
These findings provide initial data towards a mathematical model which researchers can use to optimise Trypsin treatment of articular cartilage, and therefore model degeneration in vitro with a better degree of certainty.
The variability noted in the distribution and concentration of proteoglycans, and most likely the collagen network, creates a large variation in the compressive and tensile stiffness of all samples, and total failure strain energy. The average values for each of these tests indicate that a loss of proteoglycan through Trypsin treatment results in decreased compressive stiffness, increased tensile stiffness, and little change to the failure strains or total failure strain energy. Conversely, disruption to the collagen network shows increased compressive and tensile stiffness, as well as failure strain and total failure strain energy. Due to the large variation in the results for each treatment group, the average values for the treated samples fall within the range of results for normal cartilage. These values cannot therefore be used as dependable parameters to benchmark cartilage, since the parameters for artificially degraded cartilage are within the normal levels. The Yeoh and Polynomial hyperelastic laws were found to best represent the material characteristics of cartilage across the range of tested samples, regardless of differences in health and strength.
The results presented here provide important insight into the biomechanical outcomes of artificial degradation and provide direction for future research in this area.
Subjects/Keywords: articular cartilage; enzyme degradation; compression; hyperelasticity; fracture mechanics
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APA (6th Edition):
Moody, H. R. (2006). Benchmarking of the biomechanical characteristics of normal and degraded articular cartilage to facilitate mathematical modelling. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/16402/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Moody, Hayley Ruscoe. “Benchmarking of the biomechanical characteristics of normal and degraded articular cartilage to facilitate mathematical modelling.” 2006. Thesis, Queensland University of Technology. Accessed October 17, 2019.
https://eprints.qut.edu.au/16402/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Moody, Hayley Ruscoe. “Benchmarking of the biomechanical characteristics of normal and degraded articular cartilage to facilitate mathematical modelling.” 2006. Web. 17 Oct 2019.
Vancouver:
Moody HR. Benchmarking of the biomechanical characteristics of normal and degraded articular cartilage to facilitate mathematical modelling. [Internet] [Thesis]. Queensland University of Technology; 2006. [cited 2019 Oct 17].
Available from: https://eprints.qut.edu.au/16402/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Moody HR. Benchmarking of the biomechanical characteristics of normal and degraded articular cartilage to facilitate mathematical modelling. [Thesis]. Queensland University of Technology; 2006. Available from: https://eprints.qut.edu.au/16402/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
23.
YANG TAO.
Nonlinear Viscoelastic Properties and Constitutive Modeling of Blood Vessel.
Degree: 2009, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/12954
Subjects/Keywords: Constitutive modeling; Hyperelasticity; Viscoelasticity; Strain dependency; Arterial wall
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APA (6th Edition):
TAO, Y. (2009). Nonlinear Viscoelastic Properties and Constitutive Modeling of Blood Vessel. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/12954
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
TAO, YANG. “Nonlinear Viscoelastic Properties and Constitutive Modeling of Blood Vessel.” 2009. Thesis, National University of Singapore. Accessed October 17, 2019.
http://scholarbank.nus.edu.sg/handle/10635/12954.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
TAO, YANG. “Nonlinear Viscoelastic Properties and Constitutive Modeling of Blood Vessel.” 2009. Web. 17 Oct 2019.
Vancouver:
TAO Y. Nonlinear Viscoelastic Properties and Constitutive Modeling of Blood Vessel. [Internet] [Thesis]. National University of Singapore; 2009. [cited 2019 Oct 17].
Available from: http://scholarbank.nus.edu.sg/handle/10635/12954.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
TAO Y. Nonlinear Viscoelastic Properties and Constitutive Modeling of Blood Vessel. [Thesis]. National University of Singapore; 2009. Available from: http://scholarbank.nus.edu.sg/handle/10635/12954
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Dusfour, Gilles.
Contribution à l’étude de la croissance du disque intervertébral et de cartilage de synthèse. : Contribution to the study of intervertebral disk growth and synthetic cartilage.
Degree: Docteur es, Mécanique et Génie Civil, 2018, Montpellier
URL: http://www.theses.fr/2018MONTS049
► Ce travail de thèse a pour ambition d'apporter une contribution à l'étude de la croissance du disque intervertébral. Il s'inscrit dans un projet de recherche…
(more)
▼ Ce travail de thèse a pour ambition d'apporter une contribution à l'étude de la croissance du disque intervertébral. Il s'inscrit dans un projet de recherche qui vise à développer de nouveaux outils prédictifs afin d'améliorer le traitement de pathologies liées au phénomène de croissance des cartilages et des fibrocartilages. Un second objectif est d'apporter des éléments de compréhension qui pourraient être utiles pour le développement de techniques novatrices d'ingénierie tissulaire.La première partie expérimentale de ce travail consiste en l'identification de propriétés mécanique quasi-statique de l'annulus fibrosus du disque intervertébral, au travers d'une loi de comportement hyperélastique anisotrope, ainsi que d'un champ de déformations résiduelles présent au sein de l'annulus fibrosus, par le biais d'un outil de corrélation d'images numériques. Cette double identification permet à la fois d'estimer le champ de contrainte in vivo de l'annulus fibrosus, mais aussi d'obtenir une trace historique du processus de croissance qui nous servira de référence dans la suite de l'étude.La prise en compte des déformations résiduelles dans un modèle numérique d'annulus fibrosus a permis de constater l’homogénéisation spatiale des déformations lors de chargements physiologiques. Ces résultats soulignent l’importance de la considération des déformations résiduelles dans l’estimation des déformations et des contraintes subies in vivo par l’annulus fibrosus.De plus, un scénario de croissance de l'annulus fibrosus associé à deux critères mécaniques générateurs de croissance ont aussi été implémentés en utilisant la méthode des éléments finis. Les résultats de cette étude numérique n'ont pas permis de reproduire le champ de déformations résiduelles estimé expérimentalement. Seul le modèle de croissance utilisant un critère mécanique anisotrope prenant en compte la direction des fibres présentes dans l’annulus fibrosus et dans le cas d’un chargement omettant volontairement un chargement vertical sur l’annulus fibrosus a permis de reproduire qualitativement les déformations résiduelles tangentielles mesurées expérimentalement.Afin de compléter la compréhension du phénomène de croissance du cartilage, une étude biomécanique d'un modèle in vitro de cartilage de synthèse a mis en évidence l'impact du facteur de croissance TGF-beta3 sur la rigidité de la matrice extra-cellulaire. Une corrélation forte entre les expressions géniques des cellules de cartilage et les propriétés mécaniques de la matrice extra-cellulaire a été trouvée. Cette corrélation forte entre l’activité cellulaire et la rigidité de la matrice extra-cellulaire, couplée à la difficulté des modèles de croissance actuels uniquement basés sur des critères mécaniques, ouvre d’intéressantes perspectives d’études sur la compréhension du phénomène de croissance sous contrainte mécanique. L'étude approfondie de cet échantillon permettra à terme d'enrichir les modèles de croissance afin de prendre en compte les différents phénomènes physiques présent au sein des tissus…
Advisors/Committee Members: Cañadas, Patrick (thesis director).
Subjects/Keywords: Croissance; Déformations résiduelles; Ingénierie tissulaire; Corrélation d'image; Annulus fibrosus; Hyperélasticité; Growth; Residual strains; Tissue engineering; Digital image correlation; Annulus fibrosus; Hyperelasticity
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APA ·
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Export
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APA (6th Edition):
Dusfour, G. (2018). Contribution à l’étude de la croissance du disque intervertébral et de cartilage de synthèse. : Contribution to the study of intervertebral disk growth and synthetic cartilage. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2018MONTS049
Chicago Manual of Style (16th Edition):
Dusfour, Gilles. “Contribution à l’étude de la croissance du disque intervertébral et de cartilage de synthèse. : Contribution to the study of intervertebral disk growth and synthetic cartilage.” 2018. Doctoral Dissertation, Montpellier. Accessed October 17, 2019.
http://www.theses.fr/2018MONTS049.
MLA Handbook (7th Edition):
Dusfour, Gilles. “Contribution à l’étude de la croissance du disque intervertébral et de cartilage de synthèse. : Contribution to the study of intervertebral disk growth and synthetic cartilage.” 2018. Web. 17 Oct 2019.
Vancouver:
Dusfour G. Contribution à l’étude de la croissance du disque intervertébral et de cartilage de synthèse. : Contribution to the study of intervertebral disk growth and synthetic cartilage. [Internet] [Doctoral dissertation]. Montpellier; 2018. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2018MONTS049.
Council of Science Editors:
Dusfour G. Contribution à l’étude de la croissance du disque intervertébral et de cartilage de synthèse. : Contribution to the study of intervertebral disk growth and synthetic cartilage. [Doctoral Dissertation]. Montpellier; 2018. Available from: http://www.theses.fr/2018MONTS049
25.
Laville, Colin.
Caractérisation mécanique et modélisation numérique des tissus de valve aortique : Mechanical characterization and numerical modeling of aortic valve tissues.
Degree: Docteur es, Mécanique numérique et Matériaux, 2017, Paris Sciences et Lettres
URL: http://www.theses.fr/2017PSLEM069
► L’objectif de cette thèse de doctorat est de développer des outils expérimentaux et numériques pour la caractérisation mécanique et la modélisation des tissus, naturels ou…
(more)
▼ L’objectif de cette thèse de doctorat est de développer des outils expérimentaux et numériques pour la caractérisation mécanique et la modélisation des tissus, naturels ou artificiels, de valve aortique. Ces outils sont destinés à être utilisés pour l'élaboration de nouveaux implants biomimétiques en matériaux polymères. Chaque année, près de 300 000 prothèses de valves sont implantées à travers le monde. Ces implants peuvent être de deux types~: mécaniques ou biologiques. Les deux solutions souffrent cependant d'inconvénients majeurs. Dans ce contexte, les prothèses en matériaux polymères représentent une alternative prometteuse même si elles ne disposent pas encore de propriétés mécaniques suffisantes. Dans ce travail, un protocole expérimental combinant essais de traction biaxiale, mesure de champs et microscopie confocale est proposé. La mise au point de nouveaux implants peut aussi largement bénéficier de la modélisation numérique afin d'étudier leur comportement mécanique. Ainsi, un solveur structure et un solveur fluide ont été implémentés et couplés. À partir des résultats expérimentaux, les modèles de comportements ont été calibrés en utilisant une procédure d'analyse inverse.
This PhD thesis aims to develop experimental and numerical tools for the mechanical characterization and the numerical modeling of natural or artificial aortic valve tissues. These tools are intended to be used for the development of new biomimetic polymeric implants. Nowadays, almost 300 000 prosthetic valves are implanted every year worldwide. Two families of prosthetic valves are currently available~: mechanical and biological prostheses. However, both solutions suffer from major drawbacks. In this context, polymeric prostheses represent a promising alternative but currently suffer from insufficient material properties to be suitable for a long – lasting implantation. In this work, an experimental protocol using biaxial tensile tests together with full – field surface measurement and confocal microscopy is proposed. Since numerical simulation is intended to assist the design phase of new implants by predicting their mechanical behavior, a structure and a fluid solver are developed and coupled. Using experimental results, implemented constitutive models are calibrated through an inverse analysis procedure.
Advisors/Committee Members: Tillier, Yannick (thesis director).
Subjects/Keywords: Valve aortique; Mesure de champs; Hyperélasticité; Analyse inverse; Aortic valve; Full-Filed measurement; Hyperelasticity; Inverse analysis; 620.11 Matériaux
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APA (6th Edition):
Laville, C. (2017). Caractérisation mécanique et modélisation numérique des tissus de valve aortique : Mechanical characterization and numerical modeling of aortic valve tissues. (Doctoral Dissertation). Paris Sciences et Lettres. Retrieved from http://www.theses.fr/2017PSLEM069
Chicago Manual of Style (16th Edition):
Laville, Colin. “Caractérisation mécanique et modélisation numérique des tissus de valve aortique : Mechanical characterization and numerical modeling of aortic valve tissues.” 2017. Doctoral Dissertation, Paris Sciences et Lettres. Accessed October 17, 2019.
http://www.theses.fr/2017PSLEM069.
MLA Handbook (7th Edition):
Laville, Colin. “Caractérisation mécanique et modélisation numérique des tissus de valve aortique : Mechanical characterization and numerical modeling of aortic valve tissues.” 2017. Web. 17 Oct 2019.
Vancouver:
Laville C. Caractérisation mécanique et modélisation numérique des tissus de valve aortique : Mechanical characterization and numerical modeling of aortic valve tissues. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres; 2017. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2017PSLEM069.
Council of Science Editors:
Laville C. Caractérisation mécanique et modélisation numérique des tissus de valve aortique : Mechanical characterization and numerical modeling of aortic valve tissues. [Doctoral Dissertation]. Paris Sciences et Lettres; 2017. Available from: http://www.theses.fr/2017PSLEM069
Brno University of Technology
26.
Vyroubal, Petr.
Elektro-hydrodynamický model pro bioimpedanční pletysmografii
.
Degree: 2015, Brno University of Technology
URL: http://hdl.handle.net/11012/43087
► Předkládaná dizertační práce se zabývá studiem elektro-hydrodynamiky v oblasti numerického modelování biomechanických systémů, konkrétně v metodě bioimpedanční pletysmografie. Řešení úlohy pulsujícího proudění krve v pružné…
(more)
▼ Předkládaná dizertační práce se zabývá studiem elektro-hydrodynamiky v oblasti numerického modelování biomechanických systémů, konkrétně v metodě bioimpedanční pletysmografie. Řešení úlohy pulsujícího proudění krve v pružné cévní stěně je v současnosti jeden z nejsložitějších problémů mechaniky a biomechaniky z důvodu interakce obou kontinuí na společné hranici. Celý systém je navíc zatížen procházejícím diagnostickým elektrickým proudem. Tato dizertační práce vznikla ve spolupráci s Ústavem přístrojové techniky AV ČR, v. v. i. v Brně, se skupinou zabývající se medicínskými signály (vedoucí Ing. Pavel Jurák, CSc.). Experimentální měření pak probíhala nezávisle ve Fakultní nemocnici U Svaté Anny v Brně v Mezinárodním centru klinického výzkumu ICRC a Mayo Clinic USA.; This doctoral thesis deals with the study of electro-hydrodynamics in the area of numerical modelling of biomechanical systems, concretely in the method of bioimpedance plethysmography. Solving tasks of pulsatile blood flow in the elastic vessel wall is currently one of the most complicated problem in mechanics and biomechanics due to the interaction of two continua on the common boundary. The whole system is additionally loaded by diagnostic electric current. This doctoral thesis was created in cooperation with the Institute of Scientific Instruments of the CAS, v. v. i. Brno with the team engaged in medical signals (the leader Ing. Pavel Jurák, CSc.). Experimental measurements were made independently in the St. Anne's University Hospital Brno in the International Clinical Research Center ICRC and in the Mayo Clinic USA.
Advisors/Committee Members: Maxa, Jiří (advisor).
Subjects/Keywords: Elektro-hydrodynamika;
bioimpedance;
pletysmograf;
model;
hyperelasticita;
nenewtonská kapalina.;
Electro-hydrodynamics;
bioimpedance;
plethysmograph;
model;
hyperelasticity;
non-newtonian fluid.
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APA ·
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Export
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Manager
APA (6th Edition):
Vyroubal, P. (2015). Elektro-hydrodynamický model pro bioimpedanční pletysmografii
. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/43087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vyroubal, Petr. “Elektro-hydrodynamický model pro bioimpedanční pletysmografii
.” 2015. Thesis, Brno University of Technology. Accessed October 17, 2019.
http://hdl.handle.net/11012/43087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vyroubal, Petr. “Elektro-hydrodynamický model pro bioimpedanční pletysmografii
.” 2015. Web. 17 Oct 2019.
Vancouver:
Vyroubal P. Elektro-hydrodynamický model pro bioimpedanční pletysmografii
. [Internet] [Thesis]. Brno University of Technology; 2015. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/11012/43087.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vyroubal P. Elektro-hydrodynamický model pro bioimpedanční pletysmografii
. [Thesis]. Brno University of Technology; 2015. Available from: http://hdl.handle.net/11012/43087
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brno University of Technology
27.
Máša, Bohuslav.
Numerické modelování chování částicového kompozitu se sesíťovanou polymerní matricí
.
Degree: 2011, Brno University of Technology
URL: http://hdl.handle.net/11012/4260
► Diplomová práce se zabývá stanovením makroskopického chování částicového kompozitu se sesíťovanou polymerní matricí zatíženého tahem. Hlavním cílem práce je určení mechanických vlastností kompozitu při tahovém…
(more)
▼ Diplomová práce se zabývá stanovením makroskopického chování částicového kompozitu se sesíťovanou polymerní matricí zatíženého tahem. Hlavním cílem práce je určení mechanických vlastností kompozitu při tahovém zatížení za pomocí numerických metod (zejména metody konečných prvků). Vyšetřovaný kompozit je složen z matrice v kaučukovitém stavu a z tuhých částic na bázi oxidu hliníku (Al2O3). Hyperelastické vlastnosti matrice byly popsány pomocí Mooney-Rivlinova modelu materiálu. V úvahu byly brány různé konfigurace rozmístění částic, jejich odlišný tvar, orientace a rozlišné objemové množství, pro něž byly vytvořeny numerické modely, přičemž bylo vzato do úvahy také porušování matrice kompozitu. Výsledky výpočtů jsou porovnány s experimentálními daty, přičemž byla konstatována dobrá shoda mezi numerickými modely s porušováním matrice a experimentálními daty.; The master's thesis deals with the determination of macroscopic behavior of a particulate composite with cross-linked polymer matrix under tensile load. The main focus of thesis is estimation of mechanical properties of a composite loaded by tensile loading using numerical methods (especially finite elements method). Investigated composite is composed of matrix in a rubbery state filled by alumina-based particles (Al2O3). Hyperelastic properties of the matrix have been modeled by the Mooney-Rivlin material model. Different compositions of particles, their different shape, orientation and different volume fractions have been considered. For all these characteristics of composite numerical models have been developed. The damage mechanisms of the matrix have also been taken into account. Results of numerical analyses have been compared with experimental data and good agreement between numerical models with damage mechanisms of matrix and experimental data has been found.
Advisors/Committee Members: Náhlík, Luboš (advisor).
Subjects/Keywords: sesíťovaný polymer;
částicový kompozit;
MKP;
hyperelasticita;
Mooney-Rivlin;
cross-linked polymer;
particulate composite;
FEM;
hyperelasticity;
Mooney-Rivlin
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APA (6th Edition):
Máša, B. (2011). Numerické modelování chování částicového kompozitu se sesíťovanou polymerní matricí
. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/4260
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Máša, Bohuslav. “Numerické modelování chování částicového kompozitu se sesíťovanou polymerní matricí
.” 2011. Thesis, Brno University of Technology. Accessed October 17, 2019.
http://hdl.handle.net/11012/4260.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Máša, Bohuslav. “Numerické modelování chování částicového kompozitu se sesíťovanou polymerní matricí
.” 2011. Web. 17 Oct 2019.
Vancouver:
Máša B. Numerické modelování chování částicového kompozitu se sesíťovanou polymerní matricí
. [Internet] [Thesis]. Brno University of Technology; 2011. [cited 2019 Oct 17].
Available from: http://hdl.handle.net/11012/4260.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Máša B. Numerické modelování chování částicového kompozitu se sesíťovanou polymerní matricí
. [Thesis]. Brno University of Technology; 2011. Available from: http://hdl.handle.net/11012/4260
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
28.
Ta, Anh Tuan.
Modélisation de lois de comportement anisotropes par la théorie mathématique des invariants : application aux matériaux biologiques fibreux : Modeling of anisotropic behaviour laws by the mathematical theory of invariants : Application to biological tissues with fibers.
Degree: Docteur es, Mécanique, 2014, Belfort-Montbéliard
URL: http://www.theses.fr/2014BELF0236
► Les travaux de cette thèse s’inscrivent dans le cadre de la formalisation mathématique des lois de comportement de matériaux anisotropes permettant de modéliser les tissus…
(more)
▼ Les travaux de cette thèse s’inscrivent dans le cadre de la formalisation mathématique des lois de comportement de matériaux anisotropes permettant de modéliser les tissus organiques (ligaments, muscles, tendons, parois artérielles …), les caoutchoucs renforcés par des fibres ou encore les composites textiles utilisés en aéronautique ou en génie civil. A partir des années 1950, l’utilisation de la théorie des invariants a été intensivement étudiée dans le cadre de la mécanique des milieux continus et plusieurs familles d’invariants ont alors été proposées. Cependant, l’utilisation de ces invariants soulève plusieurs difficultés :• Il en existe une grande diversité, ce qui ne facilite pas leur choix dans le cadre d’une modélisation éléments finis,• Certains sont difficiles à interpréter physiquement,• Ils nécessitent souvent la superposition deux densités d’énergie : l’une pour la description du comportement isotrope et l’autre pour la description du comportement purement anisotrope.Pour surmonter ces difficultés, une méthode constructive a été récemment proposée par Thionnet et al. Elle permet de s'assurer de l'unicité (à une relation près) de l'écriture polynômiale des invariants. Nous avons adapté cette méthode au cas des matériaux hyperélastiques anisotropes dans les cas d’un matériau constitué de deux familles puis d’une seule famille de fibre de collagène. Dans le premier cas, le théorème de Noether et l’opérateur de Reynolds ont été employés. Le second cas est techniquement plus complexe à aborder car le groupe de symétrie matérielle n’est plus de cardinal fini. L’opérateur de Reynolds n’a alors plus de sens et le théorème de Noether n’est plus applicable. Pour pallier cette situation, nous avons introduit un opérateur de Reynolds généralisé et avons montré que les propriétés associées à ce nouvel opérateur constituaient une extension de l’opérateur classique. Dans les deux cas, nous avons réussi à exhiber une base d’intégrité constituée d’invariants qui, pour certains, se démarquent de ceux classiquement trouvés dans la littérature.En particulier, dans le cas d’une famille de fibre, nous avons pu établir, grâce au théorème de Kantorovich, que l’un de ces invariants était relié au maximum de l’angle de cisaillement entre la fibre et la matrice.
This thesis concerns a mathematical formulation of anisotropic behavior laws for the modeling of biological soft tissues (such as ligaments, muscle, tendons or arterial walls), fibers reinforced rubbers and textile composites used in aeronautical industry or for civil engineering applications. From the fifties, the theory of invariants was extensively developped in the framework of continuum mechanics and several families of invariants were proposed. However the use of these invariants meets some problems:• Because of a wide diversity, it is uneasy to well choose them in order to perform a finite element analysis.• It is difficult to give a physical meaning to some of them.• They often require the superposition of two strain energy densities: one for the description…
Advisors/Committee Members: Peyraut, François (thesis director), Labed, Nadia (thesis director), Holweck, Frédéric (thesis director).
Subjects/Keywords: Théorie mathématiques des invariants; Loi de comportement biomécanique; Tissu biologique; Hyperélasticité; Theory of mathematics invariants; Biomechanics behaviour law; Biological tissu; Hyperelasticity
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APA ·
Chicago ·
MLA ·
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CSE |
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Manager
APA (6th Edition):
Ta, A. T. (2014). Modélisation de lois de comportement anisotropes par la théorie mathématique des invariants : application aux matériaux biologiques fibreux : Modeling of anisotropic behaviour laws by the mathematical theory of invariants : Application to biological tissues with fibers. (Doctoral Dissertation). Belfort-Montbéliard. Retrieved from http://www.theses.fr/2014BELF0236
Chicago Manual of Style (16th Edition):
Ta, Anh Tuan. “Modélisation de lois de comportement anisotropes par la théorie mathématique des invariants : application aux matériaux biologiques fibreux : Modeling of anisotropic behaviour laws by the mathematical theory of invariants : Application to biological tissues with fibers.” 2014. Doctoral Dissertation, Belfort-Montbéliard. Accessed October 17, 2019.
http://www.theses.fr/2014BELF0236.
MLA Handbook (7th Edition):
Ta, Anh Tuan. “Modélisation de lois de comportement anisotropes par la théorie mathématique des invariants : application aux matériaux biologiques fibreux : Modeling of anisotropic behaviour laws by the mathematical theory of invariants : Application to biological tissues with fibers.” 2014. Web. 17 Oct 2019.
Vancouver:
Ta AT. Modélisation de lois de comportement anisotropes par la théorie mathématique des invariants : application aux matériaux biologiques fibreux : Modeling of anisotropic behaviour laws by the mathematical theory of invariants : Application to biological tissues with fibers. [Internet] [Doctoral dissertation]. Belfort-Montbéliard; 2014. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2014BELF0236.
Council of Science Editors:
Ta AT. Modélisation de lois de comportement anisotropes par la théorie mathématique des invariants : application aux matériaux biologiques fibreux : Modeling of anisotropic behaviour laws by the mathematical theory of invariants : Application to biological tissues with fibers. [Doctoral Dissertation]. Belfort-Montbéliard; 2014. Available from: http://www.theses.fr/2014BELF0236
29.
Nguessong Nkenfack, Alain.
Modélisation ds matériaux caoutchouteux par une nouvelle densité hyperélastique isotrope hybride - Théorie et implémentation éléments finis : Modeling of rubber materials with a new hybrid isotropic hyperelastic density – Theory and finite element implementation.
Degree: Docteur es, Sciences Pour l'Ingénieur, 2015, Belfort-Montbéliard; Université de Ngaoundéré
URL: http://www.theses.fr/2015BELF0257
► Les travaux de cette thèse ont porté sur le développement d’une nouvelle loi de comportement hyperélastique, isotrope et incompressible permettant de modéliser les matériaux caoutchouteux…
(more)
▼ Les travaux de cette thèse ont porté sur le développement d’une nouvelle loi de comportement hyperélastique, isotrope et incompressible permettant de modéliser les matériaux caoutchouteux en grande déformation et en grand déplacement. Cette nouvelle loi combine une approche moléculaire et une approche phénoménologique, ce qui permet de couvrir un spectre large de sollicitations. Elle est constituée par la superposition de quatre termes :– un terme lié à la contrainte d’entrelacement des chaînes macromoléculaires observée avec le phénomène de cristallisation. Ce terme est modélisé par une fonction logarithmique provenant de l’énergie phénoménologique de Gent-Thomas,– un terme lié à l’hypothèse des déformations affines observées avec le raidissement final de certaines chaînes macromoléculaires des élastomères. Ce terme provient de la probabilité non-Gaussienne de Langevin. Nous l‘avons modélisé par la loi moléculaire 8-chaines d’Arruda-Boyce avec un aménagement qui consiste à utiliser une approximation originale de la fonction de Langevin inverse,– un terme lié à la contrainte des chaînes ayant des déformations non-affines. Ce terme est modélisé par une fonction Gaussienne sous forme intégrale. Il s’agit de l’une des contributions originale de ce travail de thèse,– une partie volumique standard permettant de prendre en compte l’incompressibilité du matériau.Les deux principales originalités de la thèse concernent donc l’élaboration d’une approximation inédite de la fonction de Langevin inverse ainsi que la construction d’une nouvelle densité d’énergie hyperélastique isotrope, incompressible et hybride.Afin d’étudier la pertinence du modèle proposé, des comparaisons ont été réalisées avec plusieurs jeux de données expérimentales disponibles dans la littérature. Ces comparaisons ayant été couronnées de succès, l’implémentation numérique du modèle que nous proposons a été effectuée dans le code universitaire aux éléments finis FER.
This thesis concerns the development of a new incompressible isotropic hyperelastic behavior law allowing the modeling of rubber materials with large strain and large displacement. This new law mixes a molecular approach with a phenomenological one and therefore covers a wide range of loading. It has been built by a sum over four terms:– a term related to the interleaving macromolecular chains observed with the crystallization phenomenon. This term is modeled by a logarithmic function coming from the phenomenological energy of Gent-Thomas,– a term related to the assumption of affine deformations observed with the final stiffening of a part of macromolecular elastomeric chains. This term comes from the non Gaussian probability of Langevin. We have modeled it by the 8-chains molecular law of Arruda-Boyce but with an original approximation of the inverse of the Langevin function,– a term related to the stress occurring with non affine strains. This term has been modeled by a Gaussian function adopting an integral form. This is one of the original contribution of this thesis work,– a classical…
Advisors/Committee Members: Peyraut, François (thesis director), Beda, Tibi (thesis director).
Subjects/Keywords: Elastomères; Grandes déformations; Hyperélasticité; Implémentation des éléments finis; Rubber-like material; Large strain; Hyperelasticity; Finite Element implementation
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APA ·
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MLA ·
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CSE |
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APA (6th Edition):
Nguessong Nkenfack, A. (2015). Modélisation ds matériaux caoutchouteux par une nouvelle densité hyperélastique isotrope hybride - Théorie et implémentation éléments finis : Modeling of rubber materials with a new hybrid isotropic hyperelastic density – Theory and finite element implementation. (Doctoral Dissertation). Belfort-Montbéliard; Université de Ngaoundéré. Retrieved from http://www.theses.fr/2015BELF0257
Chicago Manual of Style (16th Edition):
Nguessong Nkenfack, Alain. “Modélisation ds matériaux caoutchouteux par une nouvelle densité hyperélastique isotrope hybride - Théorie et implémentation éléments finis : Modeling of rubber materials with a new hybrid isotropic hyperelastic density – Theory and finite element implementation.” 2015. Doctoral Dissertation, Belfort-Montbéliard; Université de Ngaoundéré. Accessed October 17, 2019.
http://www.theses.fr/2015BELF0257.
MLA Handbook (7th Edition):
Nguessong Nkenfack, Alain. “Modélisation ds matériaux caoutchouteux par une nouvelle densité hyperélastique isotrope hybride - Théorie et implémentation éléments finis : Modeling of rubber materials with a new hybrid isotropic hyperelastic density – Theory and finite element implementation.” 2015. Web. 17 Oct 2019.
Vancouver:
Nguessong Nkenfack A. Modélisation ds matériaux caoutchouteux par une nouvelle densité hyperélastique isotrope hybride - Théorie et implémentation éléments finis : Modeling of rubber materials with a new hybrid isotropic hyperelastic density – Theory and finite element implementation. [Internet] [Doctoral dissertation]. Belfort-Montbéliard; Université de Ngaoundéré; 2015. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2015BELF0257.
Council of Science Editors:
Nguessong Nkenfack A. Modélisation ds matériaux caoutchouteux par une nouvelle densité hyperélastique isotrope hybride - Théorie et implémentation éléments finis : Modeling of rubber materials with a new hybrid isotropic hyperelastic density – Theory and finite element implementation. [Doctoral Dissertation]. Belfort-Montbéliard; Université de Ngaoundéré; 2015. Available from: http://www.theses.fr/2015BELF0257
30.
Cai, Renye.
Original strain energy density functions for modeling of anisotropic soft biological tissue : Méthodes éléments finis avancées appliquées à la modélisation de tissus biologiques en biomécanique.
Degree: Docteur es, Mécanique, 2017, Bourgogne Franche-Comté
URL: http://www.theses.fr/2017UBFCA003
► Cette thèse a porté sur la construction de densités d'énergie de déformation permettant de décrire le comportement non linéaire de matériaux anisotropes tels que les…
(more)
▼ Cette thèse a porté sur la construction de densités d'énergie de déformation permettant de décrire le comportement non linéaire de matériaux anisotropes tels que les tissus biologiques souples (ligaments, tendons, parois artérielles etc.) ou les caoutchoucs renforcés par des fibres. Les densités que nous avons proposées ont été élaborées en se basant sur la théorie mathématique des polynômes invariants et notamment sur le théorème de Noether et l'opérateur de Reynolds. Notre travail a concerné deux types de matériaux anisotropes, le premier avec une seule famille de fibre et le second avec quatre familles. Le concept de polyconvexité a également été étudié car il est notoire qu'il joue un rôle important pour s'assurer de l'existence de solutions. Dans le cas d'un matériau comportant une seule famille de fibre, nous avons démontré qu'il était impossible qu'une densité polynomiale de degré quelconque puisse prédire des essais de cisaillement avec un chargement parallèle puis perpendiculaire à la direction des fibres. Une densité polynomiale linéaire combinée avec une fonction puissance a permis de contourner cet obstacle. Dans le cas d'un matériau comportant quatre familles de fibre, une densité polynomiale a permis de prédire correctement des résultats d'essai en traction bi-axiale extraits de la littérature. Les deux densités proposées ont été implémentées avec la méthode des éléments finis et en langage C++ dans le code de calcul universitaire FER. Pour se faire, une formulation lagrangienne totale a été adoptée. L'implémentation a été validée par des comparaisons avec des solutions analytiques de référence que nous avons exhibée dans le cas de chargements simples conduisant à des déformations homogènes. Des exemples tridimensionnels plus complexes, impliquant des déformations non-homogènes, ont également été étudiés.
This thesis has focused on the construction of strain energy densities for describing the non-linear behavior of anisotropic materials such as biological soft tissues (ligaments, tendons, arterial walls, etc.) or fiber-reinforced rubbers. The densities we have proposed have been developed with the mathematical theory of invariant polynomials, particularly the Noether theorem and the Reynolds operator. Our work involved two types of anisotropic materials, the first with a single fiber family and the second with a four-fiber family. The concept of polyconvexity has also been studied because it is well known that it plays an important role for ensuring the existence of solutions. In the case of a single fiber family, we have demonstrated that it is impossible for a polynomial density of any degree to predict shear tests with a loading parallel and then perpendicular to the direction of the fibers. A linear polynomial density combined with a power-law function allowed to overcome this problem. In the case of a material made of a four-fiber family, a polynomial density allowed to correctly predict bi-axial tensile test data extracted from the literature. The two proposed densities were implemented in C++…
Advisors/Committee Members: Peyraut, François (thesis director), Feng, Zhi-Qiang (thesis director), Holweck, Frédéric (thesis director).
Subjects/Keywords: Méthodes éléments finis; Modélisation; Tissus biologiques; Biomécanique; Hypérelasticité anisotrope; Finite element methods; Modeling; Soft biological tissue; Biomechanical; Anisotropic hyperelasticity; 571.43
Record Details
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Record Details
Similar Records
Cite
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cai, R. (2017). Original strain energy density functions for modeling of anisotropic soft biological tissue : Méthodes éléments finis avancées appliquées à la modélisation de tissus biologiques en biomécanique. (Doctoral Dissertation). Bourgogne Franche-Comté. Retrieved from http://www.theses.fr/2017UBFCA003
Chicago Manual of Style (16th Edition):
Cai, Renye. “Original strain energy density functions for modeling of anisotropic soft biological tissue : Méthodes éléments finis avancées appliquées à la modélisation de tissus biologiques en biomécanique.” 2017. Doctoral Dissertation, Bourgogne Franche-Comté. Accessed October 17, 2019.
http://www.theses.fr/2017UBFCA003.
MLA Handbook (7th Edition):
Cai, Renye. “Original strain energy density functions for modeling of anisotropic soft biological tissue : Méthodes éléments finis avancées appliquées à la modélisation de tissus biologiques en biomécanique.” 2017. Web. 17 Oct 2019.
Vancouver:
Cai R. Original strain energy density functions for modeling of anisotropic soft biological tissue : Méthodes éléments finis avancées appliquées à la modélisation de tissus biologiques en biomécanique. [Internet] [Doctoral dissertation]. Bourgogne Franche-Comté; 2017. [cited 2019 Oct 17].
Available from: http://www.theses.fr/2017UBFCA003.
Council of Science Editors:
Cai R. Original strain energy density functions for modeling of anisotropic soft biological tissue : Méthodes éléments finis avancées appliquées à la modélisation de tissus biologiques en biomécanique. [Doctoral Dissertation]. Bourgogne Franche-Comté; 2017. Available from: http://www.theses.fr/2017UBFCA003
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