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Dissertations / Theses on the topic 'Hyperelastic'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Patil, Amit. "Inflation Mechanics of Hyperelastic Membranes." Licentiate thesis, KTH, Strukturmekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160707.

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The applications of inflatable membrane structures are increasing rapidly in the various fields of engineering and science. The geometric, material, force and contact non-linearities complicate this subject further, which in turn increases the demand for computationally efficient methods and interpretations of counter-intuitive behaviors noted by the scientific community. To understand the complex behavior of membranes in biological and medical engineering contexts, it is necessary to understand the mechanical behavior of a membrane from a physics point of view. The first part of the presen

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2

Bang, Dongjun. "Peridynamic Modeling of Hyperelastic Materials." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/595809.

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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 equi

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3

Jing, Xiamei. "On deformations of compressible hyperelastic material." Thesis, University of Glasgow, 1998. http://theses.gla.ac.uk/1080/.

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We consider the character of several finite deformations of compressible isotropic, nonlinear hyperelastic materials, specifically azimuthal shear of a thick-walled circular cylindrical tube, the bending deformation of a rectangular block and axial shear of a thick-walled circular cylindrical tube. For each problem the equilibrium equations are applied to the special case of isochoric deformation, and explicit necessary and sufficient conditions on the strain-energy function for the material to admit such a deformation are obtained. These conditions are examined for several strain-energy funct

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4

Patil, Amit. "Inflation and Instabilities of Hyperelastic Membranes." Doctoral thesis, KTH, Mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187041.

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The applications of membranes are increasing rapidly in various fields of engineering and science. The geometric, material, force and contact non-linearities complicate their analysis, which increases the demand for computationally efficient methods and interpretation of counter-intuitive behaviours. The first part of the present work studies the free and constrained inflation of circular and cylindrical membranes. The membranes are assumed to be in contact with a soft substrate, modelled as a linear spring distribution.Adhesive and frictionless contact conditions are considered during inflati

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5

Hildebrandt, Edward Allan. "Normal uniform deformations of monotropic hyperelastic rods." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0006/MQ45059.pdf.

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6

Kaden, Jason. "Computational simulations of fiber reinforced hyperelastic materials." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101148.

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Incompressible hyperelastic materials are used extensively in construction and manufacturing and are often reinforced with fibers aligned in a single direction. There are numerous mathematical constitutive models that are used to model the behavior of hyperelastic materials but few of them have been accurately applied to reinforced hyperelastic materials. The goal of this work is to develop a simple model that will allow a researcher to predict the effective shear modulus of a reinforced hyperelastic material in plane strain and model the material as if it were a homogenous material. A series

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7

Kudová, Šárka. "Deformačně-napěťová analýza spojení tepny s cévní protézou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228332.

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8

Kassianidis, Fotios. "Boundary-value problems for transversely isotropic hyperelastic solids." Thesis, University of Glasgow, 2007. http://theses.gla.ac.uk/20/.

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In this thesis we examine three boundary-value problems combined with the presence of dead-load tractions in respect of transersely isotropic elastic materials. In particular, Chapter 1 mainly consists of existing preliminary remarks on the continuum (phenomenological) approach used here to study the mechanical response of elastic materials under large strains. More specifically, we discuss, always within the continuous framework, basic kinematical concepts, fundamental stress principles as well as balance laws; those also being appropriately specialized for material bodies under the state of

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9

OtteÌnio, MeÌlanie. "Waves and surface stability in predeformed hyperelastic solids." Thesis, University of Glasgow, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439129.

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10

Saunders, Richard A. "Nonlinear Dynamic Analysis of Structures with Hyperelastic Devices." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/42691.

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This thesis presents the results of an investigation of a multiple degree of freedom (MDOF) structure with hyperelastic bracing using nonlinear and incremental dynamic analysis. New analytical software is implemented in the investigation of the structure, and the study seeks to investigate the effectiveness of hyperelastic bracing as a seismic protection device. Hyperelastic braces incorporate a new idea of a nonlinear elastic material that gains stiffness as the brace deforms. Structural behaviors of particular concern for an MDOF frame are stability, residual displacement, base shear, and

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11

Wadham-Gagnon, Matthew. "Hyperelastic modelling of rubber behaviour in finite element software." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99797.

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Experimental characterisation of rubber in uniaxial, equi-biaxial and planar tension under cyclic quasi-static loading shows strain-induced stress softening, hysteresis and unrecoverable strain. The objective of this work is to study the applications and limitations involved in predicting the behaviour of rubber with hyperelastic models. To assume a preconditioned perfectly elastic material, the data obtained from experiments must first be simplified. The data is then fitted to popular hyperelastic models in the finite element analysis (FEA) software ANSYS(TM). A single hyperelastic model (wit

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12

Smith, Kevin. "Fracture Toughness of a Hyperelastic Material During Surgical Cutting." Honors in the Major Thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1564.

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Despite being one of the most important organs of vertebrates, the material properties of skin are also one of the most poorly understood. In the field of designing medical devices and surgical tools there are significant advantages to having a model that describes the interaction of forces between a blade tip and skin during surgical cutting. In general, skin can best be described as a composite layer consisting of a viscoelastic dermis with interwoven collagen and elastin fibers beneath a superficial epidermis. The purpose of this research is to study the fracture toughness of porcine skin d

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13

PAULA, GUILHERME RODRIGUES SAMPAIO DE. "NUMERICAL AND EXPERIMENTAL ENDENTATION ANALYSIS OF PLANE HYPERELASTIC MEMBRANES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23866@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>O estudo do comportamento de membranas quando expostas a pressões e tensões de diverssos tipos, assim como de suas propriedades mecânicas nos últimos anos vem recebendo uma notável atenção em razão da variada aplicabilidade das membranas nas mais diversas áreas da engenharia, incluindo atuadores, robótica, sensores, aeroespacial, bioengenharia e estruturas infláveis para engenharia civil. Neste trabalho será apresentado um estudo numérico e experimental de uma membrana sujeita a uma endentação e perfuração transversalmente ao seu plano inde

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14

Elgström, Eskil. "Practical implementation of hyperelastic material methods in FEA models." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5654.

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This thesis will be focusing on studies about the hyperelastic material method and how to best implement it in a FEA model. It will look more specific at the Mooney-Rivlin method, but also have a shorter explanation about the different methods. This is due to problems Roxtec has today about simulating rubber takes long time, are instable and unfortunately not completely trustworthy, therefore a deep study about the hyperelastic material method were chosen to try and address these issuers. The Mooney-Rivlin method (which is a part of the hyperelastic material method) is reliant on a few constan

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15

Ruiz, Antonio Javier Gil. "Structural analysis of prestressed Saint Venant-Kirchhoff hyperelastic membranes." Thesis, Swansea University, 2004. https://cronfa.swan.ac.uk/Record/cronfa43130.

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A total Lagrangian formulation for prestressed structural membranes is described. The kinematics of prestressed membranes is displayed as a series of three successive configurations, namely, a nominally stressed initial equilibrium state <i>R</i><sub>0</sub>, a prestressed state <i>R</i><sub>pret</sub> and a final in-service state <i>R</i>, for the time instants t<sup>0</sup>, t<sup>pret</sup><sub> </sub>and t, respectively. Kinematic entities are fully derived, i.e., deformations gradient tensor, displacement gradient tensor, right Cauchy-Green tensor or Green-Lagrange strain tensor. Among th

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16

Chittur, Krishna Murthy Anantha Narayan. "Application of visco-hyperelastic devices in structural response control." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/32910.

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Structural engineering has progressed from design for life safety limit states to performance based engineering, in which energy dissipation systems in structural frameworks assume prime importance. A visco-hyperelastic device is a completely new type of passive energy dissipation system that not only combines the energy dissipation properties of velocity and displacement dependent devices but also provides additional stability to the structure precluding overall collapse. The device consists of a viscoelastic material placed between two steel rings. The energy dissipation in the device is d

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17

Staber, Brian. "Stochastic analysis, simulation and identification of hyperelastic constitutive equations." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1042/document.

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Le projet de thèse concerne la construction, la génération et l'identification de modèles continus stochastiques, pour des milieux hétérogènes exhibant des comportements non linéaires. Le domaine d'application principal visé est la biomécanique, notamment au travers du développement d'outils de modélisation multi-échelles et stochastiques, afin de quantifier les grandes incertitudes exhibées par les tissus mous. Deux aspects sont particulièrement mis en exergue. Le premier point a trait à la prise en compte des incertitudes en mécanique non linéaire, et leurs incidences sur les prédictions des

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18

Jakel, Roland. "Analysis of Hyperelastic Materials with Mechanica - Theory and Application Examples." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000705.

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Part 1: Theoretic background information - Review of Hooke’s law for linear elastic materials - The strain energy density of linear elastic materials - Hyperelastic material - Material laws for hyperelastic materials - About selecting the material model and performing tests - Implementation of hyperelastic material laws in Mechanica - Defining hyperelastic material parameters in Mechanica - Test set-ups and specimen shapes of the supported material tests - The uniaxial compression test - Stress and strain definitions in the Mechanica LDA analysis Part 2: Application examples - A test specimen

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19

LOPES, STEFANE RODRIGUES XAVIER. "NON-LINEAR BEHAVIOR AND INSTABILITY OF HYPERELASTIC MEMBRANES AND SHELLS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4414@1.

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Esta tese tem como objetivo analisar o comportamento estático não-linear e possíveis instabilidades de membranas e cascas hiperelásticas. Uma análise experimental detalhada de membranas e cascas com diferentes geometrias e submetidas à tração axial e pressão interna uniforme é realizada. Um aparato foi desenvolvido para possibilitar a tração da estrutura enquanto a mesma era preenchida por ar. As cascas e membranas utilizadas na análise experimental são compostas por elastômero isotrópico, homogêneo e hiperelástico, o qual é modelado como um material Neo- Hookeano incompressível, descri

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20

Shaheen, Robert. "Design and Material Characterization of a Hyperelastic Tubular Soft Composite." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36117.

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Research within the field of human motion assistive device development, with the purpose of reducing the metabolic cost of daily activities, is seeing the benefits of the exclusive use of passive actuators to store and release energy during the gait cycle. Designs of novel exoskeletons at the University of Ottawa implement the Pneumatic Artificial Muscle (PAM) as the primary method of nonlinear, passive actuation. The PAM is proven as a superior actuator for these devices when compared to the linear mechanical springs used by other researchers. There are, however, challenges regarding PAM

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21

Tabakci, Alican. "Mechanical Properties Identification Of Viscoelastic / Hyperelastic Materials Based On Experimental Data." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612634/index.pdf.

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Mechanical simulation of viscoelastic materials and assigning a viscoelastic material to the modeled parts in the simulations are difficult task. For the simulations, material model should be well chosen and material coefficients of the chosen models should be known. In order to obtain accurate simulations, hyperelastic characteristics of the viscoelastic materials should be investigated and hyperelastic model should be incorporated in the solutions. Material models and material model&rsquo<br>s coefficients are chosen with the help of mechanical tests/experiments for these situations. The mai

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22

Ferranto, Justin. "Experimental characterization and FEA simulation of hyperelastic membranes under large deformation." abstract and full text PDF (free order & download UNR users only), 2005. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1436029.

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23

Zhu, Yunfei. "Nonlinear deformations of a thick-walled hyperelastic tube under external pressure." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/1627/.

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This research deals with several novel aspects of the nonlinear behaviour of thick-walled cylindrical hyperelastic tubes under external pressure. Initially, we consider bifurcation from a circular cylindrical deformed configuration of a thick-walled circular cylindrical tube of incompressible isotropic elastic material subject to combined axial loading and external pressure. In particular, we examine both axisymmetric and asymmetric modes of bifurcation. The analysis is based on the three-dimensional incremental equilibrium equations, which are derived and then solved numerically for a specifi

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24

Chuah, Meng Yee (Meng Yee Michael). "Composite force sensing foot utilizing volumetric displacement of a hyperelastic polymer." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78211.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 65-67).<br>In this thesis, I will describe the fabrication and characterization of a footpad based on an original principle of volumetric displacement sensing. It is intended for use in detecting ground contact forces in a running quadrupedal robot. The f

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25

Salvetti, Matteo Francesco. "Hyperelastic continuum modeling of cubic crystals based on first-principles calculations." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62517.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 363-381).<br>We propose new constitutive equations that capture the low-temperature hyperelastic response of cubic-symmetry single crystals up to large volumetric and deviatoric deformations in the region of stability of the equilibrium crystal phase. For the first time, we combine the formalism of continuum mechanics invariant theory with the predictive capability of quantum mechanics to model the hyperelastic respon

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26

Hu, Lianxin. "Micromechanics of granular materials : Modeling anisotropy by a hyperelastic-plastic model." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI133.

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Afin de modéliser le comportement des géométariaux sous des charges complexes, plusieurs études et travaux expérimentaux ont été réalisées afin d’établir des modèles constitutifs relatifs. Une caractéristique importante des matériaux granulaires est que la relation entre la contrainte et la déformation et ce même dans le domaine élastique n’est pas linéaire, contrairement aux réponses du métal. Il a également été constaté que la réponse contrainte-déformation des matériaux granulaires montre les caractéristiques de l’anisotropie induite, ainsi que les non-linéarités. En outre, l’anisotropie in

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27

Francisco, Geethamala Sarojini. "Effects of bending stiffness on localized bulging in a pressurized hyperelastic tube." Thesis, Keele University, 2016. http://eprints.keele.ac.uk/2365/.

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The problem of localised bulging in inflated thin-walled tubes has been studied by many authors. In all these studies, the strain-energy function is expressed only in term of principal stretches. However, there are some applications where the cylindrical tube concerned may have walls thick enough so that the membrane theory may become invalid. One such situation that motivates the present study is the mathematical modeling of aneurysm initiation; in that context the human arteries exhibit noticeable bending stiffness. The effects of bending stiffness on localized bulging are studied using two

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28

Seki, Wataru. "Analysis of strain localization in hyperelastic materials, using assumed stress hybrid elements." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/19088.

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29

Behroozinia, Pooya. "Finite Element Analysis of Defects in Cord-Rubber Composites and Hyperelastic Materials." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/87703.

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In recent years, composite materials have been widely used in several applications due to their superior mechanical properties including high strength, high stiffness, and low density. Despite the remarkable advancements in theoretical and computational methods for analyzing composites, investigating the effect of lamina properties and lay-up configurations on the strength of composites still remains an active field of research. Finite Element Method (FEM) and Extended Finite Element Method (XFEM) are powerful tools for solving the boundary value problems. One of the objectives of this work is

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30

Luo, Ke. "On the Application of CISAMR for Modeling Hyperelastic Materials Undergoing Finite Deformation." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525442256935631.

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31

Speirs, Derek C. D. "Characterisation of materials with hyperelastic microstructures through computational homogenisation and optimisation methods." Thesis, Swansea University, 2007. https://cronfa.swan.ac.uk/Record/cronfa42354.

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The constitutive modelling of microheterogeneous materials is a subject of considerable practical and theoretical interest. Among many approaches computational homogenisation is particularly powerful and versatile. This is based on the numerical estimation of the mechanical response of a volume element representing the material's microstructure. This thesis is concerned with computational homogenisation and its particular use in characterising materials with hyperelastic microstructures through an optimisation based methodology. Details of a finite element implementation of the computational h

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32

Österlöf, Rickard. "Modelling of the Fletcher-Gent effect and obtaining hyperelastic parameters for filled elastomers." Licentiate thesis, KTH, MWL Strukturakustik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-151304.

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The strain amplitude dependency , i.e. the Fletcher-Gent effect and Payne effect, and the strain rate dependency of rubber with reinforcing fillers is modelled using a modified boundary surface model and implemented uniaxially. In this thesis, a split of strain instead of stress is utilized, and the storage and loss modulus are captured over two decades of both strain amplitudes and frequencies. In addition, experimental results from bimodal excitation are replicated well, even though material parameters were obtained solely from harmonic excitation. These results are encouraging since the sup

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33

Argyridou, Eleni. "Estimating errors in quantities of interest in the case of hyperelastic membrane deformation." Thesis, Brunel University, 2018. http://bura.brunel.ac.uk/handle/2438/16205.

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There are many mathematical and engineering methods, problems and experiments which make use of the finite element method. For any given use of the finite element method we get an approximate solution and we usually wish to have some indication of the accuracy in the approximation. In the case when the calculation is done to estimate a quantity of interest the indication of the accuracy is concerned with estimating the difference between the unknown exact value and the finite element approximation. With a means of estimating the error, this can sometimes be used to determine how to improve the

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34

Grilo, Tiago Jordão. "Development of computational anisotropic hypoelastic- and hyperelastic-based models including nonlinear kinematic hardening." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14428.

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Doutoramento em Engenharia Mecânica<br>In the present work, finite strain elastoplastic constitutive formulations suitable for advanced metallic materials are developed. The main goals are the correct description of the elastoplastic behaviour, including strong plastic anisotropy and cyclic hardening phenomena, in the large strain regime, as well as the development of numerically efficient algorithmic procedures for numerical implementation of the constitutive models into codes of numerical simulation by the Finite Element Method. Two different approaches are used in the derivation of th

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35

Kenja, Krishna. "Bayesian Parameter Estimation for Hyperelastic Constitutive Models of Soft Tissue under Non-homogeneous Deformation." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1515505801223584.

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36

Breslavsky, Ivan, Marco Amabili, and Mathias Legrand. "Circular Cylindrical Shell Made of Neo-Hookean-Fung Hyperelastic Material Under Static and Dynamic Pressure." Thesis, NTU "KhPI", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/24767.

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The present study is devoted to the investigation of static and dynamic behavior of the three-layered composite shell made of hyperelastic material. Such a shell can be considered as a model of human aorta. Since soft biological materials are essentially nonlinear even in the elasticity zone, not only geometrical, but also physical nonlinearity should be taken into account. The physical nonlinearity of soft biological tissues is usually modeled by certain hyperelastic law. The law chosen for this study is the combination of the Neo- Hookean law, which describes the isotropic response at s

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37

Roan, Esra. "Experimental and Multiscale Computational Approaches to the Nonlinear Characterization of Liver Tissue." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179425113.

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38

Becker, Urs [Verfasser], and Bernd [Akademischer Betreuer] Simeon. "Efficient time integration and nonlinear model reduction for incompressible hyperelastic materials / Urs Becker. Betreuer: Bernd Simeon." Kaiserslautern : Technische Universität Kaiserslautern, 2013. http://d-nb.info/1031914935/34.

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39

Sadeghzadeh, Milani Abbas. "Multi-objective inverse method for obtaining constitutive material parameters of textile composites using two hyperelastic models." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18190.

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Numerical simulation of forming processes has been an important means for material selection, tool design, and process optimization. A critical component of simulation, however, is an accurate material constitutive model, describing the response of the material under possible modes of deformation. The accuracy, in turn, is linked to the tests and techniques applied for identification of constitutive models: the more elaborate the identification, the more reliable the material parameters. For textile composites, uncontrollable factors such as contact friction, misalignment, slip, variations in

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40

Estrada, Matthew A. "Design and fabrication of force sensing robotic foot utilizing the volumetric displacement of a hyperelastic polymer." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74436.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 39-40).<br>This thesis illustrates the fabrication and characterization of a footpad based on an original principle of volumetric displacement sensing. It is intended for use in detecting ground reaction forces in a running quadrupedal robot. The footpad is manufactured as a monolithic, composite structure composed of multi-graded polymers reinforced by glass fiber to increase durability and traction. The volumetric dis

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41

Rosendahl, Philipp Laurens [Verfasser], Wilfried [Akademischer Betreuer] Becker, and Holm [Akademischer Betreuer] Altenbach. "From bulk to structural failure: fracture of hyperelastic materials / Philipp Laurens Rosendahl ; Wilfried Becker, Holm Altenbach." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1211726002/34.

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Rosendahl, Philipp [Verfasser], Wilfried [Akademischer Betreuer] Becker, and Holm [Akademischer Betreuer] Altenbach. "From bulk to structural failure: fracture of hyperelastic materials / Philipp Laurens Rosendahl ; Wilfried Becker, Holm Altenbach." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-86934.

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TRIPATHY, SAKYASINGH. "EXTRACTION OF NON-LINEAR MATERIAL PROPERTIES OF BIO-GELS USING ATOMIC FORCE MICROSCOPY." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1123381089.

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Waxman, Rachel. "Effects of geometry and phase on material damage response under high-speed impact." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6078.

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Peridynamics, presented by Silling in 2000 [1], is a reformulation of the elastic theory from differential equations to integral equations, which are more equipped to handle discontinuities, such as crack initiation and propagation. Because of this, peridynamics is an effective tool to address many of the problems relevant to the aerospace and defense industries. For example, airborne sand particles and raindrops cause local damage to aircraft in flight. This damage manifests itself as radial and subsurface lateral cracking, as well as increased surface roughness. All of these damage morpholog

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COSENTINO, Federica. "Biomechanical analysis of Ascending Thoracic Aortic Aneurysm (ATAA)." Doctoral thesis, Università degli Studi di Palermo, 2021. http://hdl.handle.net/10447/479153.

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According to the reports of the World Health Organisation (WHO), cardiovascular diseases are the number one cause of death worldwide. Specifically, arterial disease and degeneration are the major reasons for cardiovascular death and disability. Because these diseases are dependent on the changes of the mechanical properties of the arterial wall, it is very important to know as much as possible about the structural composition of arteries. The human aorta is the biggest artery in the body and consists of three main parts, ascending aorta, aortic arch and descending aorta. The walls of the arter

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Khambati, Suraush Q. "Constitutive Modeling of Rubber and Glass for the Impact Simulation of Safety Glass using the commercial code LS-DYNA." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1302884674.

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Andrews, Mary F. "Evolution Equations for Weakly Nonlinear, Quasi-Planar Waves in Isotropic Dielectrics and Elastomers." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/34649.

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The propagation of waves through nonlinear media is of interest here, namely as it pertains to two specific examples, a nonlinear dielectric and a hyperelastic solid. In both cases, we examine the propagation of two-dimensional, weakly nonlinear, quasi-planar waves. It is found that such systems will have a nonlinearity that is intrinsically cubic, and therefore, a classical Zabolotskaya-Khokhlov equation cannot give an accurate description of the wave evolution. To determine the general evolution equation in such systems, a multi-timing technique developed by Kluwick and Cox (1998) and Cra

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Shadfan, Ramsey Harbi. "On the Energy Conserved in a Buckling Fung Hyperelastic Cylindrical Shell Subjected to Torsion, Internal Pressure and Axial Tension." Thesis, The University of Texas at San Antonio, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10928944.

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<p> A theoretical model is proposed for the buckling of a three-dimensional vein subjected to torsion, internal pressure, and axial tension using energy conservation methods. The vein is assumed to be an anisotropic hyperelastic cylindrical shell which obeys the Fung constitutive model. Finite deformation theory for thick-walled blood vessels is used to characterize the vessel dilation in the pre-buckling state. </p><p> The pre-buckling state is identified by its midpoint and then perturbed by a displacement vector field dependent on the circumferential and axial directions to define the bu

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Zheng, Keke. "The Effect of High Tibial Osteotomy Correction Angle on Cartilage and Meniscus Loading Using Finite Element Analysis." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12178.

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Medial opening wedge high tibial osteotomy (MOWHTO) is a popular clinical method for curing the osteoarthritis (OA) caused by varus deformity. However, the ideal alignment to maximize osteotomy successful rate and post-operative knee function remains controversial to date. Moreover, the between-patient variability of knee joint biomechanics, particularly during functional tasks, signifies critical importance of conducting patient-specific planning. For this reason, this study introduces a subject-specific modeling procedure to determine the biomechanical effects of simulated different alignmen

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Ge, Weirong. "The Improvement of Shear-wave Elastography Imaging in Prediction of Preterm Birth." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29510.

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Complications from preterm birth are one of the leading causes of perinatal mortality and morbidity worldwide. These complications lead to short-term and long-term consequences that are a huge emotional burden to families and a financial burden to the healthcare system. The risk of preterm birth is predicted with the standard methods of assessing obstetric history, measuring cervical length, and other less common practices such as measuring fetal fibronectin concentration. Despite research efforts in this field, the accuracy of diagnosis of preterm birth is not at a satisfactory level. Shear-

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