Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Hyperelasticity"”.
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A virtual element method for hyperelasticity
… studies the approximation of plane problems of hyperelasticity, using a loworder virtual element method (VEM). The VEM is an extension of the finite element method (FEM). It is characterised by considerable freedom with regard to element geometry, permitting arbitrary polygonal and polyhedral …
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Numerical modelling of rubber hyperelasticity, parameter identification and finite element implementations
… investigate and develop methods to model rubber hyperelasticity. Accurate numerical modelling of the hyperelastic behaviour of rubber requires a capable constitutive model and experimental data from the material or component of interest. This research focuses on three areas: hyperelastic …
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Micro-Pipette Aspiration for Hyperelastic and Poroelastic Material
… cells are described with the properties of hyperelasticity and poroelasticity, to study the response of these materials under the loading conditions of aspiration. The work put forth, builds on complexities by considering geometric non-linearities of contact between the continuum and the …
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MODELING AND EXPERIMENTAL INVESTIGATIONS OF THE SHOCK RESPONSE OF VISCOELASTIC FOAMS
… a three-phase composite theory to finite strain hyperelasticity providing the following advantages: 1) identification of the hyperelastic free energy contributions associated with the gas and material phases, 2) elimination of deviatoric experiments for parameter determination, and 3) proper …
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Multiscale modelling of sutures in a high-performing biological protective structure: the turtle shell
… modelling aspects, such as viscoelasticity, hyperelasticity, and anisotropy.
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An Optimal Control Approach to Implant Shape Design : Modeling, Analysis and Numerics
… necessary optimality conditions in polyconvex hyperelasticity with nonlinear pressure-type boundary conditions. Important theoretical results, such as existence of solutions and higher regularity, are currently not available for such problems. Based on the existence result for polyconvex …
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Meshfree Modelling of Hyperelastic Mechanics
… to enforce incompressibility in solid mechanics. Hyperelasticity does not only undergo large deformations, they also exhibit nearly- to-truly incompressible behaviour. Such incompressibility constraints may be enforced using mixed formulations, but this requires the user to define the distribution …
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Dynamic Modeling of Soft Robotic Dielectric Elastomer Actuator
… the multiphysics dynamics within the DEA. Hyperelasticity in most elastomeric materials is characterized by a nonlinear spring capable of undergoing large deformation; thus, defining the isostatic nonlinear relationship between stress and stretch. The transient response is added by …
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Simulación del flujo sanguíneo y su interacción con la pared arterial mediante modelos de elementos finitos
… interaction, coupled models, newtonian fluid, hyperelasticity, finite element method, mesh generation.
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Numerical Constitutive Modelling for Continuum Mechanics Simulation
… temperature dependent, anisotropic non-linear hyperelasticity. A method is presented for finding deformed states of a material on the same isentrope as a given starting configuration. The energies and stresses of a number of elastic deformations are sampled from dft molecular dynamics using …
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NUMERICAL METHODS FOR MULTIPHASE FLOWS: FROM A SIMPLIFIED INCOMPRESSIBLE BAER-NUNZIATO MODEL TO A UNIFIED THEORY OF COMPRESSIBLE MULTIPHASE FLUID AND SOLID MECHANICS
… of constituents. Furthermore, the Eulerian hyperelasticity equations of Godunov and Romenski (GPR) are used to introduce viscous and elastic forces. These Eulerian equations of solid mechanics are characterised by algebraic relaxation source terms that are capable of extending the …
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Modelizado y optimización de problemas biomecánicos mediante la combinación del método de los elementos finitos (mef) y técnicas avanzadas de optimización
… large deformations, large displacements, hyperelasticity, etc. This type of nonlinear behaviour is difficult to model and optimise by widely used methods such as the Finite Element Method (FEM). First, there is a very high computational cost when only FEM is applied to model and optimise …
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Material and Geometric Analysis of Structures Subjected to Large Deformation
The two major focuses of this dissertation are: (1) Studying the structural behaviors of hyper-elastic membranes subjected to extremely large deformation. These membranes are used in a reconfigurable tooling system (RTS) which was under development during the course of this study. (2) Establishing …
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Computational Multi-material Inverse Design of Soft Robotic Actuators via Nonlinear Functional Optimization
The compliant nature of soft robotic actuators allows them to maneuver and interact with the environment in ways which are more adaptable and inherently safer compared to the traditional rigid body robots. However, this compliance makes it difficult to control their deformation as these actuators …
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Exploring Immersed FEM, Material Design, and Biological Tissue Material Modeling
This thesis utilizes the Immersed Interface Finite Element Method (IIFEM) for shape optimization and material design, while also investigating the modeling and parameterization of lung tissue for Diver Underwater Explosion (UNDEX) simulations. In the first part, a shape optimization scheme …
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Employing Fluid Structure Interaction Analyses to Reveal Insights in Atherosclerotic Progression in the Carotid Artery
Atherosclerosis, the leading cause of death globally, has been shown to have a biomechanical link. A broad consensus exists that low levels of hemodynamic Wall Shear Stress (WSS) facilitate atherosclerotic stenoses (arterial blockages). Despite numerous studies on this phenomenon, the effects of …
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Studying the Effects of Thermo-oxidative Aging on the Mechanical, Tribological and Chemical Properties of Styrene-butadiene Rubber
Styrene-Butadiene Rubber (SBR) is a form of rubber compound that is widely used in the tire industry. This is due to some of their unique characteristics such as high strength, high elasticity and resilience, high abrasion resistance, ability to absorb and dissipate shocks and vibrations, low …
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Nonlinear analysis of hyperelastic materials and structures using higher-order finite elements
L'abstract è presente nell'allegato / the abstract is in the attachment