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 20 of 23 for “"Neo-Hookean"”.
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Buckling of thin-walled cylinders from three dimensional nonlinear elasticity
… Gou (2015), describing a nearly incompressible neo-Hookean material, are used in a rigorous way. While the employed kinematics coincides with that used by Flügge, the incremental equilibrium and constitutive equations derived in this work are different from those given by Flügge, but are shown …
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Multilayered Structures under large Bending: Finite Solution and Bifurcation Analysis
… different way from the corresponding homogeneous plate. For a thick plate of neo-Hookean material for instance, the presence of a stiff coating strongly affects the bifurcation critical angle. Experiments designed and performed to substantiate our theoretical findings demonstrate that the …
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Dynamic Response of Linear/Nonlinear Laminated Structures Containing Piezoelectric Laminas
… similar. The transient finite deformations of a neo-Hookean beam or plate with PZT patches bonded to its upper and lower surfaces are simulated by the finite element method. The constitutive relation for the piezoelectric material is taken to be linear in the Green-Lagrange strain tensor but …
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Stabilized space-time fluid-structure interaction techniques with the continuum element
… hyperelastic (Mooney-Rivlin), and Neo-Hookean. Futhermore, each structure model is tested with two different pressure profiles and two different aneurysm thicknesses. Finally, we suggest a procedural change for further investigation: instead of assuming image-based geometry …
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Soluciones discontinuas en materiales reforzados con fibra en grandes deformaciones
… reforzado unidireccionalmente: el material Neo — Hookean reforzado unidirec cionalmente. El estudio de dichas soluciones discontinuas esta relacionado con la perdida de elipticidad de las ecuaciones diferenciales que gobiernan el problema. Dicha perdida de elipticidad es una condición …
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A finite strain theory of elastoplasticity and its application to wave propagation
… are found and compared for solids obeying a neo-Hookean elastic law, and with either the von Mises or Tresca yield criteria.
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Micro-and macromechanics of single crystal and polygrannular lamellar block copolymers
… of oriented (single-crystal) lamellar BCPs with Neo-Hookean phase behavior, and an analytical continuum model was derived for their large-strain hyperelastic response.
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Design of functionally graded compliant mechanisms using topology optimization
… performance compared to traditional homogeneous compliant mechanism designs. Structural performance is assessed with respect to mechanical/geometric advantage and stress distributions. A novel modified solid isotropic material with penalization (SIMP) method is adopted for representing …
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Towards Real-Time Simulation Of Hyperelastic Materials
… such as corotated linear elasticity and Neo-Hookean elasticity are not supported. Simulation of these types of materials currently relies on Newton's method, which is slow, even with only one iteration per timestep. In this work, we start from simple material models such as mass-spring …
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A Multiscale Model for Breast-Conservative Therapy: Computational Framework and Clinical Validation
… This model consists of two parts: a hyperelastic Neo-Hookean Finite-Element Model of the breast tissues and skin, and a Cellular Automata model that mimics the biology of healing after surgery. The resulting multiscale model shows results that agree with our theoretical assumptions and gives as …
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Material modeling and sensor characterization for optimizing footpad force sensing array
… the properties of the Vytaflex@ material and a Neo-Hookean model based on coefficients for a silicone rubber was used to model the footpad. In order to provide accurate simulations, the thesis seeks to determine the best hyperelastic constitutive model to describe the material. Uniaxial tensile, …
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Micromecánica de elastómeros porosos y reforzados con fibras
… macroscópico de materiales heterogéneos partiendo de la simulación numérica de las propiedades efectivas de un volumen representativo de la microestructura. Este volumen ha de ser suficientemente grande como para que las propiedades medias sean independientes de su tama˜no y posición …
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Nonlinear deformations of a thick-walled hyperelastic tube under external pressure
… is formulated for an incompressible isotropic neo-Hookean material. The formulation is fully nonlinear and can accommodate large strains and large displacements. The governing system of nonlinear partial differential equations is derived and then solved numerically using the C++ based …
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Surface and interfacial waves and deformations in pre-stressed elastic materials
… material subject to a general pure homogeneous pre-stress; the secular equation for propagation along a principal axis of the pre-stess is obtained for a general strain-energy function, and conditions which ensure stability of the underlying pre-stress are derived; the influence of the …
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A virtual element method for hyperelasticity
… focused on problems involving the isotropic neo-Hookean material model. Furthermore, there has been limited investigation into the behaviour of the VEM in the nearly incompressible and nearly inextensible limits. In this thesis a VEM formulation with a novel approach to the construction of …
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Instabilities in membrane structures under extreme conditions
… the parallelogram. Furthermore, by assuming a neo-Hookean hyperelastic response, the self-restabilization of the planar state is disclosed at increasing deformation, in analogy to previous observations under the classical setting (namely, a rectangular membrane with lateral contraction …
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Subject-Specific Finite Element Predictions of Knee Cartilage Pressure and Investigation of Cartilage Material Models
… magnetic resonance images (MRIs). Linear (LIN), Neo-Hookean (NH), and poroelastic (PE) cartilage material models were implemented in each FE model for each subject under three loading cases to compare cartilage contact pressure predictions at each load case. An additional objective was to compare …
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Mechanics of swellable elastomeric seals
… agrees well with nonlinear (finite deformation neo-Hookean) finite element simulations, indicating nonlinear effects are unimportant in the bulk of the seal, and only important at the high-pressure and low-pressure ends. Using finite element simulations, we characterize the energy release rates …
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Localized deformation in soft solids around spherical cavities
… to govern both crease onset and crease density. Neo-Hookean solids are found to prefer initiating creasing with many short creases that join to form a collapsed state with only a few creases, whereas creasing in Gent solids initiates with a few creases that propagate across the cavity surface.
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Wrinkling Patterns on Curved Surface with Gradient Curvature under Compression
… mean curvature vary with surface location simultaneously, the zero Gaussian curvature of cones can enable us to ex-plore the mechanisms of governing the pattern formations and evolutions on curved structures in a more controlled way. Besides, the wrinkles on cone-like structures share similar …
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