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 26 for “"finite deformation"”.
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Finite deformation of particulate geomaterials: frictional and anisotropic Critical State elasto-plasticity
… A framework for the analysis of anisotropic finite deformation elasto-plasticity is presented and a full incremental finite-element formulation provided. The first constitutive model developed in this thesis is a non-associated frictional perfect plasticity model based on a modified Reuleaux …
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Computational procedures for a new class of finite deformation elastic-plastic constitutive equations
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1988.
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Constitutive modeling of the finite deformation behavior of membranes possessing a triangulated networked microstructure
… density function in terms of an arbitrary planar deformation field is proposed using the RVE. Differentiation of the strain energy density function provides expressions for the general multiaxial stress-stretch behavior of the material.
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BODY TENSOR FORMALISM IN FINITE DEFORMATION ELASTICITY AND APPLICATION TO THE TORSION OF A CIRCULAR CYLINDER
… formalism is general and not limited to small deformations. One examines the physical laws and the constitutive equation which relates the stress to the strain with the help of the two Lame coefficients and the three third order elastic constants. Although the body tensor formalism has been …
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A New Node-to-Node Approach to Contact/impact Problems for Two Dimensional Elastic Solids Subject to Finite Deformation
Problems of interest in this study are contact/impact problems wherein the implicit mid-point rule is used as the primary time stepping algorithm to find the solution incrementally. In order to conserve the system energy, the persistency condition is incorporated as the contact constraint. The …
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A thermo-mechanical finite deformation theory of plasticity for amorphous polymers : application to micro-hot-embossing of poly(methyl methacrylate)
… generally agreed upon theory to model the large-deformation, thermo-mechanically coupled, elasto-visco-plastic response of amorphous polymeric materials spanning their glass transition temperatures. What is needed is a unified constitutive framework that is capable of capturing the transition …
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Constitutive Behavior of Bulk Metallic Glass Composites at Ambient and High Temperatures
… based on the second law of thermodynamics, finite-deformation theory and experimental data. A La-based in-situ BMG composite is the material investigated, and its response to compression at different strain rates examined. Experimental results are used to determine the material parameters in …
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A continuum constitutive model for amorphous metallic materials
A finite-deformation, Coulomb-Mohr type constitutive theory for the elastic-viscoplastic response of pressure-sensitive and plastically-dilatant isotropic materials has been developed. The constitutive model has been implemented in a finite element program, and the numerical capability is used to …
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Electroactive polymer actuators: theory and computations
… We present continuum-mechanical theories and finite element computations for three common types of electroactive polymer actuators: (1) ionic polymer-metal composites (IPMCs), (2) piezoelectric polymers, and (3) dielectric elastomers. Highly-coupled physical phenomena drive the actuation …
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A constitutive theory for the mechanical response of amorphous metals at high temperatures spanning the glass transition temperature : application to microscale thermoplastic forming of Zr₄₁.₂Ti₁₃.₈Cu₁₂.₅Ni₁₀Be₂₂.₅
… generally agreed upon theory to model the large-deformation, elastic-visco-plastic response of amorphous metals in the temperature range relevant to thermoplastic-forming. What is needed is a unified constitutive framework that is capable of capturing the transition from a elastic-visco-plastic …
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Finite element analysis of shear band failure with particular reference to circular plate impact
… a two dimensional axisymmetric and plane strain finite element computer program related to the Lagrangian reference frame. A four node element with one point quadrature and associated stabilisation is utilised, and is shown to be superior to standard isoparametric implementations when applied …
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On a class of strain gradient plasticity theories : formulation and numerical implementation
… nature of strain gradient theories; * A small deformation crystal plasticity theory; * A small deformation theory for isotropic viscoplastic materials; and, * A large deformation theory for isotropic viscoplastic materials. The theories are based on: (i) microstresses consistent with microforce …
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Forces on a wall-bound leukocyte due to flowing red blood cells
… motion matches fluid velocity. They allow for a finite deformation with strong resistance to surface dilatation and relatively small but finite resistance to bending. The no-slip condition is applied both on the leukocyte and the vessel walls. The tube diameters for all cases are less than 20 …
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Shock Physics in Compressible Solids
… representation theorem. The models incorporate finite deformation and finite strain physics, making them essential for studying compressible materials. For TE and TVE solids, dissipation is modeled through strain-rate-dependent mechanisms, while TVE solids with rheology account for the …
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Coronary flow mechanics: an anatomically based mathematical model of coronary blood flow coupled to cardiac contraction
… and an avoidance algorithm a three dimensional finite element model has been constructed of the largest six generations of the coronary arterial network within an anatomically accurate finite element model of the left and right ventricles. Segment radii, lengths and connectivity are consistent …
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Mechanics of swellable elastomeric seals
… that leakage is a result of large, nonuniform deformation that stretches the seal material tangential to the sealing surfaces and leads to a corresponding loss of traction normal to the sealing surfaces due to Poisson contraction. This phenomenon was investigated in two analogous seal systems - …
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Continuum Mechanics Modelling of Corrugated Board
… to failure. Firstly, the focus is the problem of finite deformation hygro-elasticity. The assumption of kinematics is based on an additive split of the stretch in an elastic part and a non-elastic part. In time stepping sequences the elastic stretch is updated by the use of the total stretch from …
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Elastic properties of architectured cellular materials and biological materials (equine hoof wall)
… compared to other TPMS-based structures. Finite element simulations involving the Arruda-Boyce finite-deformation elasto-viscoplastic model show good agreement with experimental data. In the second study, the TPMS-based cellular microlattices with Neovius architecture are investigated at a …
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Generation and maintenance of recirculations by Gulf Stream instabilities
… model, recirculations develop only for infinite deformation raduis. Basic flows with finite deformation radius are only weakly supercritical and therefore produced negligible recirculations after equilibration. The problem of maintenance of the recirculations is coupled to the questions of …
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Generation and maintenance of recirculations by Gulf Stream instabilities
… model, recirculations develop only for infinite deformation raduis. Basic flows with finite deformation radius are only weakly supercritical and therefore produced negligible recirculations after equilibration. The problem of maintenance of the recirculations is coupled to the questions of …
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