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 22 for “"Constitutive Theory"”.
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Analysis of metal matrix composite structures using a micromechanical constitutive theory
… structures is examined using a micromechanical constitutive theory. Effective lamina and laminate constitutive relations based on the Aboudi micromechanics theory are presented. The inelastic matrix behavior is modeled by the unified viscoplasticity theory of Bodner and Partom. The laminate …
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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
… As a result their is no 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 …
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Enhanced Constitutive Theories for Classical Thermoviscoelastic Polymeric Fluids
This thesis presents ordered rate nonlinear constitutive theories for thermoviscoelastic fluids based on classical continuum mechanics (CCM). We refer to these fluids as classical thermoviscoelastic polymeric fluids. The conservation and balance laws of CCM constitute the core of the mathematical …
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Computational and experimental modelling of the crushing of prepared sugar cane
… of porous media mechanics and elasto-plastic constitutive theory for the crushing of prepared sugar cane using finite element simulation. This research specifically investigates the experiments carried out on C. R. Murry Advanced Experimental Milling Facility using cane that has also passed …
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Aspects of the mechanics of metallic glasses
… developed a large-deformation, elastic-plastic constitutive theory for metallic glasses that incorporates a cavitation mechanism to describe the onset of "brittle" failure. Using this theory, we have conducted finite element simulations of fracture initiation at notch tips in a representative …
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Mechanics of amorphous polymers and polymer gels
… coupled large-deformation elasto-viscoplasticity theory which models the strain rate and temperature dependent response of amorphous polymeric materials in a temperature range which spans the glass transition temperature of the material. We have formulated such a theory, and also numerically …
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Molecular dynamics simulation of mechanical behavior of nanoporous copper foams
… To determine if macro-scale metallic foam theory scaled appropriately to nanoporous foams, the mechanical behavior of nanoporous copper was simulated. Molecular dynamics (MD) simulations were performed at room temperature using the Mishin potential on tetrakaidecahedron foam structures. In …
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On the mechanics of the hydrogen interaction with single crystal plasticity
… presence of hydrogen is incorporated into the constitutive relations through basic equations to simulate its effects on dislocation activation, multiplication, and annihilation. The crystal plasticity model is then implemented in a computationally realizable solution to the single crystal …
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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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Nonlinear analysis for the response and failure of compression- loaded angle-ply laminates with a hole
… uniaxial compressive loading. The endochronic theory was chosen as the constitutive theory to model the AS4/3502 graphite-epoxy material system. Three-dimensional finite element analysis incorporating the endochronic theory was used to determine the stresses and strains in the laminates. An …
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A thermo-mechanical finite deformation theory of plasticity for amorphous polymers : application to micro-hot-embossing of poly(methyl methacrylate)
… been modeled with mixed success by existing constitutive theories. As a result, there is currently no generally agreed upon theory to model the large-deformation, thermo-mechanically coupled, elasto-visco-plastic response of amorphous polymeric materials spanning their glass transition …
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Potential-Based Fracture Mechanics Using Cohesive Zone and Virtual Internal Bond Modeling
The characterization of nonlinear constitutive relationships along fracture surfaces is a fundamental issue in mixed-mode cohesive fracture simulations. A generalized potential-based constitutive theory of mixed-mode fracture is proposed in conjunction with physical quantities such as fracture …
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A finite strain theory of elastoplasticity and its application to wave propagation
A constitutive theory of finite strain plasticity is developed by using the methods of convex analysis. The theory abstracts and extends the classical assumptions of a convex region of admissible stresses, and the normality law. The overall effects of plastic behaviour are contained in the theory …
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Adapting The Modified Cam Clay Constitutive Model To The Computational Analysis Of Dense Granular Soils
The computational constitutive Modified Cam Clay Model (MCCM) was developed at Cambridge to study the behavior of clays and has been proven to be effective. In this study, this model is extended to the case of dense sands to analyze the accuracy of the stress-strain behavior. This analysis is based …
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An investigation of the electromagnetic coupling problem by means of a rational framework and selected experiments
… of the interaction between coupling models and constitutive theory. It is shown that the electromagnetic force model influences the entropy principle, but is not affected by it for simple material responses. However, the electromagnetic energy model is subject to restrictions by the second law …
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Shell finite elements, with applications in biomechanics
… biological tissues. The rigorous but complex theory due to Simo and Fox (1986) is presented in an accessible manner, with detailed derivations where appropriate. The presentation is confined to small strains and linear elasticity, with the constitutive theory extended to take account of …
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A large-deformation thermo-mechanically coupled elastic-viscoplastic theory for amorphous polymers : modeling of micro-scale forming and the shape memory phenomenon
… very well understood, and is modeled by existing constitutive theories with varying degrees of success. There is no generally agreed upon theory to model the large-deformation, thermo-mechanically coupled response of these materials in a temperature range which spans their glass transition …
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On a class of strain gradient plasticity theories : formulation and numerical implementation
… and numerically implemented: * A one-dimensional theory to understand the basic 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 …
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Listening to Language in Gadamer's Hermeneutics
… order to understand the relationship between a constitutive theory of language and a life of wisdom. As Gadamer's texts reveal, the hermeneutic practice of listening to language is a reflective engagement of language that is theoretically grounded in a constitutive view of language. First, we …
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Extension of the peridynamic theory of solids for the simulation of materials under extreme loadings
… we conduct a thorough investigation into the theory of peridynamics and its numerical implementation as a promising alternative approach for simulating extreme material response. Peridynamics is a relatively new nonlocal formulation of continuum mechanics based on integral equations. It …
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