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 8 of 8 for “"Internal state variable"”.
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Finite element analysis of self-pierce riveting in magnesium alloys sheets
… through the use of the finite element method. An internal state variable (ISV) plasticity and damage material model was employed with results in good agreement to experimental data. The results of this study show that the ISV material model is ideally suited for modeling the SPR process in …
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Modeling of materials with internal variables using a thermomechanical approach
… this thesis, the thermomechanical approach with internal variables has been thoroughly analyzed. This approach is based on the combination of thermodynamic principles and continuum mechanics. Therefore it reflects the physical essence of constitutive behavior of materials. Based on this approach, …
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Development and preliminary numerical investigations of a dislocation density-based finite-strain rate-dependent elastoplasticity constitutive model
… phenomena of interest. Such models make use of internal state variables that do not directly represent the associated evolution of the material microstructure, such as accumulated plastic strain. As a result, these models cannot directly provide microstructural information that may be of …
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Multiscale Modeling of the Deformation of Semi-Crystalline Polymers
… models are required. In this research, an internal state variable continuum model has been developed whose internal state variables (ISVs) and evolution equations are related to the nano-scale structures. Specifically, the ISVs represent entanglement number density, crystal number density, …
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A lumped-parameter model of tire-terrain interactions for off-road vehicles
… emphasis have been placed on establishing internal mathematical consistency of the formulation and energetic consistency of the model. The thesis presents detailed analysis of two instances of tire-terrain interactions under steady state condition. The thesis further presents the …
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Framework for a Unified Macroscale Model of Magnetostriction
This dissertation presents the development of a framework for a unified mutliscale model of magnetostriction. The lack of accurate models of macroscale hysteretic magnetostriction has inhibited the development of novel devices and savings. This thesis presents a framework for such a model. After …
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Hierarchical multiscale modeling of Ni-base superalloys
… a collaborative research program with the Ohio State University. The fine scale models include the phase field model which addresses dislocation dissociation in the γ matrix and γ' precipitate phases, and the critical stresses from the model are used as inputs to a grain scale crystal plasticity …
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Adaptive finite element simulation of fracture: from plastic deformation to crack propagation
… convergence. Thus, we present a remeshing and internal state variable mapping technique to enable large deformation modeling and alleviate mesh distortion. We perform detailed studies on the Lie-group interpolation and variational recovery scheme and conclude that the approach results in very …