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.
Results
Showing 1 to 8 of 8 for “"internal state variables"”.
-
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 …
-
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, …
-
A GENERAL MODEL FOR MULTIPHASE MIXTURES AND APPLICATIONS
… of the phases in the mixture are treated as internal state variables and required to obey rate type constitutive equations. Certain types of ideal behavior of the mixture are investigated in the limit of a small ratio of the specific area to the volume fraction for a particular phase in the …
-
Nonlinear structural design using multiscale topology optimization
… we account for the history dependence of internal state variables. Using these sensitivities and topology optimization, we distribute two elastoplastic materials within a design domain to effectively dissipate the energy in an impact problem.
-
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 …
-
In situ diffraction investigations of mechanisms that lead to path dependent mechanical behaviours of nickel-titanium shape memory alloys
… to provide some insights quantify evolution of internal state variables (ISVs) like volume fraction under biaxial loading conditions.The first part of the thesis examines the role of loading history on reorientation mechanics of martensitic NiTi. Deformation under mechanical loads of two sets of …
-
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 …
-
Haemolymph sugar homeostasis and the control of the proventriculus in the honeybee (Apis mellifera carnica L.)
… updated indication of an insect’s nutritional state, it is assumed that the factor controlling the proventri-culus activity is to be found in the haemolymph. The purpose of this doctoral thesis was to investigate how output (metabolic rate), input (food quality and food quantity) and internal …