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 59 for “"Constitutive Modeling"”.
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Constitutive modeling of active polymers
This thesis develops a three-dimensional constitutive model of active polymeric materials, including changes in material volume and properties due to actuation. Active polymers reversibly change shape, volume and/or material properties in response to some external stimulus. Electric fields are a …
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Constitutive modeling of glassy memory polymers
The aim of this research is to develop constitutive models for non-linear materials. Here, issues related for developing constitutive model for glassy shape memory polymers are addressed in detail. Shape memory polymers are novel material that can be easily formed into complex shapes, retaining …
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Constitutive Modeling of Friction in Bolted Connections
… is unknown and poses a significant challenge to modeling the nonlinear vibration of assemblies. This thesis applies empirical and physics-based modeling approaches to identify improvements to current models and a potential path towards predictive models of friction in bolted joints. The empirical …
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Polycrystal plasticity : constitutive modeling and deformation processing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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The constitutive modeling of shape memory alloys
… presents a one-dimensional thermomechanical constitutive model for shape memory alloys based on basic concepts of thermodynamics and phase transformation kinetics. Compared with other developed constitutive relations, this thermomechanical constitutive relation not only reflects the physical …
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Experimental investigation and constitutive modeling of marine clay
A new cross-anisotropic elasto-plastic constitutive model is developed based on experimental observations of marine clay from the Gulf of Mexico. Standard triaxial and torsional simple shear tests performed on the aforementioned clay demonstrate that the soil exhibits a cross-anisotropic behavior …
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Neural Network-Based Constitutive Modeling of Granular Material
An autoprogressive training simulator is developed, and non-linear finite element analysis is implemented to handle geometrically non-linear problems. This simulator is then used for the autoprogressive training of the NN material models using the results of drained triaxial compression tests with …
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Constitutive Modeling of the Resilient Response of Granular Solids
Finally, a few boundary value problems are analyzed with the finite element method to demonstrate the response predicted by the models described above.
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Mechanism-based constitutive modeling of L1₂ single-crystal plasticity
… based on microscopic phenomena. Mechanism-based constitutive modeling and simulation provide an effective method in this respect, assisting in the understanding and development of current existing models, and potentially providing a convenient path for engineering applications. In light of recent …
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Constitutive modeling of Cu-Al-Ni shape memory alloys
… co-existing variants is a twin boundary.) The constitutive modeling of such materials is made difficult by the inherent anisotropic nature of such materials and by the non monotonicity of the stress-strain curves. We develop a systematic method by which we can calculate the free-energy of such …
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Discrete element simulations and constitutive modeling of dense granular flows
… method)</p> <p>simulations and macroscale modeling methods. The rheology of dense sheared granular flow in a Couette device is simulated using DEM. It is found that DEM simulations are capable of capturing the regime transition from quasi-static to intermediate behavior. A constitutive …
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Viscoelasticity of Articular Cartilage and Ligament: Constitutive Modeling and Experiments
… behavior. An anisotropic visco-hyperelastic constitutive model for these tissues has been proposed in this study based on the short-term and long-term internal variables. The constitutive model was particularized for both tissues, numerically implemented into the finite element software …
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Time-dependent deformations of vaginal tissue: Experiments and constitutive modeling
… we proposed a new anisotropic finite-strain constitutive model for the creep of vaginal tissue within the single integral Pipkin-Rogers viscoelastic framework. We assumed the vagina's axes of material symmetry coincide with its main natural anatomical directions, the LD and CD. We validated …
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Ductile fracture after complex loading histories : experimental investigation and constitutive modeling
… thesis research addresses the experimental and modeling issues related to the crack initiation in advanced high strength steels after loading direction reversal. The main outcome of the present work is a fracture initiation model for proportional and non-proportional loading. The starting point …
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Experimental investigation and constitutive modeling of metallic honeycombs in sandwich structures
… a finite-strain rate-independent orthotropic constitutive model for metallic honeycombs has been formulated and implemented into commercial finite element software. The good agreement of the model predictions with the experimental results encourages the use of this constitutive model for …
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Anisotropic ductile fracture of metal sheets : experimental investigation and constitutive modeling
… covering experimental characterization, constitutive modeling and numerical implementation. On the basis of an extensive multiaxial experimental program, the anisotropic plasticity of the present aluminum alloy is modeled using a macroscopic phenomenological model and a polycrystalline …
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Constitutive modeling of the thermo-mechanics associated with crystallizable shape memory polymers
… research addresses issues central to material modeling and process simulations. Here, issues related for developing constitutive model for crystallizable shape memory polymers are addressed in details. Shape memory polymers are novel material that can be easily formed into complex shapes, …
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Experimental testing and constitutive modeling of concrete confined with shape memory alloys
Concrete confinement has been proven to be effective in increasing concrete strength and ductility, which are essential characteristics for structures prone to extreme loading events, such as earthquakes. Andrawes and Shin (2008) first proposed the idea of using shape memory alloy (SMA) spirals to …
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Constitutive modeling of advanced thermoset composites with application to sheet forming processes
… main objective of this research is to develop constitutive material models that can be utilized for modeling thermoset composite response during sheet forming processes. A continuum model has been developed that accounts for temperature and rate dependencies and allows solid finite element …
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