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 13 of 13 for “"elasto-plasticity"”.
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The Structure of Stress-Strain Relations in Finite Elasto-Plasticity
The stress-strain behavior of time-independent elastic-plastic material is investigated for finite strain taking the stable range of response of thin-walled tubes as the starting point.
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Finite deformation of particulate geomaterials: frictional and anisotropic Critical State elasto-plasticity
… constitutive modelling and large strain plasticity. Although focused on soil plasticity, this research has relevance to other areas, such as metal forming and bio-engineering. Initially the concepts of material and geometric non-linearity are reviewed. A general implicit backward Euler …
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Principios variacionales y soluciones numéricas en elasto-visco-plasticidad
… model is studied and it is shown how the viscoplasticity theory can be used not only to model this behavior but also to model plasticity as well as creep. The mixed-initial boundary value problem in elasto/viscoplasticity is presented for the case of quasi-static iso- thermal process and …
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Adaptation of granular solid hydrodynamics for modeling sand behavior
… on the framework of incrementally-linearized elasto-plasticity. However, most of these models do not typically consider energy conservation and are also phenomenological. This means that they can only be used to predict the behavior/ loading conditions for which they have been developed and …
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Design and analysis of transient nonlinear coupled systems
… with history dependent material response, e.g. plasticity. The traditional finite element analysis is combined with sensitivity analysis and numerical optimization to obtain a systematic design algorithm. Sensitivities for a generalized response function are formulated with respect to design …
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Contributions to the anisotropic elasto-plastic analysis of shells
… shells. This work contributes to the anisotropic elasto-plastic analysis of shells by addressing key issues in developing shell elements for finite element analysis and an elasto-plasticity model considering anisotropy and its evolution. First we develop a shell element that models the …
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Stochastic and deterministic models for dense granular flow
… stress field. Limit-State Mohr-Coulomb Plasticity is used to approximate the stress profile in a slow flowing granular assembly. The SFR then describes quantitatively how to convert the slip-line field and stresses into the necessary parameters to fully define a spot's random trajectory …
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Fractals in elastic-plastic transitions of random heterogeneous materials
… very little work was done on fractals in elasto-plasticity, and so this study is one of the first attempts in that direction. Fractal patterns have been found to form in 2D aggregates of grains of either elastic-perfectly plastic type, or elastic-hardening-plastic type, or …
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Testing and constitutive modelling of saturated interfaces in dynamic soil-structure interaction.
… state concept (DSC). The model is based on elasto-plasticity theory as defined by the hierarchical single surface (HISS) plasticity model. The proposed model is calibrated with laboratory tests and is shown to capture the complex strain-softening, degradation, and pore pressure behavior …
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Analisi teorica, numerica e sperimentale dei processi di grandi deformazioni nei materiali duttili
… only on the damage process and the anisotropic elasto-plasticity that, with no doubts, have a fundamental role to correctly modelling the ductile material behavior utilized in the gas/oil onshore and offshore pipelines. After a short historical review of the most important solutions that were …
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Deformation of icy moons induced by heat flux variations from the ocean
Title: Deformation of icy moons induced by heat flux variations from the ocean Author: Martin Kihoulou Department: Department of Geophysics Laboratoire de Planétologie et Géosciences Supervisor: Prof. RNDr. Ondřej Čadek, CSc., Department of Geophysics Dr. Gaël Choblet, Laboratoire de Planétologie …
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Modélisation de la transition solide-fluide dans les géomatériaux. Application aux glissements de terrain.
… Having implemented and validated the first elasto-plastic law in Ellipsis (FEMLIP based code), we have introduced in this code the solid-fluid transition model. This last is based on the evolution, at the failure state detected by the second order work criterion, of the solid elasto-plastic …
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FEMxDEM double scale approach with second gradient regularization applied to granular materials modeling
The multi-scale FEMxDEM approach is an innovative numerical method for geotechnical problems involving granular materials. The Finite Element Method (FEM) and the Discrete Element Method (DEM) are simultaneously applied to solve, respectively, the structural problem at the macro-scale and the …