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pressure-sensitive-material
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Determination of the Plastic Zone at the Tip of a Crack in Pressure-Sensitive Materials Using RKPM
, M.Sc. Thesis Sharif University of Technology ; Mohammadi Shoja, Hossein (Supervisor) ; Jahanshahi, Mohsen (Supervisor)
Abstract
This project presents an outline of the crack tip stress fields in the presence of a plastic enclave around a growing fatigue crack using RKPM and Drucker-Prager criterion for pressure sensitive materials such as concrete and rock. Two distinguished features of RKPM are the arbitrarily high order smoothness and the interpolation property of the shape function which has kronecker delta property at the associated nodes. This method has proved to handle extreme material deformation and moving discontinuities. For the frictional materials such as rock in geotechnical engineering, a non-associated or associated Drucker- Prager plasticity model is appropriate for modeling its constitutive...
An arbitrary lagrangian-eulerian technique for plasticity of pressure-sensitive material with reference to powder forming processes
, Article 9th International Conference on Technology of Plasticity, ICTP 2008, Gyeongju, 7 September 2008 through 11 September 2008 ; 2008 , Pages 1825-1830 ; Anahid, M ; Dormohammadi, H ; Shahim, K ; Sharif University of Technology
Hanrimwon Publishing Co
2008
Abstract
In this paper, an application of arbitrary Lagrangian-Eulerian method is presented in plasticity behavior of pressure-sensitive material, with special reference to large deformation analysis of powder compaction process. In ALE technique, the convective term is used to reflect the relative motion between the mesh and the material. The convection term is neglected in the material phase, which is identical to a time-step in a standard Lagrangian analysis. The stresses and plastic internal variables are converted to account the relative mesh-material motion in the convection phase. The ALE formulation is then performed within the framework of a three-invariant cap plasticity model in order to...
Modeling of pressure-sensitive materials using a cap plasticity theory in extended finite element method
, Article AMPT/ANMEOS Part 2 ; Volume 164-165 , 2005 , Pages 1248-1257 ; 09240136 (ISSN) ; Azami, A. R ; Khoei, A. R ; Dobrzanski L ; Sharif University of Technology
2005
Abstract
In this paper, a new computational technique based on the extended finite element method (X-FEM) is presented in elasto-plastic behavior of pressure-sensitive material. The cap plasticity model is employed within the X-FEM framework in numerical simulation of powder die pressing. The double-surface plasticity model includes a failure surface and an elliptical yield cap, which closes the open space between the failure surface and hydrostatic axis. The yield cap expands in the stress space according to a specified hardening rule. Application of the X-FEM in simulation of two phase plasticity continuums is presented in an incremental manner and the role of sub-elements in the partition of unity...