Please use this identifier to cite or link to this item: http://localhost:8081/jspui/handle/123456789/17505
Title: NUMERICAL ANALYSIS OF NONLINEAR SOLID C MECHANICS PROBLEMS USING XFEM
Authors: Subhash, Shedbale Amit
Keywords: Plasticity Modeling;Element Method;Stress Intensity Factor;Gurson-Tvergaard- Ncedlcman
Issue Date: Jun-2013
Publisher: I I T ROORKEE
Abstract: in this report, the plasticity modeling is carried out in conjunction with the extended finite clement method (XFEM). A specimen having a major crack (edge or centre crack) along with other discontinuities such as voids, inclusions and minor cracks is simulated under plane stress condition. The present work reports the various issues regarding the crack propagation in elasto-plastic solids. The nonlinear material behavior is modeled by a class of power-law hardening. The Von-Mises yield criterion with isotropic hardening is assumed in the analysis. The analysis of crack tip stress field and displacement field is carried out assuming mode-I and plane stress condition. The basis of fracture criterion for crack growth based on critical stress intensity factor is studied theoretically. The report explores the effect of crack growth on the stress intensity factor (SIF) and fatigue life in the presence of multiple discontinuities. This report provides an introduction to the elasto-plasticity of structures, a detailed review of past developments in the field of elasto-plastic analysis, detailed description of XFEM, and the formulation of elasto-plastic relations. The XFEM is used to model the discontinuities such as voids, inclusions and minor cracks which are randomly distributed in the entire domain. The values of SIF are calculated from XFEM solution using interaction integral approach. The results obtained through linear and nonlinear analysis are compared with each other. In last part of this report, the porous plasticity model i.e. Gurson-Tvergaard-- Ncedlcman (GTN) model is implemented in order to study the ductile fracture behavior of the material. The results obtained from GTN model are compared with those available in literature
URI: http://localhost:8081/jspui/handle/123456789/17505
metadata.dc.type: Other
Appears in Collections:MASTERS' THESES (MIED)

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