Meshless method for modeling large deformation with elastoplasticity

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Show simple item record Ma, Jianfeng 2007-10-05T14:19:49Z 2007-10-05T14:19:49Z 2007-10-05T14:19:49Z
dc.description.abstract Over the past two decades meshless methods have attracted much attention owing to their advantages in adaptivity, higher degree of solution field continuity, and capability to handle moving boundary and changing geometry. In this work, a meshless integral method based on the regularized boundary integral equation has been developed and applied to two-dimensional linear elasticity and elastoplasticity with small or large deformation. The development of the meshless integral method and its application to two-dimensional linear elasticity is described first. The governing integral equation is obtained from the weak form of elasticity over a local sub-domain, and the moving least-squares approximation is employed for meshless function approximation. This formulation incorporates: a subtraction method for singularity removal in the boundary integral equation, a special numerical integration for the calculation of integrals with weak singularity which further improves accuracy, a collocation method for the imposition of essential boundary conditions, and a method for incorporation of natural boundary conditions in the system governing equation. Next, elastoplastic material behavior with small deformation is introduced into the meshless integral method. The constitutive law is rate-independent flow theory based on von Mises yielding criterion with isotropic hardening. The method is then extended to large deformation plasticity based on Green-Naghdi’s theory using updated Lagrangian description. The Green-Lagrange strain is decomposed into the elastic and plastic part, and the elastoplastic constitutive law is employed that relates the Green-Lagrange strain to the second Piola-Kirchhoff stress. Finally, a pre- and post-processor for the meshless method using node- and pixel-based approach is presented. Numerical results from the meshless integral method agree well with available analytical solutions or finite element results, and the comparisons demonstrate that the meshless integral method is accurate and robust. This research lays the foundation for modeling and simulation of metal cutting processes. en
dc.language.iso en_US en
dc.publisher Kansas State University en
dc.subject Meshless method en
dc.subject Large deformation en
dc.subject Elastoplasticity en
dc.subject Subtraction method en
dc.subject Singularity removal en
dc.subject Local boundary integral equation en
dc.title Meshless method for modeling large deformation with elastoplasticity en
dc.type Dissertation en Doctor of Philosophy en
dc.description.level Doctoral en
dc.description.department Department of Mechanical and Nuclear Engineering en
dc.description.advisor Prakash Krishnaswami en
dc.description.advisor Xiao J. Xin en
dc.subject.umi Engineering, Mechanical (0548) en 2007 en December en

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