An Analysis for the Elasto-Plastic Fracture Problem by the Meshless Local Petrov-Galerkin Method
An Analysis for the Elasto-Plastic Fracture Problem by the Meshless Local Petrov-Galerkin Method
复制标题
无网格局部Petrov-Galerkin法分析弹塑性断裂问题
DOI:
10.3970/cmes.2008.028.203
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发表时间:
2008-04
期刊:
影响因子:
--
通讯作者:
S.Y.Long, K.Y.Liu, G.Y.Li
中科院分区:
文献类型:
--
作者:
S.Y.Long, K.Y.Liu, G.Y.Li
A meshless local Petrov-Galerkin method (MLPG) for the analysis of the elastoplastic fracture problem is presented in this paper. The meshless method uses the moving least squares (MLS) to approximate the field functions. The shape function has not Kronecker Delta properties for the trial-function interpolation, and a direct interpolation method is adopted to impose essential boundary conditions. The MLPG method does not involve any domain and singular integrals if body force is ignored. It only involves a regular boundary integral. Two numerical examples show that results obtained by the present method have a good agreement with that by FEM software-ANSYS. However, in the present method, the computational time is greatly reduced in forming the tangent stiffness matrix because there is no domain integral, and the preand post-processing time are also greatly reduced because no element connectivity and no remeshing are required. The proposed method is valid and feasible for the solution of the elasto-plastic fracture problem. Keyword: Meshless local Petrov-Galerkin method; Moving least squares; Heaviside function; direct interpolation method; Elasto-plastic fracture problem
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