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
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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:
CMES
影响因子:
--
通讯作者:
S.Y.Long, K.Y.Liu, G.Y.Li
S.Y.Long, K.Y.Liu, G.Y.Li
中科院分区:
其他
文献类型:
--
作者:
S.Y.Long, K.Y.Liu, G.Y.Li

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本文提出了一种用于分析弹塑性断裂问题的无网格局部 Petrov-Galerkin 方法(MLPG)。无网格方法使用移动最小二乘法 (MLS) 来近似场函数。形函数不具有试函数插值的克罗内克德尔塔性质,采用直接插值方法施加必要的边界条件。如果忽略体积力,MLPG 方法不涉及任何域积分​​和奇异积分。它只涉及正则边界积分。两个数值算例表明,该方法得到的结果与有限元软件ANSYS得到的结果吻合较好。然而,在本方法中,由于没有域积分,形成切向刚度矩阵的计算时间大大减少,并且由于不需要单元连接和重新网格划分,预处理和后处理时间也大大减少。该方法对于弹塑性断裂问题的求解是有效可行的。关键词:无网格局部Petrov-Galerkin法;移动最小二乘法;亥维赛函数;直接插值法;弹塑性断裂问题
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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