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扩展有限元方法计算多夹杂问题时圆形夹杂与四边形单元的几何关系
引用本文:姚再兴,李世海,刘晓宇.扩展有限元方法计算多夹杂问题时圆形夹杂与四边形单元的几何关系[J].计算力学学报,2009,26(2):180-187.
作者姓名:姚再兴  李世海  刘晓宇
作者单位:1. 中国科学院,力学研究所,北京,100190
2. 中国科学院,力学研究所,北京,100190;辽宁工程技术大学,力学与工程学院,阜新,123000
基金项目:国家重点基础研究发展规划(973计划),国家自然科学基金重点项目,国家自然科学基金,国家自然科学基金面上项目 
摘    要:用扩展有限元法XFEM(Extended Finite Element Method)解决夹杂问题时,夹杂与基质的界面把单元分成若干部分.求单元刚度矩阵时,需要分别在这各个部分求积分.找到便于程序编制的描述各积分区域几何形状的方法是亟待解决的问题.本文把各积分区域的形成过程看成是圆对四边形的多次切割.考虑切剩区域与圆的关系时,把不完整的边仍看作完整的边,把切剩区域看成是四边形或是切去一两条边的四边形.采用排列组合的方法,把它们与圆的所有位置关系列了出来.

关 键 词:扩展有限元  夹杂  切剩区域  四边形单元
收稿时间:2007/1/18 0:00:00

Geometrical relation between circular inclusion and quadrangular element for solving multi-inclusions problem by XFEM
YAO Zai-xing,LI Shi-hai and LIU Xiao-yu.Geometrical relation between circular inclusion and quadrangular element for solving multi-inclusions problem by XFEM[J].Chinese Journal of Computational Mechanics,2009,26(2):180-187.
Authors:YAO Zai-xing  LI Shi-hai and LIU Xiao-yu
Institution:1.Institute of Mechanics;Chinese Academy of Sciences;Beijing 100190;China;2.School of Mechanics and Engineering;Liaoning Technical University;Fuxin 123000;China
Abstract:When solving inclusion problem by the Extended Finite Element Method(XFEM),an element is split into many regions by the interface between inclusions and matrix.In order to calculate element stiffness matrix,integral in these regions is necessary.The urgent problem to be solved is to find a convenient method to describe integral regions for programming.The process of forming integral regions is taken as circles repeatedly splitting a quadrangle.Geometrical relation between remained region and circles is anal...
Keywords:XFEM(Extended Finite Element Method)  inclusion  remained region  quadrangular element
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