A 4-node quasi-conforming quadrilateral element for couple stress theory immune to distorted mesh

A 4-node quasi-conforming quadrilateral element for couple stress theory immune to distorted mesh
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不受扭曲网格影响的耦合应力理论的 4 节点准一致四边形单元

DOI:
10.1016/j.compstruc.2016.06.010
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发表时间:
2016-10
影响因子:
4.7
通讯作者:
Hu, Ping
Hu, Ping
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang, Changsheng;Zhang, Xiangkui;Hu, Ping

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本文提出了一种适用于偶应力理论的四节点四边形拟协调元。该方法从应力的截断泰勒展开式出发,将应力函数矩阵作为权函数处理,弱化了应变位移方程。最后引入弦网函数进行应变积分,并采用应力光滑技术提高单元的应力精度。数值结果表明,该模型能通过C 0-1分片检验,且在单元形状退化为三角形或凹四边形时仍具有良好的精度,能较好地捕捉微结构的尺度效应。
In this paper, a 4-node quadrilateral quasi-conforming element for couple stress theory is proposed. The formulation starts from truncated Taylor expansion of stresses, then the stress-function matrix is treated as weighted function to weaken the strain-displacement equations. Finally the string-net functions are introduced to calculate strain integration and the stress smooth technique is adopted to improve the stress accuracy of the element. Numerical results show that the proposed new model can pass the C 0-1 patch test and possesses excellent precision even when the element shape degenerates into triangle or concave quadrangle, which can capture the scale effects of microstructure.
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