A quadrilateral nonconforming finite element for linear elasticity problem

A quadrilateral nonconforming finite element for linear elasticity problem
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线弹性问题的四边形非协调有限元

DOI:
10.1007/s10444-006-9017-0
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发表时间:
2007-11
影响因子:
1.7
通讯作者:
Mao, Shipeng
Mao, Shipeng
中科院分区:
数学4区
文献类型:
--
作者:
Chen, Shaochun;Mao, Shipeng

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本文提出了一种带双参数的四参数四边形有限元。然后讨论了纯位移边界线弹性方程的四边形有限元逼近。证明了该方法的最优收敛速度是在破缺能量和-范数意义下的,特别是对于Lamé参数是一致收敛的.此外,该计划的性能不会恶化,因为材料变得几乎不可压缩。最后,进行了数值试验,与理论分析相吻合。
In this paper, a four-parameter quadrilateral nonconforming finite element with DSP (double set parameters) is presented. Then we discuss the quadrilateral nonconforming finite element approximation to the linear elastic equations with pure displacement boundary. The optimal convergence rate of the method is established in the brokenenergy and-norms, and in particular, the convergence is uniform with respect to the Lamé parameter. Also the performance of the scheme does not deteriorate as the material becomes nearly incompressible. Lastly, a numerical test is carried out, which coincides with our theoretical analysis.
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