A locking-free solver for linear elasticity on quadrilateral and hexahedral meshes based on enrichment of Lagrangian elements

A locking-free solver for linear elasticity on quadrilateral and hexahedral meshes based on enrichment of Lagrangian elements
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基于拉格朗日单元富集的四边形和六面体网格线弹性无锁求解器

DOI:
10.1016/j.camwa.2020.07.014
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发表时间:
2020-09
影响因子:
2.9
通讯作者:
Ran Zhang
Ran Zhang
中科院分区:
数学2区
文献类型:
--
作者:
Graham Harper;Ruishu Wang;Jiangguo Liu;Simon Tavener;Ran Zhang

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本文基于经典双线性或三线性拉格朗日元素的丰富,提出了一种新的四边形和六面体网格线弹性有限元求解器。它解决了应变-div公式中的原始可变位移,并且可以处理位移和牵引边界条件。它是基于一致有限元的无锁定求解器。该求解器在位移方面具有二阶精度,在应力和膨胀(位移发散)方面具有一阶精度,经理论分析验证并通过基准上的数值实验进行说明。还讨论了实现。
This paper presents a new finite element solver for linear elasticity on quadrilateral and hexahedral meshes based on enrichment of the classical bilinear or trilinear Lagrangian elements. It solves the primal variable displacement in the strain–div formulation and can handle both displacement and traction boundary conditions. It is a locking-free solver based on conforming finite elements. The solver has second order accuracy in displacement and first order accuracy in stress and dilation (divergence of displacement), as validated by theoretical analysis and illustrated by numerical experiments on benchmarks.deal.IIimplementation is also discussed.
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