Locking-Free Cg-Type Finite Element Solvers For Linear Elasticity On Simplicial Meshes
INTERNATIONAL JOURNAL OF NUMERICAL ANALYSIS AND MODELING(2021)
摘要
This paper presents numerical methods for solving linear elasticity on simplicial meshes based on enrichment of Lagrangian bilinear/trilinear finite elements. This is a renovated use of the classical 1st order Bernardi-Raugel spaces, which were originally designed for Stokes flow. A projection to the elementwise constant space is employed to handle the dilation (divergence of displacement) in the strain-div formulation. Mixed (both Dirichlet and Neumann) boundary conditions are considered for error estimates in the energy-norm and the L-2-norms of displacement and stress. Rigorous analysis and numerical experiments demonstrate that these methods are free of Poisson-locking. Renovation of other Stokes element pairs to linear elasticity is also examined.
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关键词
Bernardi-Raugel spaces, enriched Lagrangian elements, linear elasticity, locking-free, simplicial meshes
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