A stable mixed finite element method for nearly incompressible linear elastostatics
A stable mixed finite element method for nearly incompressible linear elastostatics
复制标题
近不可压缩线性弹性静力学的稳定混合有限元方法
DOI:
10.1002/nme.6743
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发表时间:
2021
影响因子:
2.9
通讯作者:
Dawson, Clint
中科院分区:
文献类型:
--
作者:
Valseth, Eirik;Romkes, Albert;Kaul, Austin R.;Dawson, Clint
We present a new, stable, mixed finite element (FE) method for linear elastostatics of nearly incompressible solids. The method is the automatic variationally stable FE method of Calo et al., in which we consider a Petrov–Galerkin weak formulation where the stress and displacement variables are in the spaceH(div) andH1, respectively. This allows us to employ a fully conforming FE discretization for any elastic solid using classical FE subspaces ofH(div) andH1. Hence, the resulting FE approximation yields both continuous stresses and displacements. To ensure stability of the method, we employ the philosophy of the discontinuous Petrov–Galerkin method of Demkowicz and Gopalakrishnan and use optimal test spaces. Thus, the resulting FE discretization is stable even as the Poisson's ratio, and the system of linear algebraic equations is symmetric and positive definite. Our method also comes with a built‐in a posteriori error estimator as well as indicators which are used to drive mesh adaptive refinements. We present several numerical verifications of our method including comparisons to existing FE technologies.
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影响因子:
2.9
作者:
Eirik Valseth;P. Behnoudfar;C. Dawson;A. Romkes
通讯作者:
A. Romkes
影响因子:
2.9
作者:
S. Nagaraj;S. Petrides;L. Demkowicz
通讯作者:
L. Demkowicz
影响因子:
7.2
作者:
Thiago O. Quinelato;A. Loula;M. Correa;T. Arbogast
通讯作者:
T. Arbogast
影响因子:
2.9
作者:
Ambartsumyan, Ilona;Khattatov, Eldar;Nordbotten, Jan M.;Yotov, Ivan
通讯作者:
Yotov, Ivan
影响因子:
1.3
作者:
J. Salazar;Jaime Mora;L. Demkowicz
通讯作者:
J. Salazar;Jaime Mora;L. Demkowicz