Anisotropic elasticity for inversion-safety and element rehabilitation
Anisotropic elasticity for inversion-safety and element rehabilitation
复制标题
用于反转安全和元件修复的各向异性弹性
DOI:
10.1145/3306346.3323014
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Hayley N. Iben
中科院分区:
文献类型:
--
作者:
Theodore Kim;F. D. Goes;Hayley N. Iben
We present an analysis of anisotropic hyperelasticity, specifically transverse isotropy, that obtains closed-form expressions for the eigendecompositions of many common energies. We then use these to build fast and concise Newton implementations. We leverage our analysis in two separate applications. First, we show that existing anisotropic energies are not inversion-safe, and contain spurious stable states under large deformation. We then propose a new anisotropic strain invariant that enables the formulation of a novel, robust, and inversion-safe energy. The new energy fits completely within our analysis, so closed-form expressions are obtained for its eigensystem as well. Secondly, we use our analysis to rehabilitate badly-conditioned finite elements. Using this method, we can robustly simulate large deformations even when a mesh contains degenerate, zero-volume elements. We accomplish this by swapping the badly-behaved isotropic direction with a well-behaved anisotropic term. We validate our approach on a variety of examples.
影响因子:
6.2
作者:
Hu, Yixin;Zhou, Qingnan;Panozzo, Daniele
通讯作者:
Panozzo, Daniele