A numerical study on bifurcations in multi-void growth in nonlinear elasticity

A numerical study on bifurcations in multi-void growth in nonlinear elasticity
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非线性弹性多孔隙生长分岔的数值研究

DOI:
10.1007/s10704-018-0323-6
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发表时间:
2018-11
影响因子:
2.5
通讯作者:
Zhiping Li
Zhiping Li
中科院分区:
工程技术3区
文献类型:
--
作者:
Weijie Huang;Zhiping Li

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数值研究了二维非线性弹性问题中多孔洞增长的一种新的分叉现象,其中参考位形为轴对称的两个预先存在的小孔洞。数值实验表明,在大径向对称位移边界条件下,除了通常预期的轴对称平衡解外,还存在两个能量上更有利的非y轴对称平衡解,其中一个空洞的增长占压倒性优势。数值结果表明临界分叉边界位移与材料的可压缩性以及某些几何参数之间的关系。数值实验还表明,二次分叉的存在将有效地加速裂缝的萌生。
A numerical study on a new bifurcation phenomenon in multi-void growth is carried out for a 2-D problem in nonlinear elasticity, where the reference configuration isy-axisymmetric with two pre-existing small voids. The numerical experiments show that, under large radially-symmetric displacement boundary conditions, other than they-axisymmetric equilibrium solution one would normally expect, there are two energetically more favorable non-y-axisymmetric equilibrium solutions in which the growth of one void is overwhelmingly dominant. The relationships between the critical bifurcation boundary displacement and the compressibility of the material as well as some geometric parameters are illustrated by numerical results. The numerical experiments also show that the existence of the secondary bifurcation will effectively expedite the onset of fractures.
非线性弹性空化计算中二次等参数有限元的网格划分策略
DOI: 10.1016/j.cam.2017.09.006
发表时间: 2017-01
影响因子: 2.4
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