Microscopic and macroscopic instabilities in finitely strained porous elastomers
Microscopic and macroscopic instabilities in finitely strained porous elastomers
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DOI：
10.1016/j.jmps.2006.11.006
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发表时间：
2007-05-01
影响因子：
5.3
通讯作者：
Triantafyllidis, N.
中科院分区：
文献类型：
--
作者：
Michel, J. C.;Lopez-Pamies, O.;Triantafyllidis, N.
目前的工作是对有限应变多孔弹性体的微观结构不稳定性及其宏观表现之间的联系进行深入研究。本文首次采用强大的二阶均匀化（SOH）技术，研究了周期性多孔弹性体的破坏开始，并将结果与更精确的有限元方法（FEM）计算结果进行了比较。详细研究了不同微几何形状（随机和周期性）、初始孔隙率、基体本构律和宏观载荷方向对周期性微几何形状的微观屈曲和宏观椭圆损失（所有微几何形状）的影响。除了上述基于稳定性的失效机制外，还讨论了对主解的约束，从而完整地描述了有限应变多孔弹性体中存在的不同可能的失效机制。(C) 2006 Elsevier Ltd版权所有。
The present work is an in-depth study of the connections between microstructural instabilities and their macroscopic manifestations-as captured through the effective properties-in finitely strained porous elastomers. The powerful second-order homogenization (SOH) technique initially developed for random media, is used for the first time here to study the onset of failure in periodic porous elastomers and the results are compared to more accurate finite element method (FEM) calculations. The influence of different microgeometries (random and periodic), initial porosity, matrix constitutive law and macroscopic load orientation on the microscopic buckling (for periodic microgeometries) and macroscopic loss of ellipticity (for all microgeometries) is investigated in detail. In addition to the above-described stability-based onset- of- failure mechanisms, constraints on the principal solution are also addressed, thus giving a complete picture of the different possible failure mechanisms present in finitely strained porous elastomers. (C) 2006 Elsevier Ltd. All rights reserved.