ACS Appl Mater Interfaces. 2009 Jan;1(1):42-7. doi: 10.1021/am800078f.
Pattern transformation in periodic microporous elastoplastic solid coatings is caused by a buckling of the struts and a rotation of the nodes under compressive stresses. The results of a nonlinear numerical investigation confirm the critical role of the bifurcation of the periodic solid under compressive stresses. In striking contrast to the earlier observations of elastic instabilities in porous elastomeric solids, the elastic-plastic nature of the cross-linked periodic microstructure studied here provides the ability to lock in the transformed pattern with complete relaxation of the internal stresses. The study unveils a novel deformation mode in porous periodic solids in the form of organized buckling instability of weak strut elements.
周期性微孔弹性固体涂层中的图案变形是由受压状态下的支柱屈曲和节点旋转引起的。非线性数值研究的结果证实了周期性固体在受压状态下分岔的关键作用。与早期在多孔弹性固体中观察到的弹性失稳形成鲜明对比的是，这里研究的交联周期性微观结构的弹塑性特性提供了一种能力，可以用完全释放内部应力的方式锁定变形模式。该研究揭示了多孔周期性固体中一种新的变形模式，即弱支柱元素的有组织屈曲不稳定性。
