Bifurcation Diagrams for the Formation of Wrinkles or Creases in Soft Bilayers
Bifurcation Diagrams for the Formation of Wrinkles or Creases in Soft Bilayers
复制标题
DOI：
10.1115/1.4030384
复制
发表时间：
2015-06-01
影响因子：
2.6
通讯作者：
Suo, Zhigang
中科院分区：
文献类型：
--
作者：
Jin, Lihua;Auguste, Anesia;Suo, Zhigang
受到压缩，弹性材料可能会发生各种分叉。均质材料形成折痕，而由刚性膜和顺应性基底组成的双层形成褶皱。在这里，我们展示了几种新类型的分叉行为的双层膜和基板的弹性模量相当。取决于两种材料的模量和厚度的比率，褶皱开始的临界应变可以小于或大于褶皱开始的临界应变。当折痕开始的临界应变低于皱纹的临界应变时，折痕可以是亚临界或超临界的。当褶皱开始的临界应变低于折痕的临界应变时，褶皱可以在比均匀材料中的折痕开始的临界应变低得多的应变下进一步引导至折痕。实验，进行与双层聚二甲基硅氧烷（PDMS）结构的压缩载荷，表明不同类型的分叉行为与理论预测一致。
Subject to compression, elastic materials may undergo bifurcation of various kinds. A homogeneous material forms creases, whereas a bilayer consisting of a stiff film and a compliant substrate forms wrinkles. Here, we show several new types of bifurcation behavior for bilayers consisting of films and substrates of comparable elastic moduli. Depending on the ratios of moduli and thicknesses of the two materials, the critical strain for the onset of creases can be either smaller or larger than that for the onset of wrinkles. When the critical strain for the onset of creases is lower than that of wrinkles, creases can be subcritical or supercritical. When the critical strain for the onset of wrinkles is lower than that of creases, wrinkles can further channel to creases at a strain much lower than the critical strain for the onset of creases in a homogeneous material. Experiments, conducted with bilayer polydimethylsiloxane (PDMS) structures subject to compressive loading, show that the different types of bifurcation behavior agree with the theoretical predictions.