独立双层薄膜中局部屈曲或整体屈曲的出现
The emergence of local wrinkling or global buckling in thin freestanding bilayer films
摘要：
在可变形衬底上周期性地形成刚性覆盖层提供了一种用于为各种新颖应用模板化表面形貌的有用方法。许多实验已经研究了在相对软的预应变弹性基底上压缩刚性膜期间的褶皱形成，并且大多数实验都集中在基底厚度相对于膜厚度可以被认为是半无限的制度上。随着基底的相对厚度减小，膜的弯曲刚度占主导地位，导致双层过渡到局部屈曲或全局屈曲不稳定。在这项工作中，光学显微镜被用来研究的关键参数，确定出现的局部屈曲或全球屈曲的独立双层膜组成的薄的刚性聚合物盖层上的预应变的弹性体基板。控制膜和基底的厚度比以及预应变，并用于创建屈曲相图，其描述了随着基底的厚度比减小系统的行为。一个简单的力平衡模型的开发，以了解厚度和应变的依赖性的扭曲和屈曲模式，获得良好的定量协议与实验仅使用独立测量的材料参数。
英文摘要：
Periodic wrinkling of a rigid capping layer on a deformable substrate provides a useful method for templating surface topography for a variety of novel applications. Many experiments have studied wrinkle formation during the compression of a rigid film on a relatively soft pre-strained elastic substrate, and most have focused on the regime where the substrate thickness can be considered semi-infinite relative to that of the film. As the relative thickness of the substrate is decreased, the bending stiffness of the film dominates, causing the bilayer to transition to either local wrinkling or a global buckling instability. In this work optical microscopy was used to study the critical parameters that determine the emergence of local wrinkling or global buckling of freestanding bilayer films consisting of a thin rigid polymer capping layer on a pre-strained elastomeric substrate. The thickness ratio of the film and substrate as well as the pre-strain were controlled and used to create a buckling phase diagram which describes the behaviour of the system as the ratio of the thickness of the substrate is decreased. A simple force balance model was developed to understand the thickness and strain dependences of the wrinkling and buckling modes, with excellent quantitative agreement being obtained with experiments using only independently measured material parameters.
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