Buckling of a stiff thin film on a pre-strained bi-layer substrate
Buckling of a stiff thin film on a pre-strained bi-layer substrate
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预应变双层基底上硬薄膜的屈曲
DOI：
10.1016/j.ijsolstr.2014.05.012
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发表时间：
2014-09-01
影响因子：
3.6
通讯作者：
Huang, Yonggang
中科院分区：
文献类型：
--
作者：
Cheng, Huanyu;Zhang, Yihui;Huang, Yonggang
当脆性材料作为薄膜集成在柔软的弹性体基底上时，受控的屈曲可以赋予脆性材料可拉伸的力学性能。然而，典型的弹性体对流体是可渗透的，因此不能提供对水进入例如用支撑薄膜构建的装置的坚固屏障。此外，由软衬底主导的系统的机械强度对于实际应用来说常常是不令人满意的。我们表明，引入一个双层基板产生一个强大的，高强度的系统，保持可拉伸的特性，在基板上的一个相对较硬的层上的软层。作为机械保护，可以在器件的顶部使用软封装层，并且封装系统的拉伸性小于没有封装的系统的拉伸性。通过数值分析和有限元分析，建立了一个简单的，分析模型，为刚性薄膜在双层基板上的可拉伸系统的设计，是有用的。出版社：Elsevier Ltd
Controlled buckling can impart stretchable mechanics to brittle materials when integrated as thin films on soft, elastomeric substrates. Typical elastomers are permeable to fluids, however, and therefor unable to provide robust barriers to entry of water, for instance, into devices built with the supported thin films. In addition, the mechanical strength of a system dominated by a soft substrate is often unsatisfactory for realistic applications. We show that introduction of a bi-layer substrate yields a robust, high strength system that maintains stretchable characteristics, with a soft layer on top of a relatively stiff layer in the substrate. As a mechanical protection, a soft encapsulation layer can be used on top of the device and the stretchability of the encapsulated system is smaller than that of the system without encapsulation. A simple, analytic model, validated by numerical analysis and FEA, is established for stiff thin films on a bi-layer substrate, and is useful to the design of stretchable systems. Published by Elsevier Ltd.