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首页> 外文期刊>International journal of non-linear mechanics >From period-doubling to folding in stiff film/soft substrate system: The role of substrate nonlinearity
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From period-doubling to folding in stiff film/soft substrate system: The role of substrate nonlinearity

机译：在硬膜/软基材系统中，从倍增到折叠：基材非线性的作用

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摘要

Uniaxial compressed stiff films on soft substrates can evolve into the period-doubling and folding instabilities, beyond the onset of sinusoidal wrinkling. The substrate is modeled as a neo-Hookean solid with a pre-stretch prior to film attachment, and its nonlinearity is obtained. Both the pre-stretch and the external nominal strain imposed on the film/substrate system can induce different substrate nonlinearity, and thus have different effects on the post-buckling mode evolution of the system. This study shows that the critical strain of period-doubling instability is linear to the pre-stretch. As the compressive nominal strain increases, the folding mode occurs beyond the onset of period-doubling in both the pre-tension and the pre-compression case, due to the softening/hardening effects for the inward/outward displacements generated by the positive substrate nonlinearity. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在软性基材上的单轴压缩硬质薄膜可能会演变成倍增周期和折叠不稳定性，而不会出现正弦波起皱。在贴膜之前，将基材建模为具有预拉伸的新霍克固体，并获得其非线性。施加在薄膜/基板系统上的预拉伸和外部标称应变都可能引起不同的基板非线性，从而对系统的后屈曲模式演变产生不同的影响。这项研究表明，倍频不稳定性的临界应变与预拉伸呈线性关系。随着压缩标称应变的增加，由于正基片非线性产生的向内/向外位移的软化/硬化作用，在预拉伸和预压缩情况下，折叠模式都超过了周期倍增的开始。 （C）2015 Elsevier Ltd.保留所有权利。

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