基底上薄膜结构的非线性屈曲力学进展

Nonlinear Buckling Mechanics of Film-substrate Systems:Recent Progress

基底上薄膜结构中的过大残余压应力常常通过屈曲不稳定性诱发薄膜结构和功能的失效.屈曲不稳定性、演化与斑图形成是近年来非线性力学研究的热点.此类屈曲不稳定性受薄膜-基底的力学性质以及界面相互作用影响,进而呈现出复杂的屈曲模式如褶皱、翘曲和折痕等.论文简要综述褶皱、翘曲和折痕等屈曲模式的形成机制、影响因素和后屈曲形貌相关方面的进展.褶皱部分,重点介绍了褶皱的形成、多级褶皱结构、局域化的褶皱、各向异性褶皱和曲面上的褶皱.翘曲部分,介绍了翘曲结构包括一维翘曲结构、＂电话线＂屈曲泡、网络状屈曲泡等的形成与生长过程,并讨论了曲面几何、界面滑移、开裂等因素的影响.折痕及其它复杂屈曲模式部分,介绍了折痕、叠痕及隆起失稳的形成机制与临界条件.

The High residual compressive stress in thin film-substrate systems usually causes structural and functional failures via buckling instability.Surface instability,evolution and pattern formation in buckled films have become hot topics in the field of nonlinear mechanics.Such buckling instabilities depend on not only the mechanical properties of both the film and the substrate but also the interfacial properties between them,exhibiting multiple modes such as wrinkling,buckle-delamination,crease,etc.This paper briefly reviews the formation conditions of these buckling modes,their influencing factors and post-buckling morphologies.The first part focuses on the formations of one-dimensional wrinkling,wrinkle branching,anisotropic wrinkles,localized wrinkles and wrinkles on curved substrates.The second part introduces the formation and growth of one-dimensional buckle-delamination,telephone-cord buckles,and network-like blisters.The effects of substrate curvature,interface sliding and ridge cracking are also discussed.The final part introduces the formation mechanism and critical conditions of other advanced buckling modes such as crease,folding and ridge.