Effect of interfacial stiffness on the stretchability of metal/elastomer bilayers under in-plane biaxial tension  

作　　者：Zheng Jia Teng Li 

机构地区：[1]Department of Engineering Mechanics,Center for X-Mechanics,Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province,Zhejiang University,Hangzhou 310027,China [2]Department of Mechanical Engineering,University of Maryland,College Park 20742,MD,USA

出　　处：《Theoretical & Applied Mechanics Letters》2021年第3期157-161,共5页力学快报（英文版）

摘　　要：Flexible electronic devices are often subjected to large and repeated deformation,so that their functional components such as metal interconnects need to sustain strains up to tens of percent,which is far beyond the intrinsic deformability of metal materials(~1%).To meet the stringent requirements of flexible electronics,metal/elastomer bilayers,a stretchable structure that consists of a metal film adhered to a stretchable elastomer substrate,have been developed to improve the stretch capability of metal interconnects.Previous studies have predicted that the metal/elastomer bilayers are much more stretchable than freestanding metal films.However,these investigations usually assume perfect bonding between the metal and elastomer layers.In this work,the effect of the metal/elastomer interface with a finite interfacial stiffness on the stretchability of bilayer structures is analyzed.The results show that the assumption of perfect interface(with infinite interfacial stiffness)may lead to an overestimation of the stretchability of bilayer structures.It is also demonstrated that increased adhesion between the metal and elastomer layers can enhance the stretchability of the metal layer.

关 键 词：Metal/elastomer bilayers Stretchability Interface NECKING 

分 类 号：O344[理学—固体力学] TG113.25[理学—力学]