Emergent antisymmetric wrinkling patterns in films on ridged substrates  

作　　者：Jiahui Zhang Yi Sun Linghui He Yong Ni 

机构地区：[1]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,CAS Center for Excellence in Complex System Mechanics,University of Science and Technology of China,Hefei,230026,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第11期179-187,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFA1203602);the National Natural Science Foundation of China(Grant Nos.12025206,12072337,and 11872335);the Fundamental Research Funds for the Central Universities(Grant No.WK2090000020)。

摘　　要：We report the formation of antisymmetric wrinkling patterns in films on ridged substrates induced by the buckling instability of the substrates via finite element simulations and experiments.Our simulated results reveal that the uniaxial compression along the ridge can trigger both the wrinkling instability of the film and the lateral buckling instability of the ridge.The latter could change the wrinkles from a symmetric pattern to an antisymmetric pattern in a range of film-substrate modulus ratio and aspect ratio of the ridge profile,as validated by the experimental observations.A three-dimensional phase diagram with four buckling patterns,i.e.,sole ridge buckling pattern,antisymmetric wrinkling pattern with different wavelengths from ridge buckling,symmetric wrinkling pattern without ridge buckling,and antisymmetric wrinkling pattern with the same wavelength as ridge buckling,is built with respect to the uniaxial compression,modulus ratio,and aspect ratio.The results not only elucidate how and when the interplay between the wrinkling instability and the ridge instability results in the formation of the antisymmetric wrinkling pattern but also offer a way to generate controllable complex wrinkling patterns.

关 键 词：wrinkling pattern BUCKLING INSTABILITY ridged film-substrate system antisymmetric wrinkles 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TB383.2[自动化与计算机技术—计算机科学与技术]