文献类型：期刊文献

英文题名：In-plane shear response and size effects in freestanding bilayer graphene

作者：Su, Ting[1,2,3];Rong, Chao[1,2,3];Yu, Tianhao[1,2,3];Wan, Shijia[1,2,3];Zhang, Ziqin[1,2,3];Wang, Xiaoyuan[1,2,3];Yan, Yabin[1,2,3];Xuan, Fu-Zhen[1,2,3]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：328

外文期刊名：INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES

收录：;EI(收录号：20263421346939);Scopus(收录号：2-s2.0-105047856070);WOS:【SCI-EXPANDED(收录号:WOS:001855402500001)】；

基金：Y. Yan thanks the support of National Natural Science Foundation of China (Grant No. 52275149 and U2468210) . F.Z. Xuan thanks the support of the Fundamental and Interdisciplinary Disciplines Break-through Plan of the Ministry of Education of China (JYB2025XDXM404) , the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 52321002) , and the Basic Research Program of Science and Technology Commission of Shanghai Municipality (Grant No. 22JC1400600) .

语种：英文

外文关键词：Two-dimensional materials; Nanomechanics; Shear deformation; Bilayer graphene; In situ shear test; Wrinkling instability

摘要：Bilayer graphene (BLG) is being actively explored for quantum, electronic, and flexible devices, where mechanical stresses on individual device elements can strongly affect nanodevice performance and reliability. A full understanding of its mechanical behavior under different loading conditions is therefore essential. However, its intrinsic in-plane shear properties have not yet been experimentally examined. Here, we report the first experimental investigation of the in-plane shear response of suspended BLG and directly determine its shear modulus, shear fracture strength, and ultimate shear strain. By varying specimen width at fixed length and combining experimental observations with molecular dynamics simulations, we reveal pronounced size dependence in both the shear resistance of BLG and the accompanying shear-induced wrinkling. Increasing specimen width enhances both the shear modulus and the shear strength, while promoting the formation of a greater number of more closely spaced wrinkles. Chirality has little effect on the shear modulus, wrinkle onset, or wrinkle number, but the fracture strength remains consistently chirality dependent. These findings deepen understanding of shear-induced wrinkling in BLG and its relation to shear resistance, and provide a practical basis for nanomechanical device design through geometric control of wrinkle scale.