Affiliation: | 1. Department of Engineering Mechanics, FML , Tsinghua University , Beijing 100084, P.R. China xshwang@mail.tsinghua.edu.cn;3. Department of Engineering Mechanics, FML , Tsinghua University , Beijing 100084, P.R. China;4. Research Center on Materials Mechanics , ChongQing University , ChongQing 400044, P.R. China;5. Division of Mechanical Engineering , Alfred University , New York, NY 14802, USA;6. Zhuzhou Institute of Technology , Huan, Zhuzhou 412008, P.R. China |