1. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, P. R. C.; State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, P. R. C.
2. Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. C.; School of Engineering, Ningbo University, Ningbo 315000, P. R. C. e-mail: