1. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, People’s Republic of China
2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing, People’s Republic of China
3. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA
4. Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, People’s Republic of China