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