1. Department of Engineering Mechanics, Institute of High Performance Computing, A*STAR, 138632, Singapore
2. AML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, People’s Republic of China
3. Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, People’s Republic of China
4. School of Engineering, Brown University, Providence, RI 02912, USA