1. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
2. Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
3. School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, China
4. Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China
5. Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China