1. Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA
2. Center for Mechanics and Materials AML Department of Engineering Mechanics Tsinghua University Beijing 100084 P. R. China
3. Department of Automotive Engineering Tsinghua University Beijin 100084 P. R. China
4. Departments of Civil and Environmental Engineering and Mechanical Engineering Center for Engineering and Health and Skin Disease Research Center Northwestern University Evanston IL 60208 USA
5. School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai 200092 P. R. China
6. National Key Laboratory of Science and Technology on Micro/Nano Fabrication Peking University Beijing 100871 P. R. China
7. Department of Materials Science and Engineering, Chemistry, Mechanical Science and Engineering Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA