1. Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.
2. Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210, USA.
3. Department of Mechanical Engineering, University of California, Berkeley, Berkeley, CA 94720, USA.
4. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
5. Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA.
6. Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, USA.