1. Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
2. Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
3. Laboratoire de Tribologie et Dynamique des Systèmes, Ecole Centrale de Lyon, CNRS UMR 5513, Université de Lyon, 69134 Ecully cedex, France
4. Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
5. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
6. Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States