1. School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
2. Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
3. U.S. Naval Research Laboratory, Washington, DC 20375, USA
4. Department of Material Science and Engineering & Marine Engineering and Technology, Texas A&M University, College Station, Texas 77843, USA
5. School of Engineering, University of Maryland, College Park, Maryland 20742, USA