1. Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
2. Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
3. Global Engineering & Materials, Inc., Princeton, NJ 08540, USA
4. Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
5. School of Engineering, Brown University, Providence, RI 02912, USA