1. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
2. Department of Aerospace Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
3. School of Astronautics, Beihang University, Beijing 100191, China
4. Materials Research Laboratory, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801, USA