1. Research Group of Mechanics, Yanzhou University, Yangzhou 225009, China; Department of Civil Engineering, University of Akron, Akron, OH 44325
2. Department of Civil Engineering, University of Akron, Akron, OH 44325
3. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545
4. Theoretical Division, Fluid Dynamics and Solid Mechanics Division, Los Alamos National Laboratory, Los Alamos, NM 87545