1. Shanghai Institute of Applied Mathematics and Mechanics; Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China e-mail:
2. Pratt School of Engineering, Duke University, Durham, NC 27708
3. Shanghai Institute of Applied Mathematics and Mechanics; Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China;
4. Department of Mechanics, Shanghai University, Shanghai 200444, China