1. Professor, Key Laboratory of Solid Mechanics of MOE, Insitute of Applied Mechanics, Tongji Univ., Shanghai 200092, P. R. China.
2. Associate Professor, Mechanical and Aerospace Engineering, Oklahoma State Univ., Stillwater, OK 74078.
3. Materials Research Engineer, Cold Regions Research and Engineering Laboratory, U.S. Army Engineer Research and Development Center, U.S. Army Corps of Engineers, Hanover, NH 03755-1290.