作者机构:[1]Southwest Institute of Structural Mechanics, P. O. Box 919-401, Mianyang 621900, Sichuan Province, P. R. China, [2]Department of Mechanics and Engineering Science, Peking University, Beijing 100871, P. R. China
相关基金:Project supported by the National Natural Science Foundation of China (No.10272002) and the Doctoral Foundation of Ministry of Education of China (No.20020001032)