1. Professor, Dept. of Mechanics, Huazhong Univ. of Science and Technology, Wuhan 430074, China.
2. Ph.D. Student, Dept. of Mechanics, Huazhong Univ. of Science and Technology, Wuhan 430074, China.
3. Associate Professor, Dept. of Mechanics, Huazhong Univ. of Science and Technology, Wuhan 430074, China (corresponding author).