1. College of Materials Science and Technology, Nanjing Univ. of Aeronautics and Astronautics, Nanjing, 210016, CN (Corresponding author), e-mail: xuesb@nuaa.edu.cn
2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing Univ. of Aeronautics and Astronautics, Nanjing, 210016, CN