1. Department of Mechanical Engineering and
Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan
2. Fraunhofer Institute for Mechanics of Materials IWM, Wöhlerstraße 11, 79108 Freiburg, Germany
3. Department of Engineering
Mechanics, School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China