Institution: | 1. International Center for Applied Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structure, School of Aerospace, Xi''an Jiaotong University, Xi''an 710049, PR China;2. Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation, Xi''an Jiaotong University, Xi''an 710049, PR China;3. Columbia Nanomechanics Research Center, Department of Earth and Environmental Engineering, Columbia University, New York 10027, USA |