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下載積分: 經驗 1 , 金幣 -5

Yue-Sheng Wang1,2, Kai Yao2, Li-Bo Wu2

1 Department of Mechanics, Beijing Jiaotong University, Beijing 100044, China

2 Department of Mechanics, Tianjin University, Tianjin 300350, China

Stress concentration will cause the decrease of materials’ mechanical properties and may result in catastrophefailure, which is a threat for people’s life and the economic development. The Metal Magnetic Memory (MMM) method has been developed as a new passive nondestructive evaluation (NDT) technique. It can be applied to detect thestress states (e.g. elastic stress, residual stress and stress concentration) and the damage states (e.g. stiffness degradation, holes and cracks) inferromagnetic materials. However, the quantitative interpretation for MMM hasnot been studied thoroughly due to the lack of a simple and effective magnetoelastic model. In this talk, a new hysteretic magnetoelastic coupling model based on the micro-statistical method is developed to interpret the physical mechanism of MMM. This model, which requires few material parameters for calculation, is relatively intuitive with a clear physical meaning and awide range of application. Based on the proposed model, the MFL signals under homogeneous stress and stress concentration with hole and cracks are studied experimentally and theoretically, and the characterizations of MFL signals areobtained. The comparison between the experimental and theoretical resultsindicates that the proposed model is effective to describe the MMM phenomenon.

Yue-Sheng Wang is a Professor at Department of Mechanics in Tianjin University (TJU). He received his B.S. in Applied Mechanics from Fudan University, Shanghai, in 1988, and Ph.D. in Solid Mechanics from Harbin Institute of Technology in 1993. Then he worked with Harbin University of Civil Engineering and Architecture as a Postdoctoral Research Fellow from 1993 to 1995. He held faculty position at Institute of Engineering Mechanics, Beijing Jiaotong University (BJTU) before he joined TJU in 2018. His current research interests focus on phononiccrystals / metamaterials / metasurfaces, nonlinear ultrasonic NDT&E of damage for metal materials and adhesive joints, and NDT&E technique basedon metal magnetic memory for ferromagnetic materials. He is now the associate editor-in-chief of Acta Mechanica Solida Sinica, and the editorial board member of Applied Mathematics and Mechanics and International Journal of Applied Mechanics.