国家杰出青年基金获得者、天津大学汪越胜教授将作大会.....

2020远东论坛大会报告

国家杰出青年基金获得者，天津大学汪越胜教授

基于金属磁记忆方法的磁滞磁弹耦合模型和无损评价

报告摘要：

应力集中将导致材料的机械性能下降，并可能导致灾难性破坏，这对人们的生活和经济发展构成威胁。金属磁记忆（MMM）方法已被开发为一种新的被动无损评估（NDT）技术。它可用于检测铁磁材料中的应力状态（例如弹性应力，残余应力和应力集中）和损伤状态（例如刚度降低，孔洞和裂缝）。但是，由于缺乏简单有效的磁弹性模型，因此尚未对MMM的定量解释进行深入研究。在这次演讲中，建立了一种基于微观统计方法的磁滞磁弹性耦合模型，以解释MMM的物理机理。该模型需要很少的材料参数进行计算，相对直观，具有明确的物理意义和广泛的应用范围。在此模型的基础上，通过理论和实验研究了在均质应力和应力集中下具有孔和裂纹的MFL信号，并表征了MFL信号。实验结果与理论结果的比较表明，所提出的模型对于描述MMM现象是有效的。

汪越胜教授简历：

汪越胜，天津大学力学系教授。1988年获上海复旦大学应用力学博士学位，然后在北京交通大学工程力学研究所任教。1993年在哈尔滨工业大学固体力学专业任教。1993年至1995年，在哈尔滨土木建筑大学担任博士后研究员。2018年加入TJU。目前的研究兴趣集中在声子晶体/超材料/超表面，金属材料和粘合接头的损伤的非线性超声NDT＆E以及基于金属磁性记忆的铁磁材料的NDT＆E技术。 现任《固体力学学报》的副主编，《应用数学和力学》和《国际应用力学》杂志编委。

A Hysteretic Magnetoelastic Coupling Model and NDE based on Metal Magnetic Memory Method

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

Abstract

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.