國(guó)家杰出青年基金獲得者、天津大學(xué)汪越勝教授將作大會(huì).....

2020遠(yuǎn)東論壇大會(huì)報(bào)告

國(guó)家杰出青年基金獲得者，天津大學(xué)汪越勝教授

基于金屬磁記憶方法的磁滯磁彈耦合模型和無(wú)損評(píng)價(jià)

報(bào)告摘要：

應(yīng)力集中將導(dǎo)致材料的機(jī)械性能下降，并可能導(dǎo)致災(zāi)難性破壞，這對(duì)人們的生活和經(jīng)濟(jì)發(fā)展構(gòu)成威脅。金屬磁記憶（MMM）方法已被開(kāi)發(fā)為一種新的被動(dòng)無(wú)損評(píng)估（NDT）技術(shù)。它可用于檢測(cè)鐵磁材料中的應(yīng)力狀態(tài)（例如彈性應(yīng)力，殘余應(yīng)力和應(yīng)力集中）和損傷狀態(tài)（例如剛度降低，孔洞和裂縫）。但是，由于缺乏簡(jiǎn)單有效的磁彈性模型，因此尚未對(duì)MMM的定量解釋進(jìn)行深入研究。在這次演講中，建立了一種基于微觀統(tǒng)計(jì)方法的磁滯磁彈性耦合模型，以解釋MMM的物理機(jī)理。該模型需要很少的材料參數(shù)進(jìn)行計(jì)算，相對(duì)直觀，具有明確的物理意義和廣泛的應(yīng)用范圍。在此模型的基礎(chǔ)上，通過(guò)理論和實(shí)驗(yàn)研究了在均質(zhì)應(yīng)力和應(yīng)力集中下具有孔和裂紋的MFL信號(hào)，并表征了MFL信號(hào)。實(shí)驗(yàn)結(jié)果與理論結(jié)果的比較表明，所提出的模型對(duì)于描述MMM現(xiàn)象是有效的。

汪越勝教授簡(jiǎn)歷：

汪越勝，天津大學(xué)力學(xué)系教授。1988年獲上海復(fù)旦大學(xué)應(yīng)用力學(xué)博士學(xué)位，然后在北京交通大學(xué)工程力學(xué)研究所任教。1993年在哈爾濱工業(yè)大學(xué)固體力學(xué)專(zhuān)業(yè)任教。1993年至1995年，在哈爾濱土木建筑大學(xué)擔(dān)任博士后研究員。2018年加入TJU。目前的研究興趣集中在聲子晶體/超材料/超表面，金屬材料和粘合接頭的損傷的非線(xiàn)性超聲NDT＆E以及基于金屬磁性記憶的鐵磁材料的NDT＆E技術(shù)。 現(xiàn)任《固體力學(xué)學(xué)報(bào)》的副主編，《應(yīng)用數(shù)學(xué)和力學(xué)》和《國(guó)際應(yīng)用力學(xué)》雜志編委。

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.