摘要
电磁声发射技术是通过对导电部件进行电磁加载产生洛仑兹力,进而激发声发射效应,并通过此效应来进行无损检测。它可以定位薄金属板中微小的缺陷或裂缝,而且不需要完全加载,集合了电磁无损检测技术和声发射无损检测技术的优点。建立了电磁声发射的有限元模型,分析了试件在不同加载条件下的形变,对比了几个加载因素对电磁声发射的影响,并对试件进行了温升分析。在数值分析的基础上进行了电磁声发射实验,得到了电磁声发射信号,并对缺陷进行定位。
Electromagnetic acoustic emission technology does nondestructive detection with the effect of dynamic electromagnetic loading to generate a stress field stimulating stress waves from the defects. It can locate small flaws or cracks in thin-walled structures nondestructively to allow inspection of specific areas without loading the whole structure, so it combines advantages of electromagnetic non-destructive testing and acoustic emission non-destructive testing. The paper gives the finite element model of electromagnetic acoustic emission, analyzes the specimen deformations in different conditions, compares effects Of several load factors on electromagnetic acoustic emission and analyzes specimen temperature. Based on the numerical calculation, the experimental is carried out. The experimental result is in good agreement with theoretical analysis.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第1期23-27,51,共6页
Transactions of China Electrotechnical Society
基金
河北省自然科学基金资助项目(E2007000067)
关键词
电磁声发射
洛仑兹力
有限元模型
无损检测
Electromagnetic acoustic emission, Lorentz forces, finite element model, non-destructive testing
作者简介
刘素贞 女,1969年生,博士,教授,主要从事工程电磁场与磁技术方面的研究工作。
杨庆新 男,1961年生,教授,博士生导师,主要从事电磁场数值计算、磁技术及应用和磁性材料建模等方面的研究。