摘要
电磁超声换能器(EMAT)因其非接触式的检测特点被广泛应用于无损检测和无损评估中,但如何用其判定裂纹的活性尚未见报道。因电磁声发射技术能够对微细裂纹进行检测并判定其活性,在考虑磁致伸缩效应的基础上,根据EMAT和电磁声发射两种检测方法的原理特性,实现EMAT对铁磁材料的电磁声发射检测。对EMAT进行仿真分析和实验,结合凯瑟效应和声发射理论,给出裂纹活性的判定依据。仿真和实验结果表明,EMAT可在铁磁材料中激发声发射信号,并实现对铁磁材料的损伤评定,为EMAT在实际检测中判定裂纹活性提供了理论和实践指导。
The electromagnetic acoustic transducer(EMAT)is widely used in non-destructive testing and non-destructive evaluation due to its feature of non-contact testing.However,researches and reports on how to use it to judge the crack activity have not been seen.Since the electromagnetic acoustic emission technology can be used to detect microcracks and judge their activity,the detection by EMAT on the electromagnetic acoustic emission of ferromagnetic materials is realized in an innovative manner on the basis of taking the magnetostrictive effect into consideration and according to the principles and properties of the two detection methods of EMAT and electromagnetic acoustic emission technology.This paper offers simulation analyses and experiments on EMAT and provides a judgment basis for the crack activity.The simulation and experimental results show that EMAT can generate acoustic emission signals in the ferromagnetic material and accomplish the destruction assessment on the ferromagnetic material,which provides theoretical and practical instructions in the judgment of crack activity in actual detections by EMAT.
出处
《电工技术学报》
EI
CSCD
北大核心
2017年第18期98-105,共8页
Transactions of China Electrotechnical Society
关键词
电磁超声换能器
电磁声发射
铁磁材料
磁致伸缩
Electromagnetic acoustic transducer
electromagnetic acoustic emission
ferromagnetic material
magnetostriction
作者简介
金亮，男，1982年生，博士，讲师，主要从事电磁场云计算和电磁无损检测方面的研究工作。E-mail: jinliang@tjpu.edu.cn（通信作者）;寇晓斐，男，1992年生，硕士研究生，主要从事电磁无损检测方面的研究。E-mail: 972092373@qq.com
