电磁声谐振对Q235钢压缩形变评价研究  

Research on electromagnetic acoustic resonance for plastic deformation in Q235 steel

作　　者：蔡智超 陈澜 赵振勇 田贵云[2] Cai Zhichao;Chen Lan;Zhao Zhenyong;Tian Guiyun(School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China;School of Engineering, Newcastle University, Newcastle NE1 7RU, UK)

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013 [2]英国纽卡斯尔大学工程学院,纽卡斯尔NE17RU

出　　处：《仪器仪表学报》2019年第5期153-160,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金青年科学基金(51807065)项目资助

摘　　要：结构件塑性变形检测是设备安全运维中值得注意的重要问题。针对常见的Q235钢材料塑性变形问题,提出了一种基于电磁换能器谐振模式的非接触超声检测的方法。有别于传统的超声回波反射时差法测距原理,共振所产生的谐振超声能够显著增强电磁声谐振点的声波幅值,利用超声波在试件内共振方式实现更高精确的厚度检测。通过双波压缩叠加法及双波压缩叠乘法能够有效改善电磁声谐振信噪比并实现谐振点的提取。通过对标准试件的厚度测量,其厚度测量绝对误差控制在0.2%以下,最后利用电磁声谐振实现对不同轴向压力载荷下Q235试件的形变测量。Inspection of plastic deformation in structural specimen is one key problem for safe operation and maintenance. In this paper, a contactless ultrasonic testing method using an electromagnetic acoustic transducer in resonant mode is proposed to solve the problem of plastic deformation in Q235 steel. Compared with conventional ultrasonic pulse echo method for plastic deformation inspection, the use of resonant ultrasonic signals and signal processing with power spectrum analysis can significantly enhance signal amplitude of the electromagnetic acoustic resonance (EMAR). The double wave superposition of n^th compression and double wave multiplication of n^th compression are applied to increase the signal-to-noise ratio and detecting ability of the resonant wave crests. Hie absolute error of EMAR detection in the standard specimens measurement is smaller than 0. 2%, which demonstrates the capability of this plastic deformation in Q235 steel.

关 键 词：塑性形变 无损检测 电磁声谐振 

分 类 号：TB553[理学—物理] TH89[理学—声学]