压力容器2016，Vol.33Issue(5)：62-68,7.DOI:10.3969/j.issn.1001-4837.2016.05.010
电磁超声横波检测钢板减薄缺陷的有限元分析
Finite Element Analysis of Steel Thinning Defect Detection of Electromagnetic Acoustic Transducer Shear Wave
徐文峰 1赵建平1
作者信息
- 1. 南京工业大学机械与动力工程学院，江苏南京 211816
- 折叠
摘要
Abstract
The shear waves in measured specimen excitated by EMAT(electromagnetic acoustic transduc-er)can be applied to detect thickness and internal defect of specimen.Finite element analysis was applied to simulate the mechanism of electromagnetic ultrasonic excitation of shear wave.Through the es-tablishment of three-dimensional model of EMAT and electromagnetism coupling calculation,the distribu-tion of the surface magnetic field,eddy current and Lorenz force were obtained,the results show the mech-anism of EMAT wave excitation,which provides reference for the design of the electromagnetic ultrasonic transducer.With the coupling of electromagnetics and structural dynamics calculation,the propagation of shear waves in the specimen thickness direction was obtained,results show that the shear wave propagates in the specimen along the thickness direction,and the energy is attenuated trend.In addition,the structure dynamics analysis of the defective plate provides that the wave fluctuations occur obvious change and decay when they encounter the defect.It proves the wave excitation of EMAT can effectively detect the de-fects inside the specimen.According to the results of simulation and experiments,the method of quantitati-ving defect by shear wave detection was put forward.关键词
电磁超声/横波/波动/缺陷检测Key words
electromagnetic acoustic transducer/shear wave/wave/defect detection分类
机械制造引用本文复制引用
徐文峰,赵建平..电磁超声横波检测钢板减薄缺陷的有限元分析[J].压力容器,2016,33(5):62-68,7.
