The residual magnetic field method for inspection of a reverse-side crack on a thick steel plate

作     者：M. Oka M. Enokizono 

作者机构：1Department of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita 870-0152 Japan 2Faculty of Engineering Oita University 700 Dannoharu Oita 870-1192 Japan 

出 版 物：《AIP Conference Proceedings》 

年 卷 期：2001年第557卷第1期

页      面：1724-1731页

学科分类：07[理学] 0702[理学-物理学] 

摘      要：In order to detect small reverse-side cracks existing on 5 mm thick steel plates, we have measured strength of residual magnetization at 1 mm above 5 mm thick steel plates. A differential type magneto-impedance effect sensor (a gradio-MI sensor) is applied to measure it. Because the gradio-MI sensor is suitable for detection of localized micro magnetic field. From results of our experiments, a distribution of the residual differential magnetic field at 1 mm above a specimen is clearly changed near a reverse-side crack of 1 mm depth with 5 mm length. In this paper, experimental results utilizing the distribution of a residual differential magnetic field measured by gradio-MI sensors is shown. And, validity of the residual magnetic field method for inspection of small reverse-side cracks on thick steel plates is discussed.