Research on magnetic testing method of stress distribution

来源期刊：中国有色金属学报(英文版)2002年第3期

论文作者：李路明 黄松岭 汪来富 杨海青 施克仁

文章页码：388 - 391

Key words：magnetic testing; stress distribution; welding seam

Abstract: For implementing nondestructive evaluation of stress distribution inside ferromagnetic material, a magnetic testing method was developed which does not need artificial magnetizing field. This method was implemented by testing the normal component of the magnetic flux leakage above the object being tested with a constant lift-off from 1 to 10mm. The distribution of the stress inside the specimen can be gotten from that of the normalcomponent of the magnetic flux leakage. A stress concentration specimen, which is a 10mm thickness mild steel plate with a welding seam on it, was tested using this method. The stress distribution of the magnetic testing was identical with that of small hole stress testing method. It indicates that the stress distribution of ferromagnetic material can be known by the magnetic testing method.