摘要
阐述了由工件表面两条平行的槽形裂纹引起的漏磁信号和裂纹之间距离的相互作用关系。通过漏磁信号振幅随两条裂纹的深度比和裂纹间距离的增加而减小的关系计算其中较小裂纹的深度,同时提出了代替信号波形分析的基于漏磁信号切线和法线分量的矢量轨迹分析的新方法。实际检测证明该方法能较好地对裂纹进行估计。
The relation between the magnetic flux leakage signals caused by two adjacent parallel cracks with rectangular shape on a ferromagnetic material surface and the distance between the two cracks is clearly clarified.The depth of smaller crack can be evaluated by considering an effect that the amplitude of leakage flux decreases as the depth ratio of two carcks and the crack-to-crack distance increase.A new nethod based on the analysis of locus of the vector consisting of tangential and normal components of the magnetic flux leakage signals is proposed as an alternative to analyzing the waveform.Some experimental results show that the evaluated crack depth is in good agreement with the actual one.
出处
《自动化与仪表》
2003年第4期1-4,共4页
Automation & Instrumentation
基金
国家自然科学基金资助项目(50175109)
关键词
无损检验
漏磁检测
疲劳裂纹
邻接裂纹
矢量轨迹分析
nondestructive testing
magnetic flux leakage testing
fatigue crack
adjacent cracks
