In this research, the correlation between the stress concentration and the residual magnetic field (RMF) of 30Cr steel was investigated. Tensile tests were carried out to measure the RMF signals on the surface of U‐shaped defect specimens. It was found that the tangential RMF signal at the defect area is correlated to the applied load and the stress concentration factor. A new method based on magnetic field to evaluate the stress concentration degree is proposed. This research provides a potential possibility for quantitative inspection of the stress concentration in ferromagnetic steels using the RMF measurements.

中文翻译：

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基于残余磁场测量的U型缺口应力集中评估

在这项研究中，研究了应力集中与30Cr钢的残余磁场（RMF）之间的关系。进行拉伸测试以测量U形缺陷样品表面上的RMF信号。发现缺陷区域的切向RMF信号与所施加的载荷和应力集中因子相关。提出了一种基于磁场的应力集中度评估方法。这项研究为使用RMF测量定量检测铁磁钢中的应力集中提供了潜在的可能性。