Research on influence of stress concentration on metal magnetic memory signal for stress evaluation

Based on the magneto-mechanical effect and stress concentration effect, this paper takes the failure of ferromagnetic components caused by stress concentration as the research background, artificially creates stress concentration by prefabricating U-shaped defects, and discusses the H_p(y) signal distribution law of prefabricated U-shaped defect samples and the difference in H_p(y) signal between specimens with different tip SCFs. Results show that the H_p(y) signal has an apparent mutation in the stress concentration area, and when the stress concentration factor was the same, the magnetic field intensity gradient K becomes higher as tensile load increasing. As stress concentration factor increasing, the K value of the stress concentration area also increases gradually. Based on theoretical model of H_p(y) signal, it can be known that the K value can be used to judge the sample stress concentration degree with the results in this study.