Stress concentration degree affects spontaneous magnetic signals of ferromagnetic steel under dynamic tension load |
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Authors: | Shi Changliang Dong Shiyun Xu Binshi He Peng |
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Affiliation: | aState Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China;bNational Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Dujiakan 21, Changxindian, Beijing 100072, China |
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Abstract: | Under the excitation of geomagnetic field, stress can induce spontaneous magnetic signals in ferromagnetic materials, which can be potentially applied to estimate the damage degree. In this research, the normal component of magnetic field, Hp(y), was measured during dynamic tension test on the surfaces of ferromagnetic specimens having different stress concentration factors, α constant amplitude sinusoidal tensile load cycles were applied on 18CrNi4A steel plate specimens whose α were respectively 1, 3 and 5. Then correlation of Hp(y) values’ changes with loading cycles reported. The results indicate that stress concentration factor, α extremely affects the magnetic signal, the absolute value of the gradient, |K|, increases with the increase of α. Meanwhile, |K| also goes up when loading cycle increases in the initial state. However, after a few cycles, those Hp(y) curves corresponding to different cycles become similar before cracking. |
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Keywords: | Stress concentration degree Dynamic tension load Geomagnetic field Loading cycle |
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