Influence of Stress Concentration Factor on Magnetic Memory Effect of Steel Samples under Dynamic Tension Load
نویسندگان
چکیده
Under the excitation of geomagnetic field, normal component of surface scattering magnetic field intensity Hp(y) changes of steel tensile samples with different stress concentration factors α were studied. Constant amplitude sinusoidal tensile load cycles were applied on 18CrNi4A steel plate samples whose α were respectively 1, 3 and 5. Then the correlation of Hp(y) value changes with loading cycles was reported. The results indicated that stress concentration factor extremely affected the magnetic signals, the absolute values |K| of the gradient of the Hp(y) curves increased with the rise of α. Meanwhile, |K| also went up when loading cycles increased in the initial state. However, after a few cycles, those Hp(y) curves corresponding to different cycles became similar before cracking happened.
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