Abstract: In order to reveal the macro- and micro-mechanism of the influence of cyclic stress on magnetic memory effect, the magnetic memory signal variations under different cyclic numbers of notched specimens made of low steel Q235 steel were investigated by using the stress concentration magnetic indicator TSC-2M-8 based on tension-tension fatigue experiments, and the multiscale fuzzy entropy characteristics of the tangential components were extracted simultaneously. The magnetic domain in situ in the fixed area of the specimen was observed by using the magnetic fluid Fe3O4 self-made based on the power grain method, and the corresponding magnetic domain morphology under different fatigue cycles was obtained. The results show that the whole fatigue process can be divided into three stages including the rapid early change, stable middle stage and rapid increase in the last stage by the macro-magnetic signals, and the multiscale fuzzy entropy can be applied to evaluate fatigue damage quantitatively. The surface magnetic domain structures are arranged disorderly when the specimen is not subjected to cyclic stress, and most change with the increasing fatigue cycles after loading. The leakage magnetic field on the surface of the specimen is the external reflection of the change of internal magnetic domain structures caused by cyclic stress, and they are in good agreement.
冷建成, 李政达, 王玉洁, 周临风. 循环应力对磁记忆效应影响的试验研究[J]. 材料导报, 2019, 33(10): 1723-1727.
LENG Jiancheng, LI Zhengda, WANG Yujie, ZHOU Linfeng. Experimental Study on the Effect of Cyclic Stress on Magnetic Memory Effect. Materials Reports, 2019, 33(10): 1723-1727.
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2019, Vol. 33 
