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在反复加载-卸载条件下,测量了35号冷轧钢试件在不同的最大拉应力作用下试件表面某确定点漏磁场随拉应力的对应关系。35号冷轧钢经不同的拉应力作用后,在外磁场作用下,测量了端点表面剩余磁感应强度和矫顽力随拉应力的变化关系。从试验结果得知试件在拉应力作用下的磁化关系,同时证实了可以通过磁信号的大小对试件的安全性做出评估。并可以利用端点表面剩余磁感应强度和矫顽力在屈服点附近发生突变的性质对材料的受力状态和疲劳损伤状况进行探测,能够对负载是否已超出材料屈服强度进行有效判断。
Under repeated loading-unloading conditions, the corresponding relationship between the tensile magnetic field and the tensile stress at a certain point on the specimen surface under different maximum tensile stress was measured. Cold rolled steel 35 under different tensile stress, under the action of an external magnetic field, measured the residual magnetic flux density and coercivity of the end surface changes with the tensile stress. The test results show that the specimen under the tensile stress of the magnetization relationship, at the same time confirmed that the size of the magnetic signal can be used to assess the safety of the specimen. The force status and fatigue damage of the material can be detected by using the residual magnetic flux density and the coercive force near the yield point of the end surface to detect whether the load has exceeded the yield strength of the material.