Effects of Stress on Magnetic Characteristics for 20 Cold Rolled Steel Component
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摘要: 测量了20号冷轧钢在不同拉应力作用后，试件端点表面磁感应强度随拉应力的变化关系曲线，并对端点表面剩余磁感应强度和矫顽力随拉应力的关系进行了分析。当外作用拉应力小于试件的拉伸屈服点应力时，残余应力对端点表面剩余磁感应强度和矫顽力的影响很小；当外拉应力大于试件的屈服点应力时，端点表面剩余磁感应强度和矫顽力将急剧增加发生跃变。以此可以利用端点表面剩余磁感应强度和矫顽力在屈服点发生突变的性质对材料所受的应力状况进行探测，能够对试件负载是否已超出屈服点作出有效判断，为磁性检测方法的研究提供了新的思路。Abstract: The relationships of magnetization of end surface with different stresses of 20 cold rolled steel items were measured and residual magnetization of end surface and coercive force with different stresses were analyzed. It was indicated that when stresses were smaller than bend point of materials, residual magnetization of end surface and coercive force of materials produced by the fatigues and residual stresses for different stresses almost remained constant. However, when stresses were greater than bend point of the materials, residual magnetization of end surface and coercive force increased sharply. It showed that the properties of mutation for residual magnetization of end surface and coercive force could be used to detect stress concentration and load condition, providing a new research thought for magnetic nondestructive testing method.
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