拉应力对45冷轧钢磁性特征的影响

测量了45冷轧钢试件在不同拉应力作用下,端点表面剩余磁感应强度和矫顽力随拉伸残余应力的变化关系.试验发现,当拉应力小于试件的拉伸屈服点时,不同拉应力产生的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;当外拉应力接近或大于试件的屈服点时,端点表面剩余磁感应强度和矫顽力将急剧增加发生跃变.从试验上证明了,可以利用磁性特征在屈服点附近发生突变的性质对材料的应力集中和疲劳损伤状况进行探测,能够对负载是否已超出试件屈服点的状况进行有效判断,为磁性方法在无损检测技术中的应用研究提供了新的思路.

Influences of Stress on Magnetic Characteristics of 45 Cold Roll Steel

The relstionships of residual magnetization of end surface and coercive force with different tensile stresses of 45 cold roll steel itens were measured. It indicated that when stresses are smaller than the yield point of materials, residual magnetization of end surface and coercive force of materials produced by the fatigues and residual stresses for different stresses almost remain constant. However, when stresses are greater than yield point of the materials, residual magnetization of end surface and coercive force increase sharply. It shows that the magnetic properties can be used to detect stress concentration and load condition, which provide a new outline for magnetic non-destructlve testing method.