依据铁磁材料的磁致伸缩逆效应,用特制的磁探测器和信号检测系统,研究材料在周期性载荷作用下产生的磁信号变化规律。发现在一定疲劳程度时,磁感应灵敏度信号呈现突变,且该突变点与材料疲劳应变峰相对应。将此方法标准化,可对使用中的钢铁材料和构件的疲劳寿命进行动态预测。 According to the magnetostrictive inverse effect of ferromagnetic materials, a special magnetic detector and signal detection system are used to study the variation of magnetic signals generated by the material under cyclic loading. It is found that at a certain degree of fatigue, the signal of magnetic induction sensitivity presents a mutation, and the point of the mutation corresponds to the peak of material fatigue strain. This method is standardized to dynamically predict the fatigue life of steel materials and components in service.