采用四点弯曲加载，研究300M钢表层应力与巴克豪森信号值的关系，并用磁滞伸缩模型对试验结果进行了分析。结果表明，应力方向与磁化方向平行时，巴克豪森信号值随拉应力的增大而增大，随压应力的增大而减小。但同时也发现随着磁化方向与应力方向的偏离，或是随着磁化强度的变化，这种相关性会发生变化，在特定条件下甚至出现相反变化趋势。

The correlation between 300M steel surface stress and Barkhausen signal has been studied by applying four points bending and analyzed with the magnetostrictive model. It has been shown that, when the direction of stress parallels magnetizing direction, Barkhausen signal increases with the increasing of tensile stress, decreases with the increasing of compressive stress. But at the same time, it has been found that the correlation changes when magnetizing direction deviates from the direction of stress, or magnetizing strength increases, even a contrary trend will advent in a special situation.