不同应力集中系数下磁记忆信号影响因素研究

Study on Influence Factors of Magnetic Memory Signals Under Different Stress Concentration Factors

以45CrNiMoVA钢为实验材料,加工不同应力集中系数的试件进行拉拉疲劳实验,采用磁记忆检测仪检测不同载荷及疲劳周次时试件不同位置的磁记忆信号。结果表明:载荷及疲劳周次的增加,均会使磁曲线顺时针转动,且载荷的影响明显强于疲劳周次;不同位置磁记忆信号特征不同。出现疲劳裂纹后,在一定范围内异变峰峰值显著增大。

The tension-tension fatigue tests were carried out with specimens under different stress concentration factors made of 45CrNiMoVA steel.The magnetic memory signals of different scan lines under different loads and fatigue cycles were measured by magnetic memory instruments.The results showed that the signal curves rotated clockwise as the increase of load and cycle,and load played a much more important role in the rotation.The magnetic memory signals showed different characteristics on the different measured lines.The peak-to-peak value of abnormal peaks increased dramatically in a certain range after fatigue crack initiation.