磁导率检测技术对430不锈钢构件检测的最优激励频率设计研究

Research on optimal excitation frequency of 430 stainless steel components detection based on permeability testing technology

磁导率检测技术是一种可高精度评价铁磁构件整体或部分区域应力集中、疲劳损伤状况的无损检测方法。依据磁导率检测原理,以430铁素体不锈钢试件为研究对象,研究激励电压幅值、激励线圈匝数、检测线圈匝数及外加拉应力对检测传感器最优激励频率的影响。研究发现,最优检测频率随激励线圈匝数的增加而减小;最优检测频率与外加拉应力有关,当外加拉应力超出试件的弹性变形阶段时,最优频率随拉应力的增大而增大;最优检测频率不随激励电压幅值、检测线圈匝数的变化而变化,但随着激励电压幅值、检测线圈匝数的增加,检测灵敏度升高。该研究结论可为灵敏传感器的设计提供参考。

The permeability testing technology is a non-destructive testing method that can evaluate the stress concentration and fatigue damage of the whole or part of the ferromagnetic component with high precision.Based on the principle of permeability detection, taking 430 ferritic stainless steel specimen as the research object, the effects of the excitation voltage amplitude, the number of turns of the excitation coil, the number of turns of the detection coil, and the tensile stress on the optimal excitation frequency of the detection sensor were studied. The study shows that the optimal detection frequency decreases with the increase of the number of turns of the exciting coil;The optimal detection frequency is related to the external tensile stress, and when the external tensile stress exceeds the elastic deformation stage of the test piece, the optimal frequency increases as the tensile stress increase;The optimal detection frequency does not change with the excitation voltage amplitude, the number of turns of the detection coil, but with the increase of the excitation voltage amplitude, the detection coil turns, the detection sensitivity increases. The conclusion of this study can provide reference for the design of sensitive sensors.