基于磁滞回线原理的铁磁性材料应力测试方法

Stress test method for ferromagnetic materials based on hysteresis loop principle

提出了一种检测铁磁性材料应力的新方法。铁磁性材料的磁致伸缩特性与材料本身的微观结构有关,材料的微观结构会随着自身应力状态的改变发生一定的改变。由此,根据铁磁性材料的磁滞现象,对试件施加应力,通过基于磁致伸缩的电磁超声检测(EMAT)平台,得到不同应力下磁滞回线对应的超声信号幅值-静态激励电流关系曲线。提取曲线中的特征参数,绘制出特征参数-应力值关系曲线。试验结果表明,此方法可定性检测出材料的应力状态。

This paper presents a new method for detecting the stress of ferromagnetic materials.The magnetostrictive properties of ferromagnetic materials are related to the microstructure of the material,which itself changes with its own stress state.According to the hysteresis phenomenon of ferromagnetic materials,stress is applied to the specimen,and the curve of ultrasonic signal amplitude-static excitation current corresponding to the hysteresis loop is obtained by the EMAT platform based on magnetostriction.The characteristic parameters in the curve can be extracted and the characteristic parameter-stress value curve can hence be drawn.Experimental results show that this new method can qualitatively detect the stress state of ferromagnetic materials.