Studies on influences of initial magnetization state on metal magnetic memory signal

Abstract

Metal magnetic memory testing is a novel testing method which can early test stress concentration level of ferromagnetic components. In theory, the influences of the initial magnetization on the magnetic memory signal were studied. In the experimental aspect, take Q235 steel specimen for example, the relationship between initial magnetization state and metal magnetic memory signal was researched by static tensile test under three different initial magnetization conditions. Both the experimental studies and theoretical analysis come to similar conclusion that the variation trend of magnetization with the stress is that the initial magnetization status tends to shift towards the non-hysteresis magnetization state. With the increasing of stress, the magnetizing state gradually shifts towards the anhysteretic magnetization state, and the variation rate is directly proportional to the difference between the initial magnetization and the non-hysteresis magnetization. Our study indicates that the initial magnetization state has an important influence on the magnetic memory signal, and the research results can provide reference for quantitative test of metal magnetic memory testing technology.