CAJ | 학술논문

由U型铁芯和构件的被测部分构成了一个闭合磁路,在U型铁芯上缠绕激励线圈和感应线圈,由激励线圈中的电流信号与感应线圈中的电压信号测绘出不同应力条件下被测试样的未饱和磁滞回线,得出试样矫顽力H_c与外加拉应力、由塑性变形引起的残余应力之间的关系.外加拉应力使材料的矫顽力Hc减小,而残余应力在材料内部产生位错的钉扎效应使矫顽力H_c增大.冷作硬化过程中,材料矫顽力H_c的变化为外加应力与残余应力综合作用的结果.
유U형철심화구건적피측부분구성료일개폐합자로,재U형철심상전요격려선권화감응선권,유격려선권중적전류신호여감응선권중적전압신호측회출불동응력조건하피측시양적미포화자체회선,득출시양교완력H_c여외가랍응력、유소성변형인기적잔여응력지간적관계.외가랍응력사재료적교완력Hc감소,이잔여응력재재료내부산생위착적정찰효응사교완력H_c증대.랭작경화과정중,재료교완력H_c적변화위외가응력여잔여응력종합작용적결과.
A magnetic yoke containing an induced coil and indirect pickup coil along with a part of the sample make up a closed magnetic circuit.The magnetic minor hysteresis loops of a low carbon steel sample were measured by using voltage signal from pickup coil and current signal from induced coil.As a result, the relationship between coercive force H_c and the applied stress, as well as the effect of residual stress on the coercive force H_c was obtained.It was found that in the elastic region, the coercity is inclined to decrease when there is an increase of external stress due to domain reorientation, while in the plastic stage, it increases almost proportionally with the increase of external stress as a result of dislocation pinning effect.After the cold working, the variation in H_c is attributed to the joint effects of the applied stress and residual stress on domain wall motion.