为研究磁场对铁磁试件力磁信号分布规律的影响,对不同附加环境磁场下的45#钢试件进行静载拉伸试验,检测试件表面的磁记忆信号B的大小,并对试件在不同附加环境磁场下的力磁耦合关系进行分析讨论.试验结果表明:在磁场环境作用下B随应力增大而增大,在屈服点附近达到最大值,此后各点B值基本保持稳定;附加环境磁场并未改变力磁信号的变化规律,但可增加磁记忆信号的大小数值,且磁化状态变化量D随着附加环境磁场的增大而增大,当H为240 A/m时达到最大,随后开始减小;在塑性变形阶段,力磁信号表现为先减小后增大的磁化反转现象.故附加环境磁场不影响金属磁记忆技术的定性评价,但影响定量评价,因此可用磁记忆检测技术来判断铁磁试件的力磁耦合特征,对金属磁记忆定量检测的进一步研究具有重要意义.%In order to study the effect of magnetic field on the distribution law of force-magnetic signal in ferromagnetic specimen, static tensile test is carried out on 45# steel specimens under different additional environmental conditions to examine the size of the magnetic memory signal on the surface of the test specimen and analyze and discuss the force-magnetic coupling relationship of the specimen under different additional magnetic fields. The results show that, under the action of magnetic field, the magnetic memory signal B increases with the increase of stress, it reaches the maximum value near the yield point, and then the magnetic memory signal B is basically stable. The additional environmental magnetic field does not change the variation law of the force-magnetic signal, but it can increase the magnitude of the magnetic memory signal, and the change of the magnetization state D increases with the increase of the additional environmental magnetic field. It reaches the maximum value when H is 240 A/m, and then begins to decrease. In the plastic deformation stage, the force-magnetic signal shows the magnetization reversal phenomenon that it decreases first and then increases. So the additional environmental magnetic field does not affect the qualitative evaluation of metal magnetic memory technology, but affects the quantitative evaluation. Therefore, magnetic memory detection technology can be used to judge the force-magnetic coupling characteristics of ferromagnetic specimen, which is of great significance for the further study of quantitative detection of metal magnetic memory.
展开▼
