拉压不同应力对磁记忆信号的影响及机理  

Effect of tensile and compressive stresses on magnetic memory signal and its mechanism

作　　者：冷建成[1] 田洪旭[1] 郭亚光 徐明秀[3] LENG Jian-cheng;TIAN Hong-xu;GUO Ya-guang;XU Ming-xiu(School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, China;School of Astronautics, Harbin Institute of Technology, Harbin 150001, China;School of Mathematical and Physics, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]东北石油大学机械科学与工程学院,大庆163318 [2]哈尔滨工业大学航天学院,哈尔滨150001 [3]北京科技大学数理学院,北京100083

出　　处：《工程科学学报》2018年第5期565-570,共6页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(11472076,51607035);黑龙江省博士后科研启动基金资助项目(LBH-Q16035)

摘　　要：通过对Q235钢退磁试件的拉伸、压缩试验,利用磁记忆在线监测系统实时跟踪记录了不同拉压应力作用下试件表面的磁信号变化特征.结果表明：拉伸载荷对合成磁场的影响是先减小后增加的,在接近材料屈服强度的0.3倍左右后趋于稳定不变;而压应力引起的合成磁场初期快速下降,之后处于上下波动变化.通过引入拉压应力所产生的不同应力退磁项,对J-A磁机械效应模型进行了改进,模拟结果与试验数据具有较好的的一致性,可用于拉压不同应力致磁机理的理论解释.The tensile and compressive stresses of demagnetized specimens made of Q235 steel were tested,and magnetic signal variation characteristics under different tensile and compressive stresses were continuously recorded using a magnetic memory on-line monitoring system. The results demonstrate that the resultant magnetic field first decreases and then increases induced by tensile load and becomes stable when approaching and exceeding 0. 3 times the yielding strength of the material,while the resultant magnetic field induced by compressive stress rapidly decreases in the initial stage and then fluctuates. The model for J-A magnetomechanical effect was improved by introducing different stress demagnetization terms caused by tensile and compressive stresses,and the simulation results are consistent with the experimental data,which can be used for theoretically explaining different mechanisms induced by tensile and compressive stresses.

关 键 词：磁记忆效应 拉压应力 应力退磁 在线监测 

分 类 号：TG115.28[金属学及工艺—物理冶金]