工程科学学报，第40卷，第5期：565-570,2018年5月 Chinese Journal of Engineering,Vol.40,No.5:565-570,May 2018 DOI:10.13374/j.issn2095-9389.2018.05.006;http://journals.ustb.edu.cn 拉压不同应力对磁记忆信号的影响及机理 冷建成)四，田洪旭)，郭亚光)，徐明秀) 1)东北石油大学机械科学与工程学院，大庆1633182)哈尔滨工业大学航天学院，哈尔滨1500013)北京科技大学数理学院，北京 100083 区通信作者，E-mail:bylje(@163.com 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 面的飚信号变化特征.结果表明：拉伸载荷对合成飚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. 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 Effect of tensile and compressive stresses on magnetic memory signal and its mechanism LENG Jian-cheng,TIAN Hong-xu,GUO Ya-guang,XU Ming-xiu 1)School of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,China 2)School of Astronautics,Harbin Institute of Technology,Harbin 150001,China 3)School of Mathematical and Physics,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:Ibyljc@163.com ABSTRACT 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 re- sults are consistent with the experimental data,which can be used for theoretically explaining different mechanisms induced by tensile and compressive stresses. KEY WORDS magnetic memory effect;tensile and compressive stress;stress demagnetization;on-line monitoring 被誉为21世纪最有前景的绿色无损检测技术难以胜任的应力集中、微观缺陷等早期隐性损伤检 之一的金属磁记忆技术，由于具有非接触测量、无需 测，磁记忆技术具有明显的优势山) 磁化激励、检测结果重复性好等诸多优点自提出以 在磁记忆机理及试验方面，国内外学者已开展 来就受到普遍关注.尤其是对于常规无损检测方法 了大量研究工作，提出者Dubov通过室内及现场研 收稿日期：2017-07-18 基金项目：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)工程科学学报,第 40 卷,第 5 期:565鄄鄄570,2018 年 5 月 Chinese Journal of Engineering, Vol. 40, No. 5: 565鄄鄄570, May 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 05. 006; http: / / journals. ustb. edu. cn 拉压不同应力对磁记忆信号的影响及机理 冷建成1)苣 , 田洪旭1) , 郭亚光2) , 徐明秀3) 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 苣 通信作者, E鄄mail: lbyljc@ 163. com 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郾 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鄄鄄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. 关键词 磁记忆效应; 拉压应力; 应力退磁; 在线监测 分类号 TG115郾 28 收稿日期: 2017鄄鄄07鄄鄄18 基金项目: 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鄄鄄Q16035) Effect of tensile and compressive stresses on magnetic memory signal and its mechanism LENG Jian鄄cheng 1) 苣 , TIAN Hong鄄xu 1) , GUO Ya鄄guang 2) , XU Ming鄄xiu 3) 1) School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, China 2) School of Astronautics, Harbin Institute of Technology, Harbin 150001, China 3) School of Mathematical and Physics, University of Science and Technology Beijing, Beijing 100083, China 苣 Corresponding author, E鄄mail: lbyljc@ 163. com ABSTRACT 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鄄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鄄鄄A magnetomechanical effect was improved by introducing different stress demagnetization terms caused by tensile and compressive stresses, and the simulation re鄄 sults are consistent with the experimental data, which can be used for theoretically explaining different mechanisms induced by tensile and compressive stresses. KEY WORDS magnetic memory effect; tensile and compressive stress; stress demagnetization; on鄄line monitoring 被誉为 21 世纪最有前景的绿色无损检测技术 之一的金属磁记忆技术,由于具有非接触测量、无需 磁化激励、检测结果重复性好等诸多优点自提出以 来就受到普遍关注. 尤其是对于常规无损检测方法 难以胜任的应力集中、微观缺陷等早期隐性损伤检 测,磁记忆技术具有明显的优势[1] . 在磁记忆机理及试验方面,国内外学者已开展 了大量研究工作,提出者 Dubov 通过室内及现场研