拉伸及疲劳载荷对低碳钢磁记忆信号的影响  

Influence of Tension and Fatigue Load on the Low Carbon Steel Magnetic Memory Signals

作　　者：董丽虹[1] 徐滨士[1] 董世运[1] 尹大伟[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室

出　　处：《中国机械工程》2006年第7期742-745,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助重点项目(50235030)

摘　　要：为探索金属磁记忆现象的物理本质,深入研究载荷对磁记忆检测信号的影响,在MTS810型液压伺服试验机上对低碳钢板状试件分别施加静载拉伸载荷及拉-拉疲劳载荷,采用EMS-2003型金属磁记忆与涡流诊断仪检测加载过程中磁记忆信号的变化。结果表明:施加载荷前试件表面的初始磁状态不同;加载过程中两种加载方式均使磁记忆信号曲线由初始的随机分布转变为较有规律分布,静载拉伸试件弹性变形阶段与塑性变形阶段的磁信号曲线具有明显差异,疲劳试验不同循环周次下磁信号曲线相似;断裂瞬间断口处磁信号激变,两端极性相反;疲劳加载过程中过零点由初始磁状态的随机位置逐渐漂移集中在断口处。In order to explore the physical mechanism of metal magnetic memory and load effects on the metal magnetic memory signals, static tension and fatigue tests of low carbon steel sheet specimens were performed on MTS810 hydraulic testing machine. Magnetic memory signals were measured during the testing process by metal magnetic memory instrument （Model：EMS--2003）. The results show. the initial magnetic signals of specimens are different before loading;the magnetic signal curves are transformed from irregular to regular pattern due to the two type of load influences. However, the shape and distribution of magnetic signal curves in the elastic stage are different from that of the plastic stage;the value of magnetic signals on the fracture area increases dramatically at the breaking transient time. The zero crossing points of initial magnetic curves shift to the fracture area.

关 键 词：磁记忆 拉伸载荷 疲劳载荷 磁信号 

分 类 号：TG115.28[金属学及工艺—物理冶金]