静载拉伸过程中三维磁记忆信号的变化特征

The Characteristics of Three-dimensional Magnetic Memory Signals during Static Tension Process

基于三维磁敏传感单元,研究了不同载荷激励下FV520B钢试件表面三维自发射漏磁信号的变化及分布特征,分析了磁记忆信号的不同特征参量,并探讨了该特征参量与轴向应力之间的相关性。结果表明:三维弱磁信号在加载阶段和断裂后均呈现不同的变化特征,根据断裂后激变信号特征可对失效部位进行准确定位;磁记忆信号特征参量与外加应力之间存在一定的相关性,Bxave和KBz特征量与外加应力之间近似呈线性变化,根据该特征量的变化可以判断试件承受的工作应力;根据特征值KBz和Byave随应力的变化关系可以区分试件的弹、塑性变形阶段;三维磁记忆技术可为复杂零构件的损伤判定提供指导。

Based on the three-dimensional magnetic sensor,the variation characteristics of three-dimensional selfemitting magnetic signals of FV520 Bsteel were studied under different tensile loads,and different characteristic parameters of magnetic signals were analyzed and the correlations between parameters and applied stress were explored.The results indicated that three-dimensional magnetic memory signals showed different variation features during tensile process and fracturing,and could accurately locate the site of failure according to the signal changes.Meanwhile,there was a certain correlation between the parameters and applied stress,the relationship between applied stress and parameters of Bxaveand KBzwas approximately linear and the applied stress of the specimens could be predicted based on the eigenvalues.The elastic and plastic deformation stages could be distinguished according to the relationship between stress and parameters of KBzand Byave.Three-dimensional magnetic memory technology would provide guidance on how to identifythe damage of complex components.