基于力磁耦合的金属磁记忆检测机理与仿真

针对金属磁记忆检测技术目前尚不能对微观缺陷进行定量检测的问题,在分析基于力磁耦合的金属磁记忆检测机理的基础上,利用Jiles力磁耦合准则及宛福德的磁性物理学,推导出了磁导率与应力之间的数值关系,并通过ANSYS有限元仿真软件建立了二维力磁耦合模型,研究了微观缺陷深度和宽度对构件表面空间中磁记忆信号的影响规律。仿真结果表明：通过提取磁记忆信号法向分量峰峰值之间的间距可以对微观缺陷的宽度进行定量,提取磁记忆信号法向分量的峰值可以对微观缺陷的深度进行定量。

The Basic Theory and Simulation Research on Metal Magnetic Memory Based on Stress-Magnetization

Aimed at the problem of metal magnetic memory that the microcosmic cracks cannot be evaluated quantitatively by the metal magnetic memory testing method at present, the numerical value relation between the magnetic conductivity and stress is derived based on the analysis of the metal magnetic memory testing mechanism by using the theory of Jiles, who discussed the physical mechanism of the stress-magnetization effect. The finite element analysis of stress-magnetization effect is done on steel plate specimen with a microcosmic crack using ANSYS. Through the analysis, using an applicable magneto-elastic coupling model and distilling the peak value''s distance and peak value of metal magnetic memory can evaluate the breadth and deepness of microcosmic cracks quantitatively.