在离线情况下，利用金属磁记忆二维扫查装置测量45钢试样的磁记忆信号二维分量。通过对磁记忆信号二维分量进行微分处理得到相关分量的梯度，进而合成磁记忆信号的李萨如图形。通过分析李萨如图形区域面积与拉伸载荷之间的变化特性，对材料中应力集中进行定量评估。试验结果表明：对试样进行拉伸时，缺口处磁记忆信号变化特征比较显著，有利于对应力集中位置的确定；切向分量的信号峰值与拉伸载荷之间的相关性更好；李萨如图形区域面积大小与拉伸载荷呈正相关变化趋势，通过对李萨如图形面积大小进行非线性拟合可得到材料的应力集中定量评估判定曲线。

In the case of offline, the magnetic memory signal of the 45 steel sample was measured by a metal magnetic memory two-dimensional scanning device. The two-dimensional components of the magnetic memory signal are subjected to differential processing to obtain the gradient of the relevant components, and the Lissajous graph of the magnetic memory signal is synthesized. By analyzing the variation characteristics between the area and the tensile load of the image, the stress concentration in the material can be quantitatively evaluated. The experimental results show that the change of the magnetic memory signal in the gap is significant when the specimen is stretched, which is favorable for the determination of the stress concentration. The correlation between the peak value of the tangential component and the tensile load is better. The size of the area is positively correlated with the tensile load, and the curve of the stress concentration of the material can be obtained by nonlinear fitting of the size of the image area.