People of domestic and foreign non-destructive testing have paid widely attention to the magnetic memory technology which is as the early diagnostic model technology. But the existing magnetic memory technology mainly depends on leakage magnetic field signal in a single direction (normal component) to determine, doesn't make full use of the entire information of magnetic memory signals, prone to undetected miscarriage of justice, etc. Aimed at the deficiency of the detecting technology, two-dimensional testing method which joint conducts characteristic curves of magnetic memory signals of the zero point in normal component and the maximum point in tangential component is introduced. Using this method, the normal component signals and tangential component signals of magnetic memory are collected at the same time, vector resultant method is adopted to extract the maximum value of tangential component signals, then the lissajous figure of synthesis between the gradient of normal component and the gradient of tangential component is obtained, the area of lissajous figure is led in for analyzing the stress state. And the self-developed two-dimensional magnetic memory apparatus are applied to engineering practice. Practice has proved that the two-dimensional system and detection method can efficiently be determined on the stress concentration, and it is expected to be a new method which can achieve the quantitative analysis of magnetic memory testing.

In the paper, the theory of two-dimensional magnetic memory testing is employed. The zero point in the normal component and the maximum point in the tangential component are together adopted for detection. Lissajous figure analysis is introduced. The Lissajous figure of synthesis for the normal and tangential components and the Lissajous figure of synthesis for the differential value of the normal component and the tangential component are used for analysis. It turns out that the area of the Lissajous figure of synthesis for the differential value of the normal and the tangential components can be used to determine the degree of stress concentration, and it is concluded that in different stress concentration degrees, the order of magnitude of the Lissajous figure area can be used as a threshold. This study can provide a test analysis basis for further research on the quantitative analysis of two-dimensional detection of magnetic memory by using the Lissajous figure analysis method.