Quantitative model of cracks generated at hole edge corrosion on Aluminum alloy plate based on Lamb wave

Aluminum alloy structures are prone to be corroded around holes, and small cracks are easy to initiate around the corrosion area, which has great risk to structure health. So, it is necessary to quantitatively detect the crack and predict its propagation trend. In this paper, different length of cracks generated at hole edge corrosion is manufactured and ScanGenie-II integrated structural health monitoring system is applied to collect signals. The amplitude values of health signal and damage signal of Lamb wave S 0 mode are used to establish damage index. After Hilbert-Huang Transform, 5 types of models are established to quantitatively describe cracks. Finally, the Fourier fitting model with R-square of 0.9863 and adjusted R-square of 0.9787 is selected, which can describe the trend better.