Fatigue Crack Growth Property of ADB610 Steel under Decreasing-K Testing Method

10 CT samples with the same size and the same sampling and processing method, were obtained from ADB610 steel plate of 20 mm thickness, and fatigue crack growth test was carried out using decreasing-K testing method. The relation between crack growth length a and crack growth life N was obtained. The fatigue crack growth rate equation based Paris of each sample was calculated respectively using seven point fitting method and MATLAB software. The average values of parameters in Paris equations of 10 samples could be calculated, and it was obtained for the average fatigue crack growth rate equation based Paris. The fatigue crack growth property of ADB610 steel using decreasing-K testing method was also got.