Multivariate Fatigue Performance Study of 30NiCrMoV12 Defective Axles

There are many forms of foreign object impact defects on the axle, among which the angular impact has a greater impact on the fatigue performance of the axle and will accelerate the failure of the axle. In order to study the influence of angular impact defects on the fatigue limit of the axles, for the 30NiCrMoV12 axle steel, the combination of software simulation and fatigue test is adopted,the stress field analysis of the impact defect area is carried out with the help of ABAQUS, the fatigue test is carried out on the prefabricated defective axle sample, and the fatigue P-S-N curve of each sample group is fitted according to the test result of the approximate Owen one-side tolerance limit method, and the corresponding fatigue limit is obtained. The fatigue limit of the full-size axle is predicted based on the fatigue test results of each specimen group. Considering the dispersion of the impact defect depth, the two parameters of the defect depth and the fatigue limit of the full-size axle are fitted. Finall