In order to carry out the damage tolerance design of wheel

the crack propagation characteristics were studied by fractographic restrostimation and crack propagation simulation analysis. The crack growth rate was determined according to the fatigue striation. Close to crack length of 2 mm

the crack growth rate increased significantly

acting as the transition region of the first and second loading stages; in the stable crack growth zone

crack length had a bilinear logarithmic relationship with the crack growth rate; the list gradient method and Paris formula method were used to reversely calculate the fatigue life

and the fatigue life was 163% higher than the cycles of the second loading stage. The simulated values of crack growth in the stable stage of crack propagation coincided with the values of fracture inversion

but the simulated values in the unstable stage were less than the values of fracture inversion

and the error was -215%. Based on the above research

a reasonable table for a centrifugal wheel was determined. The life of wheels in unstable stage accounted for 248%-357% of the life of internal crack surface growth stage

so accurate calculation was of great significance.