Fatigue life evaluation procedure and its application for turbine disk

A fatigue life evaluation procedure of a turbine disk was established, and illustrated with a turbine rotor model, meanwhile a simulating test design method of turbine disk assessment sites was explored. The results show that the established life evaluation procedure has good engineering practicability. The developed method of determining the equation parameters could take advantage of the material experimental data effectively, and a group of parameters could be obtained by this method. Precision of the prediction life by using the method lied in two times scatter band. The stress gradient was the key influential factor to the fatigue life near the bore, bolt hole and transitional fillet of the turbine disk, for which enough attention should be paid in the design stage. Stress gradient features of the critical positions in the turbine disk were simulated using a plate model with notches, and the simulation results agreed well with the test results. A modeling test design method was provided for life evaluation of the turbine disk test pieces with notches.