Thermal-mechanical crack propagation model and its parameters determined

A modified model was presented for predicting the thermo-mechanical crack growth. There are two items in the model, including the impact of alternating load, temperature on fatigue crack and creep crack growth, respectively. According to the numerical simulation by the business software ABAQUS, the stress intensity factor K and creep crack tip controlled parameter C_t of the penetrability-crack in the lower slot of aero-engine turbine disk under different operating conditions were obtained. In order to facilitate the engineering application, expressions of the K and C_t were attained as functions of crack length and far-field stress. An example was given to validate the feasibility of the proposed crack growth analysis method.