Frictional heat load and wear are two important factors for the damage and failure of the friction pair of the wet clutch.Both have a more complicated mapping relationship with the working condition parameters and interact.Based on finite element simulation and clutch bench test,the critical radial temperature difference of friction element buckling deformation was calculated using the 3σ criterion,and the critical wear rate was obtained by fitting and interpolation of experimental data.The damage threshold model of dual-parameter coupling effect was constructed through BP neural network training,and the validity and accuracy of the model were verified through experiments.The results show that the critical radial temperature difference and wear rate have a non-linear relationship with the operating parameters (pressure and speed).The critical radial temperature difference of the mating steel plate decreases with the increase of pressure and speed,and the wear rate of the friction plate increases with the increase of pressure and speed.The overall error between the predicted results of the dual-parameter threshold model and the measured results is generally less than 7%.Compared with the buckling theory model and the single-parameter threshold model,the predicted results of this model are closer to the measured values,and can accurately predict the damage and failure of friction elements of wet clutches.