A method for calculating the real contact area of blade-disk structure combined with truncation theory between rough surfaces

Abstract

The contact characteristics of the blade-disk structure are difficult to predict due to complex working conditions. This paper presented an improved model to predict its real contact area. Firstly, the deformation state and load of the asperities with different radii on the deterministic rough surface are determined based on improved truncation theory. Subsequently, the real contact area of the blade-disk structure is obtained by combined with the finite element method at a lower computational cost. Finally, the application of the proposed method in the wear prediction of dovetail blade-disk structures is demonstrated, which proves that considering roughness is significant for wear prediction. The proposed method has great potential in predicting the wear characteristics of complex systems under real working conditions.