Impact Contact mechanical Performance evaluation of coated medium by semi-analytical method

Mechanical components are often subject to impact loads during service. It has been proven that application of a solid coating effectively improves contact mechanical performance of the component and prolongs its service life. The present paper proposes a semi-analytical model for elastic solid coatings subjected to impact load, which is based on numerical solution of classical contact theory, combined with a novel step-by-step iterative strategy with respect to impact time and binary search method. A conjugate gradient method (CGM) and discrete-convolution and fast Fourier transform (DC-FFT) algorithm are employed for enhancing computation efficiency of the present model. Comparative studies between results obtained by the proposed model and finite element method (FEM) show the validity of the model. Influences of impact velocities and coating parameters on impact mechanical performance and elastic stress distribution of solid coated medium are further investigated as a step towards understanding the impact contact failure mechanism of coated material or component.