Comparative investigation of the contact coated rough surface coatings using the indentation and flattened methods

Abstract

A comparison between the indentation and flattened model for the contact of coated asperities during the elastic deformation was analyzed. The influence of the coating thicknesses and elastic moduli ratios on the two methods was studied in a wide range of materials (including soft and hard coatings). The constitutive relationships of the transition parameters and the effective modulus of elasticity were established by numerical fittings. The contact relations of the coated asperity were applied to the coated rough surfaces basing on the GW model. The influence of coating thicknesses, material properties and the surface roughness of substrate on the deformation of the coating surface were explored. The equivalent plasticity index of the two models were compared during the elastic deformation till to the limit. The reasons for the differences are discussed. This study provides a theoretical foundation for the friction and wear of the coated rough surfaces.