Abstract
Abstract An elastic-plastic coated rough surface contact model is presented, which incorporates existing single coated asperity contact models in a GW-based statistical multi-coated-asperity surface model. Effects of the coating thickness and its material properties as well as the substrate surface roughness on the mode of the coated surface contact deformation and its contact behavior are investigated through a qualitative parametric analysis. An equivalent plasticity index for the coated surface contact is defined to determine the mode of the coated surface contact deformation, which mainly depends on the coating material properties and the substrate surface roughness. It is found that a coated surface with a thicker, stiffer, harder coating and a rougher substrate has a higher separation and smaller real contact area under a given load.
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