Optimizing interlayer and coated film thickness for minimum stress distribution under Elastohydrodynamic Lubrication condition

Abstract

Surface of engineering components like valves, bearing are routinely subjected to contact loading, where large stresses are applied over highly localized area and result in failure of components. In recent years, the technique improving sliding performances have progressed by using coated film and interlayer possessing superior tribological properties. These techniques are often used under severe condition such as Elastohydrodynamic Lubrication (EHL) operating condition. In this work, an optimum design for coated film with an interlayer is analyzed by using a two-dimensional numerical analysis. The bond strength of the coating/substrate and interlayer/coating is one of the important properties of the coating system and therefore it is essential to study the stress distribution and contact width with different ratio of young's modulus Two-dimensional model have been created with substrate only. Contact analysis have been performed with circle on flat plate both being deformable. Optimum young's modulus ratio of coating and interlayer material have been found. Using this particular optimum young's modulus ratio optimum interlayer thickness have been found for which stress generated is minimum.