Homogenization coefficients for modeling the partial and full-film lubrication regimes.

Most mechanical systems have mating interfaces that require effective lubrication for smooth functioning. Thus, understanding and accurately modeling lubrication regimes is an essential research task. The present work proposes a set of normalized coefficients based on homogenization and stochastic theories to model the partial and full-film lubrication regimes between a smooth and a rough surface. The modified Greenwood and Williamson theory, considering inter-asperity-interactions, was used to model the contact-zones. Subsequently, the film-thickness was evaluated and the homogenized Reynolds equations were solved to compute the normalized coefficients. The estimated coefficients were compared with Patir and Cheng's flow-factors, and the similarities and disagreements between both approaches were discussed. New sets of coefficients for running-in surfaces were proposed for modeling their lubrication regimes. • Normalized homogenization coefficients are evaluated based on stochastic analysis. • Inter-asperity interactions have been considered to model the solid contacts. • New sets of homogenization coefficients for running-in surfaces are proposed. [ABSTRACT FROM AUTHOR]