Influence de l'échelle de rugosité sur le frottement dans les contacts lubrifiés.

Abstract

The reduction of friction and the limitation of emissions of greenhouse gases are the main objectives of the automotive industry. This energy e ciency is related to functionalization of the surface of ringpack tribo-system. Multi-stage abrasive nishing process are commonly used to produce the geometrical properties of a surface. This confers technical some functionalities in the operating characteristics relating to their durability and reliability. The texture generated signi cantly a ects the performance of the ring-pack system. In this paper, a numerical model of elasto-hydrodynamic (EHD) contact coupled to a multiscale surface texture modeling was developed. This permtis to to study the scale e ect of surface features and theirs interactions on friction performance and lubricant ow under hydrodynamic lubrication condition. Surface topography can be decomposed in two principal components : super cial roughness modeled using fractal model and valleys modeled by scaling factor. Results show Relationship between friction and surface scales.