IntroductionThe acting lubrication regime, kinematics, and applied loads can be named as the most influencing factors in terms of frictional performance and energy efficiency of machine components. Especially, insufficient lubrication can lead to a tremendously increased coefficient of friction (COF) and/or wear rate thus decreasing the lifetime, stability, and sustainability of those components. Stribeck‐curves combined with the λ parameter (film thickness divided by combined surface roughness of both rubbing surfaces) can be used to classify different lubrication regimes, namely boundary, mixed, and hydrodynamic lubrication. Furthermore, especially for rigid materials in non‐conformal contacts under high pressures, mixed elastohydrodynamic lubrication (EHL) and full film EHL need to be considered. Due to high contact pressures involved, the surfaces may elastically deform and the viscosity of the lubricant can be significantly increased, so that the film thickness may be large enough to completely separate the rubbing surfaces. For rigid materials in conformal contacts under lower contact pressures, hydrodynamic lubrication may form a thick lubricant film that separates both surfaces completely from each other. Increasing the hydrodynamic pressure can lead to an increased load bearing capacity thus supporting higher loads, lower speeds, or less viscous lubricants. In addition, a transition from full film to
Advanced Engineering Materials – Wiley
Published: Jan 1, 2018
Keywords: ; ; ; ; ;
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