The influence of gear surface roughness on rolling contact fatigue under thermal elastohydrodynamic lubrication with slip

摘要

Measured shot peened, ground and worn surfaces were included in thermal elastohydrodynamic lubrication and fatigue simulations. Considering transient temperature fields, shear limit and metal to metal contact, moderate negative slip was found to be more detrimental than positive. The location of pitting in gears was thus explained by the surface roughness and the slide to roll ratio. The lambda-ratio correlated with fatigue risk within each surface structure. As a supplement to the lambda-ratio the surface skewness qualitatively ranked the fatigue risk between the surface structures.