The influence of gear surface roughness on rolling contact fatigue under thermal elastohydrodynamic lubrication with slip
Carl-Magnus Everitt, B. Alfredsson
Abstract
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 λ-ratio correlated with fatigue risk within each surface structure. As a supplement to the λ-ratio the surface skewness qualitatively ranked the fatigue risk between the surface structures.
Topics & Concepts
Materials scienceLubricationSurface roughnessSlip (aerodynamics)Surface finishThermalFatigue limitComposite materialSkewnessMetallurgyMechanicsEngineeringThermodynamicsPhysicsStatisticsAerospace engineeringMathematicsGear and Bearing Dynamics AnalysisTribology and Lubrication EngineeringAdhesion, Friction, and Surface Interactions