An analytical friction model for point contacts subject to boundary and mixed elastohydrodynamic lubrication
Matthew Simpson, Ramin Rahmani, Nader Dolatabadi, Nick Morris, David Jones, C. Samuel Craig
Abstract
An analytical EHL model suitable for highly loaded point contacts operating in mixed and boundary regimes of lubrication is presented. The results are compared and validated with the experimental measurements of friction coefficient from an MTM tribometer. Measurements are carried out upon a PAO40 oil at medium to high temperatures. In general, a good agreement in trend and magnitude over a wide range of operating conditions is observed. Both the experimental findings and the model predictions show an inverse relationship between friction and contact load in mixed and boundary regimes of lubrication, an effect not hitherto reported in literature.
Topics & Concepts
TribometerLubricationBoundary lubricationMechanicsMaterials scienceBoundary (topology)TribologyRange (aeronautics)Point (geometry)Friction coefficientInverseThermodynamicsComposite materialPhysicsMathematicsGeometryMathematical analysisGear and Bearing Dynamics AnalysisAdhesion, Friction, and Surface InteractionsTribology and Lubrication Engineering