Modelagem matemática e computacional do contato lubrificado de superfícies em mancais de rolamentos

Abstract

Due to the main cause of failure, inadequate lubrication in one of the mechanical components most used in industrial machinery, electric and combustion motor, hydraulic, steam and wind turbines, in this work the mathematical and computational model is presented by Abaqus® of the lubricated contact between the rough surface of a sphere with the rigid plane, which corresponds to the outer ring track, both components of a rolling bearing. The aim is to analyze the relationship between the slip friction and the shear stresses produced from the lubricated contact between the roughness of the surfaces, on a microscopic scale. It is considered the model of the solid-solid contact without lubrication and the solid-fluid in the regimen of hydrodynamic and mixed lubrication. As input data, the geometry, the properties of the materials making up the moving parts and the relative velocities are applied. And as outputs, the responses in terms of normal and tangential forces, normal and shear stresses, and contact and fluid pressures are obtained. The results demonstrate that the computational model allows to verify the effects of the presence of the lubrication in the contact of surfaces. As the estimated values, through computational simulation, for the coefficients of friction in the hydrodynamic and mixed lubrication regime (close to 0,0045 and 0,014, respectively) presented high precision, that is, they were within the reference range specified in the literature.