ESTIMATION DYNAMIC VISCOSITY OF THE LUBRICANT MATERIALS IN TRIBOLOGICAL CONTACT

Abstract

There is presented the example of the separate determination of the dynamic viscosity of structuredboundary lawyers in the lubricant material of non-hydrodynamic nature in the period ofstart-up and the general dynamic effective viscosity at stabilization of tribological parametersin the contact. General legitimacy established during the long-term investigations of mineraland synthetic oils for hydro-mechanical transmissions is increasing effective viscosity of theadsorption boundary layers, reduction the gradient of shear stress of lubricant materials on theactivated by friction contact surfaces and obtaining properties of non-Newtonian fluids. It wasdetermined that the high shear gradients oil layer during breaking-in and increasing the temperaturein contact zone caused decreasing of the general dynamic effective viscosity of lubricantmaterials at operating time.