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Autori: Bercea, M., Paleu, V., Bercea, I.
Editorial: Leaf Coppin, Lubrication Science, Leaf Coppin Publishing Ltd., 17 (1), p.3-24, 2004.
This paper reports on the influence of a polymer additive on the traction behaviour of a mineral oil investigated using a two-disc machine at different temperatures and contact pressures. A semi-empirical approach was used for determining the effective lubricant rheological parameters – the elastic shear modulus, the viscosity of the lubricant, and the limiting and Eyring stresses – in elastohydrodynamic contacts. Using this approach, the effect of polymer concentration on the rheological parameters that appear in both Johnson-Tevaarwerk and Bair-Winer models was quantified. The influence of operating conditions, such as pressure, oil temperature, and polymer concentration, on the traction coefficient, limiting shear stress (from the Bair-Winer model), Eyring stress (from the Johnson-Tevaarwerk model), shear modulus, and apparent viscosity was also investigated.
Cuvinte cheie: ulei mineral, aditiv polimeric, tractiune EHD, parametri reologici, tensiune de forfecare limita, tensiune de forfecare Eyring, modul de forfecare a lubrifiantului // mineral oil, polymer additive, EHD traction, rheological parameters, limiting shear stress, Eyring shear stress, lubricant shear modulus