An approach for determination of lubricant properties at elliptical elastohydrodynamic contacts using a twin-disc test device and a numerical traction model

摘要: High-pressure lubricant properties are important when friction coefficients and power losses evaluated in elastohydrodynamic (EHL) contacts. An approach was developed to determine the limiting shear stress actual viscosity of lubricants using a numerical traction model based on elliptical EHL contact curves, measured at wide range temperatures pressures with twin-disc test device. The tests were carried out pure fluid film high Hertzian finely polished surfaces. Each tested 135 points, where bulk measured. parameters adjusted so that calculated results matched experimental measurements all points. In general, there is good correlation between measurements. influence pressure less significant for polyalphaolefin (PAO) oil ...