Rheological properties of greases in ehd contacts

A rheological model of four characteristic parameters is proposed to describe the effective viscosity of greases in ehd contacts. Experimental determinations of film thickness have been achieved in line and point contacts. The proposed model fits the viscometric results better than a Herschel-Bulkley model and allows calculation of the grease viscosity at the high shear rates found in a typical ehd contact. Rules are given to find the effective viscosity of greases in a practical situation