PARTIAL HYDRODYNAMIC LUBRICATION WITH LARGE FRACTIONAL CONTACT AREAS

An alternative average Reynolds equation for use under conditions of l arge fractional contact area is proposed. The flow factors for this fo rm of the equation are calculated for a variety of longitudinal surfac es and the results are shown to be relatively insensitive to the initi al height distribution. Pressure and shear flow factors for the Christ ensen height distribution and a variety of Peklenik surface pattern pa rameters are also derived from the work of Patir and Cheng, Lo and Tri pp. These are representation by semi-empirical equations over the full range of contact conditions. The implications of the results, with re spect to the lubrication of metal forming processes is discussed.