Abstract
A study was made of the effect of lubricant viscosity on metallic contact and friction in the transition zone between hydrodynamic and boundary lubrication. The system used was one of pure sliding and relatively high contact stress, namely, a fixed steel ball on a rotating steel cylinder. The extent of metallic contact was determined by measuring the electrical resistance between the rubbing surfaces. Increasing the viscosity of Newtonian fluids (mineral oils) over the range from 2 to 1100 centipoises caused a decrease in metallic contact—the effect becoming progressively more pronounced at higher viscosities. The viscosity here was the viscosity at atmospheric pressure and at the test temperature; neither pressure-viscosity nor temperature-viscosity properties appeared to be important factors. On the other hand, non-Newtonian fluids (polymer-thickened oils) gave more metallic contact than their mineral oil counterparts—suggesting that shear-viscosity is important. However, no beneficial effects of viscoe...
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