Author(s)

J. L. Loth, G. J. Morris & R. Ware

Abstract

Most material frictionhear testers are variations of the BOCLE@ tester. It uses a rotating or oscillating spindle, loaded down with a weight. The spindle has one or more 0.5 inch diameter balls at its end rubbing over a flat test sample. Wear depends on the inaterlal properties of contacting surfaces: ball(s) and flat test sample. The flat test sample is fixed inside a cup filled with lubricant. The ratio of drag force to contact force provides the friction coefficient. Wear is reported for either material, as weight loss rate, or rate of groove width increase. Wear depends on contact surfaces physical properties, contact pressure, velocity, lubricant and contact temperature. Problems associated with the BOCLE@ tester are vibrations caused by the rotating or oscillating weight on the spindle, d~fficulty in changing the spindle

Keywords