Impact wear testing machine

Abstract

An impact testing machine has been built to aid in the study of wear occurring on surfaces of repetitively loaded solid bodies. In this testing machine, bullet-shaped projectiles are bounced against a metal surface which is either stationary or rotating about an axis parallel to the approach of the projectiles. Wear can occur on both the projectile and on the surface it strikes, and both may be measured; however, unless impacts are synchronized, observation of progressive wear must be restricted to the projectile surface. These measurements made on the bullet surfaces yield information on “one-body wear”. The rotation of the impacted medium is expected to facilitate a study of the relative importance of sliding when the relative approach of the two bodies has a tangential as well as a normal component. In this paper the testing machine is described, and some typical photographs of impacted specimens are shown at various stages of wear.