chapter  8
29 Pages


The highly complex nature of the wear process has made it difficult to develop generalized procedures for predicting its occurrence and intensity. Surface damage or wear can manifest itself in many forms. Among these is the commonly used terminology: pitting, frosting, surface fatigue, surface cracking, fretting, blistering, plastic deformation, scoring, etc. The occurrence of a particular type of wear depends on many factors, which include the geometry of the surfaces, the nature of surface roughness, the applied load, and the rolling and sliding velocities. M. M. Krushchov and N. P. coworkers developed a similar linear relationship between wear resistance and hardness for commercially pure and annealed materials. Corrosive or chemical wear takes place when the environmental conditions produce a reaction product on one or both of the rubbing surfaces and this chemical product is subsequently removed by the rubbing action. Erosive wear is used to advantage in the cutting, drilling, and polishing of brittle materials such as rocks.