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Tribology Laboratory
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EAR IS THE GRADUAL removal of material from contacting surfaces in relative motion. Analogous to the mechanisms of
friction, there are four basic wear modes that are used in the classification of wear: (1) adhesive wear, (2) abrasive
wear, (3) surface fatigue wear, and (4) tribochemical wear. In adhesive wear, the junctions that give rise to the
resistance to sliding can also cause removal of discrete particles at the asperity junctions. Abrasive wear is similar
to the plowing contribution of friction; the plastic deformation creates wear debris that is eventually ejected from the
contact. In surface fatigue wear and delamination, a variety of cyclic events initiates and propagates cracks. The
cracks eventually become large enough to cause discrete regions near the surface to be ejected as debris. Tribochemical
wear mechanisms involve a coupling between the mechanical and thermal processes occurring at the interface and the
environment. Here the corrosiveness or reactivity of the environment is generally enhanced due to these mechanical and
thermal processes.