Abstract
Surfaces sliding against each other will experience wear. This chapter addresses the situation where there are no hard particles present, and considers the mechanisms by which material becomes removed under the influence of mechanical forces, local temperature rise and chemical reactions. Experimental methods for producing, measuring and studying wear in the laboratory are described. Archard's classical model for sliding wear is presented and discussed. Surface and subsurface features caused by wear are reviewed and the mechanisms involved in the sliding wear and fretting wear of metals are discussed in detail, together with the effects of lubrication. The wear of engineering ceramics and polymers shows some similarities but also important differences from the wear of metals, and the behaviour of these classes of materials is reviewed.
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