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One of the ageing mechanisms of an asset. A leading indicator of distress and potential failure (P) or functional failure (F) of an asset.

In materials science, wear is the erosion of material from a solid surface by the action of another solid. The study of the processes of wear is part of the discipline of tribology.

There are four principal wear processes:
The definition of wear does not include loss of dimension from plastic deformation, although wear has occurred despite no material removal. This definition also fails to include impact wear, where there is no sliding motion, cavitation, where the counterbody is a fluid, and corrosion, where the damage is due to chemical rather than mechanical action.

See also:
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