What is Wear (erosion)?
{{otheruses}} 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: #Adhesive wear #Abrasive wear #Corrosive wear #Surface fatigue == Explanation == The definition of wear does not include loss of dimension from plastic deformation, although wear can happen without loss of material. Also this definition does not include [[impact]] wear where there is no sliding motion or [[cavitation]] (also [[corrosion]]) where counterbody is a [[fluid]].. Wear, along with other aging processes such as [[fatigue]], [[creep]], and [[Material fracture|fracture]] toughness, causes progressive [[degradation]] of materials with time leading to failure of material at an advanced age. Under normal circumstances, the property changes during usage normally occur in three different stages as follows:- • Primary or early stage or run-in period, where rate of changes can be high. • Secondary or mid-age process where a steady rate of aging process is maintained. The useful or working life is at this stage. • Tertiary or old-age stage, where rapid rate of aging leads to early failure. With increasing severity of environmental conditions, such as, higher temperatures, strain rates, stress and sliding velocities, the secondary stage is shortened and the primary stage tends to merge with the tertiary stage, thus drastically reducing the working life. Surface engineering processes are used to minimize wear and extend working life of material. ==[[Adhesive tape|Adhesive]] wear== Adhesive wear is also known as scoring, galling, or seizing. It happens when two solid surfaces slide over one another under pressure. ==Abrasive wear== This happens when material is removed by contact with hard particles. The particles either may be present at the surface of a second material or may exist as loose