Knowra Wear Wear Wear is the loss or deformation of material caused by contact and relative motion between surfaces. Its forms depend on how surfaces interact and on the materials and environment involved.
Adhesive wear : Material loss or transfer caused when contacting surface asperities adhere and then separate during sliding. Microscopic junctions between sliding surfaces can tear material from one side or transfer it to the other.
Tribology : The study of friction, lubrication, and wear between interacting surfaces. Wear is one of tribology’s central phenomena, alongside friction and lubrication.
Wear testing : Experimental methods for measuring material loss or surface damage under controlled contact conditions. Tests compare materials and treatments, though results depend on how closely conditions match service.
Corrosion : The deterioration of a material through chemical or electrochemical reaction with its environment. Corrosion can occur without surface motion, though it can interact with mechanical wear.
Abrasive wear : Surface damage caused when hard asperities or particles cut, plow, or scratch a softer material. Hard surface features or debris remove material as surfaces move against one another.
Friction : Resistance to relative motion between bodies in contact. Friction accompanies many wearing contacts and can affect heat generation and material removal.
Wear-resistant materials : Materials selected or engineered to withstand material loss and surface damage in service. Material choice can reduce wear where contacting parts cannot be separated.
Erosion : The removal of material from a surface by fluid flow, particles, or other environmental agents. Erosion may resemble wear but does not require two solid surfaces sliding against each other.
Surface fatigue : Progressive material damage caused by repeated or fluctuating stresses at or near a surface. Repeated contact stresses can initiate cracks that release fragments through pitting or spalling.
Surface roughness : The fine-scale deviations from an ideal surface, measured by height, spacing, and shape. Surface asperities determine how real contacts form and where local wear begins.
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