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Tribology focuses on friction, wear and lubrication of interacting surfaces in relative motion. There is evidence of the development of early forms of both ball and roller bearings in the classical civilizations from 900 B. C. to A. D. 400. The Romans provided the most impressive and interesting examples of, but intriguing evidence of the possible use of rolling bearings was furnished by the Greeks, Celts and Chinese. The term Tribology is derived from the Greek word ‘trobos’ meaning rubbing or sliding.
Wear is the major source of materials wastage and loss of mechanical performance and any reduction in wear can result in considerable savings. Friction is principal cause of wear and energy dissipation. Improving friction control can make a substantial savings. It is estimated that one third of the world’s resources in present use is needed to overcome friction in one form or other. Lubrication is effective means of controlling wear and reducing friction. Tribology is field of science, which applies an operational analysis to problems of great economic importance such reliability, maintainability and wear of technical equipment ranging from household appliances to spacecraft.
An analysis of machine break-down shows that in the majority of cases failures and stoppages are associated with interacting moving parts such as gears, bearings, coupling, cams, clutches, etc. The majority of problems encountered are for Tribology.