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Elastohydrodynamic Lubrication

Glossary Term

Definition and Purpose

Elastohydrodynamic Lubrication (EHL) is a regime of lubrication that occurs when elastic deformation of the surfaces in contact is significant under high pressure, and a lubricant film is present. This phenomenon is typically observed in machine elements such as rolling element bearings and gears, where the combination of high load and motion leads to the formation of a lubricant film that is sufficiently thick to separate the contacting surfaces, thus reducing wear and friction.


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