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Definition of boundary lubrication. When
a complete fluid film does not develop between potentially
rubbing surfaces, the film thickness may be reduced to
permit momentary dry contact between wear
surface high points or asperities. This condition is
characteristic of boundary lubrication. Boundary lubrication
occurs whenever any of the essential factors that influence
formation of a full fluid film are missing.
The most common example of boundary lubrication includes
bearings, which normally operate with
fluid film lubrication but experience boundary lubricating
conditions during routine starting and stopping
of equipment. Other examples include gear tooth contacts and
reciprocating equipment.
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