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5. Lubricating properties
These are the most difficult properties to assess, given the complexity of the factors involved. A machine to be lubricated represents a highly complex set of problems, and the interaction of parameters gives each case its own specific character. Compounding the problem is the fact that lubrication itself is not a well-known phenomenon. There are three basic types of lubrication associated with oil film thickness
Hydrodynamic lubrication, which assumes a thick film;
Elastohydrodynamic lubrication, when film thickness can be reduced under high applied loads;
lubrication in smooth or boundary conditions when the film is thin.
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Lubricating properties