Abstract
The elastohydrodynamic lubrication (EHL) film thickness of polymer thickened oils in sliding point contact has been measured by optical interference method.Generally, the oil film thickness in EHD contact depends on three variables, i. e., viscosity, sliding speed, and load. The film thickness increases with increase in the bulk viscosity of the base oil and with increase in the sliding speed. The EHL film thickness decreases slightly as the load increases. However, the experimental data suggest that the EHL film thickness of polymer thickened oils is almost independent of bulk viscosity of the doped oils. It seems that the major portion of the polymer additives may be separated from the base oil at the oil inlet zone of EHL contact or the molecular degradation of polymer as a result of being sheared in the EHL contact.
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