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Behavior of Viscosity Index Improver-Containing Oils in Non-Steady State Contacts
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Abstract
A study has been made of the lubricant film-forming properties of viscosity index improver-containing oils in non-steady state, high-pressure contacts. Two types of non-steady speed condition have been investigated, sudden halting of motion and cyclically-varying entrainment speed. Film thickness has been measured in a ball on flat contact using ultra-thin film interferometry. It has been shown that viscosity index improver polymers in solution exhibit an enhanced squeeze behavior during halting and a viscoelastic response to acceleration/deceleration.
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Citation
Gunsel, S., Smeeth, M., and Spikes, H., "Behavior of Viscosity Index Improver-Containing Oils in Non-Steady State Contacts," SAE Technical Paper 982579, 1998, https://doi.org/10.4271/982579.Also In
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