Characterisation of the Viscoelasticity of Engine Lubricants at Elevated Temperatures and Shear Rates

951032

02/01/1995

Event
International Congress & Exposition
Authors Abstract
Content
Most automotive multigrade oils contain high molecular weight polymeric viscosity index improvers (VIIs) and are to a greater or lesser extent, viscoelastic liquids. A way of characterising lubricant viscoelasticity (as typified by the first normal stress difference) using slit die rheometry is described in this paper. This technique has been applied to measure the viscoelasticity of several conventional multigrade oils at temperatures and shear rates close to that experienced by the lubricant in an automotive journal bearing. Additionally, the potential of slit die rheometry as a technique to measure the viscosity of engine oils at shear rates up to 2 X 106s-1 is assessed.
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DOI
https://doi.org/10.4271/951032
Pages
20
Citation
Williamson, B., and Milton, A., "Characterisation of the Viscoelasticity of Engine Lubricants at Elevated Temperatures and Shear Rates," SAE Technical Paper 951032, 1995, https://doi.org/10.4271/951032.
Additional Details
Publisher
Published
Feb 1, 1995
Product Code
951032
Content Type
Technical Paper
Language
English