Accession Number : ADA190145

Title :   A New Method of Measuring Multigrade Oil Shear Elasticity and Viscosity at High Shear Rates,

Corporate Author : WISCONSIN UNIV-MADISON DEPT OF ENGINEERING MECHANICS

Personal Author(s) : Lodge, Arthur S

PDF Url : ADA190145

Report Date : Jan 1987

Pagination or Media Count : 20

Abstract : Recent journal bearing oil film thickness data (1) strongly suggest that, in order to develop minimum-viscosity multigrade oils for maximizing fuel economy, it is not enough to examine viscosity n alone, it is essential also to examine a certain kind of shear elasticity, of which one measure is the first normal stress difference N1 in shear flow. Within a group of isoviscous multigrade oils, N1 values can differ significantly; for 10W-40 and 15W-40 oils, an average of 75% of the minimum oil film thickness can be attributed to N1. Keywords: Lubrication, Oil shear elasticity, First normal stress difference, Oil viscosity, Stressmeter, High shear rate, Reprints.

Descriptors :   *LUBRICATING OILS, COST EFFECTIVENESS, ELASTIC PROPERTIES, FILMS, FLOW, FUEL CONSUMPTION, LUBRICATION, REPRINTS, SHEAR PROPERTIES, THICKNESS, VISCOSITY, ADDITIVES, POLYMERS, PERFORMANCE(ENGINEERING), TEST AND EVALUATION

Subject Categories : Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE