Accession Number:

ADA190145

Title:

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

Descriptive Note:

Corporate Author:

WISCONSIN UNIV-MADISON DEPT OF ENGINEERING MECHANICS

Personal Author(s):

Report Date:

1987-01-01

Pagination or Media Count:

20.0

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.

Subject Categories:

  • Lubricants and Hydraulic Fluids

Distribution Statement:

APPROVED FOR PUBLIC RELEASE