Lubricant limiting shear stress effect on EHD film thicknessA Grubin-like EHD inlet analysis utilizing a non-linear viscous fluid model with a limiting shear stress is reported. The shear rheological equation requirs only a low shear stress viscosity and the limiting shear stress both functions of pressure. Values employed for these properties are taken from measurements on typical lubricants. Reductions of EHD film thickness are found to be up to 40 percent compared with the standard Grubin prediction for typical operating conditions. Slide-roll ratio, limiting shear stress dependence on pressure, and atmospheric pressure value of limiting shear stress are new variables required to determine film thickness with the first two being more important than the last. The EHD film thickness is reduced by increasing slide-roll ratio and/or decreasing the pressure dependence of the limiting shear stress.
Document ID
19800030577
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gecim, B. (Georgia Inst. of Tech. Atlanta, GA, United States)
Winer, W. O. (Georgia Institute of Technology Atlanta, Ga., United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1979
Subject Category
Mechanical Engineering
Report/Patent Number
ASME PAPER 79-LUB-12
Meeting Information
Meeting: Lubrication Conference
Location: Dayton, OH
Start Date: October 16, 1979
End Date: October 18, 1979
Sponsors: American Society of Mechanical Engineers and American Society of Lubrication Engineers