Elastohydrodynamic Analysis Using a Power Law Pressure-viscosity Relation
National Aeronautics and Space Administration, 1973 - Coatings - 27 pages
An isothermal elastohydrodynamic (EHD) inlet analysis of the Grubin type which considers a power law pressure-viscosity relation and a finite pressure at the inlet edge of the Hertzian contact zone was performed. Comparisons made with published X-ray EHD film thickness data for a synthetic paraffinic oil and when conventional EHD theory showed that the present theory exhibits a slightly stronger film thickness load dependence than do previous isothermal EHD theories but far less than that exhibited by the measured data.
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absolute viscosity ambient pressure Cheng's theory ref Chu and Cameron cm Power law COMPARISON OF PREDICTED contact stress data from ref defined in eq Disk 1m tem1erature Disk speed disk temperatures EHD film thickness equation 16 exponential pressure-viscosity model exponential pressure-viscosity relation film thickness formula Grubin type h film Hertzian contact zone hydrodynamic inlet analysis inlet edge inlet pressure Kannel ref Kp)n LAW PRESSURE-VISCOSITY RELATION Lewis Research Center load dependence lubricant lubricant's viscosity Maximum Hertz stress Maximum stress minimum film thickness N/m psi newtons per square paraffinic mineral oils power law pressure-viscosity Power law theory PREDICTED MINIMUM FILM present EHD Pressure above ambient pressure-viscosity coefficient rheological square meter 150 straight exponential pressure-viscosity straight paraffinic mineral surface speeds synthetic paraffinic oil theory X-ray data THICKNESS WITH X-RAY U.S. Army U.S. customary units units Minimum film value of film variation with pressure viscosity relation X-ray test Zaretsky