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Title of Journal: Tribol Lett

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Abbravation: Tribology Letters

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Springer US

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DOI

10.1007/bf02763483

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ISSN

1573-2711

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A Film Thickness Correction Formula for DoubleNew

Authors: W Habchi S Bair F Qureshi M Covitch
Publish Date: 2012/12/02
Volume: 50, Issue: 1, Pages: 59-66
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Abstract

Lubricants which contain a polymeric thickener will often display a second Newtonian plateau in measured flow curves Like other manifestations of sheardependent viscosity this shear response will lead to an inaccurate prediction when the classical filmthickness formulas are employed A correction formula has been developed from numerical experiments for a range of parameters of the doubleNewtonian modified Carreau equation The parameters of this shearthinning model were selected from measurements for real lubricants obtained in Couette viscometers and a capillary viscometer In addition a full EHL film thickness formula has been derived from the same numerical experiments The correction formula and the full formula were successfully validated using published film thickness data and published viscosity data for an EHL reference liquid a polymer solution Clearly viscometer measurements of sheardependent viscosity which contain the inflection leading to the second Newtonian are essential for a filmthickness calculation when a highmolecularweight component of the lubricant is present

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  2. In Situ NbC Particulate-Reinforced Iron Matrix Composite: Microstructure and Abrasive Wear Characteristics
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