Ordinary shear-thinning affects EHL film thickness by reducing the central thickness from the theoretical Newtonian value 1 and ordinary shear-thinning affects traction in point contacts by shifting the logarithmic traction gradient to higher rates 2 in a manner indistinguishable from a reduction in pressure dependence of low shear viscosity at high pressure 2. The models selected by the authors for shear-thinning are not recognizable as ordinary shear-thinning. The authors’ Eq. (10) was Eyring’s sinh law model for thixotropy 3. Thixotropy should not be an issue here since the traction fluid is not known to contain wax and in any event the waxy structures studied by Eyring were quite weak with approximately 3. Eyring made very clear his opinion that the sinh law, Eq. (10), is not an accurate description of shear-thinning 4. The authors’ Eq. (11) is not constitutive as it...
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April 2005
Article
Discussion: “Modeling of Film Thickness and Traction in a Variable Ratio Traction Drive Rig,” (Sharif, K. J., Evans, H. P., Snidle, R. W., and Newall, J. P., 2004, ASME J. of Tribology, 126(1), pp. 92–104)
Scott Bair,
Scott Bair
George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405.
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Philippe Vergne
Philippe Vergne
Laboratoire de Me´canique des Contacts et des Solides, UMR CNRS/INSA de Lyon 5514, Villeurbanne, France.
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Scott Bair
George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405.
Philippe Vergne
Laboratoire de Me´canique des Contacts et des Solides, UMR CNRS/INSA de Lyon 5514, Villeurbanne, France.
J. Tribol. Apr 2005, 127(2): 458 (1 pages)
Published Online: April 7, 2005
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Online:
April 7, 2005
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Bair, S., and Vergne, P. (April 7, 2005). "Discussion: “Modeling of Film Thickness and Traction in a Variable Ratio Traction Drive Rig,” (Sharif, K. J., Evans, H. P., Snidle, R. W., and Newall, J. P., 2004, ASME J. of Tribology, 126(1), pp. 92–104) ." ASME. J. Tribol. April 2005; 127(2): 458. https://doi.org/10.1115/1.1843164
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