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Comment on “History, Origins and Prediction of Elastohydrodynamic Friction” by Spikes and Jie

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Abstract

Progress in the classical field of EHL has for decades been paralyzed by the assumption that shear thinning should be indistinguishable from the shear dependence of the viscosity of a liquid heated by viscous dissipation and that the parameters of this simple shear dependence can be obtained from the shape of a friction curve. In the last few years, by abandoning this assumption and employing real viscosity measured with viscometers, there has been revolutionary progress in predicting film thickness and friction. Now, Spikes and Jie conclude that the previous assumption has as much merit as the use of viscosity measured in viscometers. This suggestion may be popular among those who wish to ignore viscometer measurements in favor of extracting properties from friction curves. However, within the subject article, there are numerous misstatements of fact and misrepresentations by omission, and the recent progress using real viscosity is not acknowledged. The debate has degenerated into a friction curve fitting competition which is not helpful. The great progress of the last few years would not have been possible using the concepts and methods espoused in this article.

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Author information

Authors and Affiliations

  1. Center for High-Pressure Rheology, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0405, USA

    Scott Bair

  2. LaMCoS UMR5259, Université de Lyon, INSA-Lyon, CNRS, 69621, Villeurbanne, France

    Philippe Vergne

  3. Department of Mechanical Engineering, National Institute of Technology, Kurukshetra, Haryana, 136119, India

    Punit Kumar

  4. Institut fuer Maschinenkonstruktion und Tribologie, Leibniz Universitaet Hannover, Postfach 6009, 30060, Hannover, Germany

    Gerhard Poll

  5. Faculty of Mechanical Engineering, Institute of Machine and Industrial Design, Brno University of Technology, 61669, Brno, Czech Republic

    Ivan Krupka & Martin Hartl

  6. Department of Industrial and Mechanical Engineering, Lebanese American University, Byblos, Lebanon

    Wassim Habchi

  7. Division of Machine Elements, Department of Engineering Science and Mathematics, Luleå University of Technology, 97187, Luleå, Sweden

    Roland Larsson

Authors
  1. Scott Bair
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  2. Philippe Vergne
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  3. Punit Kumar
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  4. Gerhard Poll
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  5. Ivan Krupka
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  6. Martin Hartl
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  7. Wassim Habchi
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  8. Roland Larsson
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Correspondence to Scott Bair.

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Bair, S., Vergne, P., Kumar, P. et al. Comment on “History, Origins and Prediction of Elastohydrodynamic Friction” by Spikes and Jie. Tribol Lett 58, 16 (2015). https://doi.org/10.1007/s11249-015-0481-x

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