Details
| Original language | English |
|---|---|
| Article number | 16 |
| Number of pages | 8 |
| Journal | Tribology letters |
| Volume | 58 |
| Issue number | 1 |
| Early online date | 11 Mar 2015 |
| Publication status | Published - Apr 2015 |
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.
Keywords
- EHL friction (traction), Non-Newtonian behavior, Rheology, Thermal effects in EHL, Viscosity-pressure, Viscosity-temperature
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Tribology letters, Vol. 58, No. 1, 16, 04.2015.
Research output: Contribution to journal › Commentary in journal › Research › peer review
}
TY - JOUR
T1 - Comment on "History, Origins and Prediction of Elastohydrodynamic Friction" by Spikes and Jie
AU - Bair, Scott
AU - Vergne, Philippe
AU - Kumar, Punit
AU - Poll, Gerhard
AU - Krupka, Ivan
AU - Hartl, Martin
AU - Habchi, Wassim
AU - Larsson, Roland
PY - 2015/4
Y1 - 2015/4
N2 - 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.
AB - 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.
KW - EHL friction (traction)
KW - Non-Newtonian behavior
KW - Rheology
KW - Thermal effects in EHL
KW - Viscosity-pressure
KW - Viscosity-temperature
UR - http://www.scopus.com/inward/record.url?scp=84924767318&partnerID=8YFLogxK
U2 - 10.1007/s11249-015-0481-x
DO - 10.1007/s11249-015-0481-x
M3 - Commentary in journal
AN - SCOPUS:84924767318
VL - 58
JO - Tribology letters
JF - Tribology letters
SN - 1023-8883
IS - 1
M1 - 16
ER -