2022
DOI: 10.3390/lubricants10090221
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A Traction (Friction) Curve Is Not a Flow Curve

Abstract: With the uncertainty regarding the global energy future, the ability to lubricate concentrated contacts with sufficiently thick liquid films while minimizing friction is of extreme importance. The assumptions of classical elastohydrodynamic lubrication have remained unchanged since the early days. It has not been possible to test many of these assumptions without the measurement of the viscosity at elastohydrodynamic lubrication (EHL) pressures, and viscometer measurements have been ignored. One of these assum… Show more

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Cited by 8 publications
(3 citation statements)
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“…We agree with the commentator that a test rig is not a rheometer [2], as the measured friction is only an integral response of extremely different states in the contact. This problem is pointed out several times in our paper.…”
Section: Validation Of the Assumed Flow Behaviour With Tribometerssupporting
confidence: 87%
“…We agree with the commentator that a test rig is not a rheometer [2], as the measured friction is only an integral response of extremely different states in the contact. This problem is pointed out several times in our paper.…”
Section: Validation Of the Assumed Flow Behaviour With Tribometerssupporting
confidence: 87%
“…Thermophysical properties of lubricants at extreme pressures are highly important for the design of processes in mechanical engineering. 1 Especially the density and the transport properties determine the performance of the lubricant in the lubrication gap. The pressures in tribological systems with small contact areas are often higher than 1,000 MPa.…”
Section: ■ Introductionmentioning
confidence: 99%
“…However, Bair reported different properties of LVI260, especially the viscosity and shear modulus [7]. Furthermore, Bair et al [13] argued that the viscosity data should be fitted to the rheological flow curve (viscosity vs. shear rate) to predict both traction and film thickness accurately and not to the traction curve. Furthermore, the basics and assumptions behind these shear thinning models are reviewed by Spike and Jie [14].…”
Section: Introductionmentioning
confidence: 99%