The Role of Fragility in Thermal Elastohydrodynamics

Temperature primarily influences thermal elastohydrodynamic lubrication (TEHL) through the temperature dependence of the viscosity of the liquid. The pressure and temperature dependences of viscosity increase rapidly as the glassy state is approached from the liquid state, a property known as fragil...

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Bibliographic Details
Published in:Tribology letters 2023-03, Vol.71 (1), p.24, Article 24
Main Authors: Bair, Scott, Habchi, Wassim
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Corrosion and Coatings
Dependence
Elastohydrodynamic lubrication
Elastohydrodynamics
Film thickness
Fragility
Friction
Glass
Line contact
Lubricants & lubrication
Materials Science
Mechanical engineering
Mineral oils
Nanotechnology
Original Paper
Physical Chemistry
Rheology
Shear viscosity
Surfaces and Interfaces
Temperature
Temperature dependence
Theoretical and Applied Mechanics
Thin Films
Tribology
Viscosity
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Summary:Temperature primarily influences thermal elastohydrodynamic lubrication (TEHL) through the temperature dependence of the viscosity of the liquid. The pressure and temperature dependences of viscosity increase rapidly as the glassy state is approached from the liquid state, a property known as fragility. The glass temperature increases with pressure and reaches to ordinary temperatures at TEHL pressures. Most TEHL analyses have ignored fragility by utilizing a viscosity correlation incapable of describing this behavior. Here, a low-viscosity, fragile oil is characterized for low-shear viscosity to 1.6 GPa and TEHL line contact simulations show, not only a substantial effect on friction, but also significant differences in minimum film thickness when fragility is not ignored, as is customary in classical TEHL. The influence on friction manifests even under moderate load and speed conditions, while that on film thickness seems to be restricted to high loads.
ISSN:1023-8883
1573-2711
DOI:10.1007/s11249-023-01696-6