Results 211 to 220 of about 3,458,134 (243)

Experimental Investigation of Lubrication Failure of Polyalphaolefin Oil Film at High Slide/Roll Ratios

Tribology Letters, 2011
Lubrication failure of polyalphaolefin (PAO) oil film at high slide/roll ratios of more than 1.9 has been experimentally investigated based on a ball-on-disc configuration. The central film thickness and the oil pool shape in the contact were determined by optical interferometry and fluorescence microscopy, respectively, and the traction coefficient ...
Xinchun Lu, Shuhai Liu, Dan Guo
exaly   +2 more sources

Effects of Slide/Roll Ratio on the Behaviours of Grease Reservoir and Film Thickness of Point Contact

Tribology Letters, 2014
The film formation mechanism of lithium complex grease under starved condition was proposed based on the analysis of the relationship between grease reservoir and the finger-shaped lubricant along the rolling track using a laboratory built ball-on-disc test rig.
Lu Huang, Dan Guo, Shizhu Wen
exaly   +2 more sources

Solving coupled boundary slip and heat transfer EHL problem under large slide–roll ratio conditions

Tribology International, 2019
Abstract Furnishing boundary slip at one of the liquid/solid interfaces in a bearing contact has been proven able to reduce bearing friction in a few recent studies conducted under mild running conditions where thermal effect is insignificant. However, if the concept is applied to practical conditions, how the slip affects temperature rise and its ...
P L Wong
exaly   +2 more sources

The influence of base oil polarity and slide–roll ratio on additive-derived reaction layer formation

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2011
Functional additives, particularly extreme-pressure and antiwear additives, in formulated oil will compete to adsorb and form a protective layer in tribological contacts. The thickness of the layer is determined by the equilibrium between the formation and removal processes. In this article, the interactions between additives and base oil molecules and
Roland Larsson, Agnieszka Maria Tomala
exaly   +3 more sources

Effects of Thermal Properties of Contact Materials and Slide-Roll Ratio in Elastohydrodynamic Lubrication

Journal of Tribology, 2021
Abstract The effects of thermal conductivity, heat capacity, thermal inertia, and slide-roll ratio (SRR) on point elastohydrodynamic lubrication (EHL) are discussed with engineering ceramics and steel by a non-Newtonian thermal EHL analysis.
Motohiro Kaneta, Kenji Matsuda, Hiroshi Nishikawa   +2 more
openaire   +1 more source

Film Thicknesses in Elastohydrodynamic Lubrication at High Slide/Roll Ratios

Proceedings of the Institution of Mechanical Engineers, Conference Proceedings, 1968
The thicknesses of the films of lubricant formed between two steel discs in rolling and sliding contact have been estimated from measurements of the electrical capacity between the two discs. As the slide/roll ratio increased above a certain level the experimental values of the film thickness became progressively greater than the values predicted by ...
A. Dyson, A. R. Wilson
openaire   +1 more source

Effect of the sliding-rolling ratio on the force chain properties of granular flow lubrication interfaces

Industrial Lubrication and Tribology, 2023
Purpose To further understand the granular flow lubrication mechanism in metal contact pairs, the effect of sliding-rolling ratio on the force chain properties was investigated. Design/methodology/approach The parallel inter-plate ...
openaire   +1 more source

Effects of slide-roll ratio and lubricant properties on elastohydrodynamic lubrication film thickness and traction

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2001
With tribology research aimed at decreasing energy consumption, two factors are inherently in focus: lubricant film thickness and traction. These factors are effectively decoupled and depend on lubricant properties which are sometimes contradictory-favourable for one factor and disadvantageous for the other.
J Lord, R Larsson
openaire   +1 more source

A Simple Calculation of EHL Traction at Small Slide/Roll Ratio Including Roller Elasticity

World Tribology Congress III, Volume 2, 2005
Elastohydrodynamic point contact traction may be predicted accurately for the small slide-to-roll ratio, Σ, isothermal case by first calculating the shear response of the liquid in a parallel gap with a hemispherical pressure distribution and then correcting Σ for the elastic roller compliance.
Scott Bair, Michael Kotzalas
openaire   +1 more source

On the Theory of Thermal Elastohydrodynamic Lubrication at High Slide-Roll Ratios—Line Contact Solution

Journal of Tribology, 2000
Complete numerical solutions are obtained for the steady-state line contact thermal elastohydrodynamic lubrication (TEHL) problems. The contact surfaces are arranged to run in opposite directions. The slide-roll ratios are allowed to be as high as infinity.
Peiran Yang, Shiyue Qu, Qiuying Chang, Feng Guo   +3 more
openaire   +1 more source