Elastohydrodynamic Friction Behavior of Polyalphaolefin Blends

LaFountain, A.; Johnston, G. J.; Spikes, H. A.

doi:10.1016/s0167-8922(98)80102-8

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…Methods for estimation of PVC of lubricating oils can be divided into three broad categories: (a) from pressure versus viscosity data, − (b) from film thickness data, ,,,− and (c) from physical property data ,,− of the oils. A detailed description of these methods has been reviewed recently .…”

Section: Resultsmentioning

confidence: 99%

“…Second, the PVC of the reference fluid (α r ) must have been determined independently from pressure versus viscosity data. When these two conditions are met, eq can be simplified and used to estimate the PVC of the test fluid from its film thickness ( h t ) and that of a reference fluid ( h r ) of known PVC (α r ) as follows: ,,,− …”

Section: Resultsmentioning

confidence: 99%

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Elastohydrodynamic Properties of Biobased Heat-Bodied Oils

Biresaw

Sharma

Bantchev

et al. 2014

Ind. Eng. Chem. Res.

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Heat-bodied oils were prepared by thermal treatment of soybean oil under inert atmosphere. Different viscosity grades of heat-bodied oils synthesized by varying the reaction time were investigated for various properties including viscosity, viscosity index, elastohydrodynamic film thickness, and pressure–viscosity coefficient. Heat-bodied oils displayed elastohydrodynamic film thickness characteristics typical of lubricating oils. The film thickness of heat-bodied oils increased with increasing entrainment speed and viscosity, decreased with increasing temperature, and was unchanged with varying load. Pressure–viscosity coefficients of heat-bodied oils were estimated from film thickness as well as from physical property data. The pressure–viscosity coefficient values of heat-bodied oils increased with increasing viscosity and decreasing temperature and were in the range displayed by such oils as polyol esters, poly-α-olefins, and petroleum-based base oils. Heat-bodied oils provide access to a wide viscosity range of biobased oils not attainable with vegetable oils, without serious negative impact on critical lubricant properties such as viscosity index, film thickness, and pressure–viscosity coefficient.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Elastohydrodynamic Properties of Biobased Heat-Bodied Oils

Biresaw

Sharma

Bantchev

et al. 2014

Ind. Eng. Chem. Res.

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“…The pressure viscosity coefficient α is used for the calculation of lubricant film thickness. A study has postulated that whatever fundamental molecular properties govern the dynamic viscosity also causes proportional change in pressure viscosity coefficient [42].…”

Section: Discussionmentioning

confidence: 99%

Ring-Shaped Surface Microstructures for Improved Lubrication Performance of Joint Prostheses

et al. 2020

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The microstructuring of surfaces is a highly researched field that is aimed at enhancing the tribological behavior of sliding surfaces such as artificial joints, which are subject to wear. Lubrication of the joint interface plays a key role in the wear process, although the mechanisms of lubrication are quite complex. In order to improve the lubrication, the surfaces of the articulating components can be modified by pulsed femtosecond-laser microstructuring. Through microstructuring, the apparent dynamic viscosity of the synovial fluid between the artificial joint can be increased due to its non-Newtonian properties. This may lead to better hydrodynamic lubrication and, therefore, reduced particle abrasion. Femtosecond laser-induced microstructures were investigated in a modified rheometer setup featuring a reduced gap size in order to reproduce and measure the interface between fluid and implant surface more accurately. As a test fluid, a synovial fluid substitute was used. The study has shown that an increase in the viscosity of the synovial fluid substitute can be achieved by microstructuring. Compared to a smooth implant surface, the apparent viscosity of the synovial fluid substitute increased by over 30% when ring-shaped microstructures of 100 µm diameter with an aspect ratio of 0.66 were implemented.

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“…As a result, low traction is preferable in hydraulic fluids [12][13][14] to decrease shearing forces and high traction is preferable in continuously variable transmissions fluids to avoid slippage while minimizing contact friction for energy efficiency [15][16][17]. Good traction characteristics in a lubricants are essential to achieving a balance between film thickness and resistance to shear to ensure both wear protection and energy efficiency [18].…”

Section: Introductionmentioning

confidence: 99%