Coupled couple stress and surface roughness effects on elasto-hydrodynamic contact

Nabhani, Mohamed; Khlifi, Mohamed El; Gbehe, Ory Serge Tanguy; Bou‐Saïd, Benyebka

doi:10.1002/ls.1246

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…They are obtained for different values of the elastic thin layer thickness d (compliance coefficient C s ) such as titanium alloy material. With the aim to validate the present computer program, both load capacity W * and friction coefficient C f are given in Tables I and II to compare with Nabhani et al (2014) in the case of deformable bearing for different given values of couple stress parameter l *. In addition, the dimensionless load capacity W * of infinitely wide slider-bearing is displayed in Table III for comparison with Lin et al (2009) and Nabhani and El Khlifi (2015) for different given values of Hartmann number M in the case of Newtonian lubricant ( l * = 0).…”

Section: Resultsmentioning

confidence: 99%

Effect of non-Newtonian magneto-elastohydrodynamic on performance characteristics of slider-bearings

Mouda

Nabhani

Khlifi

2019

ILT

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Purpose This study aims to examine the magneto-elastohydrodynamic effect on finite-width slider-bearings lubrication using a non-Newtonian lubricant. Design/methodology/approach Based on the magneto-hydrodynamic (MHD) theory and Stokes micro-continuum mechanics, the modified two-dimensional Reynolds equation including bearing deformation was derived. Findings It is found that the bearing deformation diminishes the load-capacity and increases the friction coefficient in comparison with the rigid case. However, the non-Newtonian effect increases load-capacity but decreases the friction coefficient. Moreover, the use of a transverse magnetic field increases both the friction coefficient and load capacity. Originality/value This study combines for the first time MHD and elastic deformation effects on finite-width slider-bearings using a non-Newtonian lubricant.

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Section: Resultsmentioning

confidence: 99%

Effect of non-Newtonian magneto-elastohydrodynamic on performance characteristics of slider-bearings

Mouda

Nabhani

Khlifi

2019

ILT

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“…Considering couple stress effect of journal with a smooth surface, the modified Reynolds equations of hydrodynamic lubrication [26] was given as:…”

Section: Average Reynolds Equation Of Couple Stress Fluidmentioning

confidence: 99%

“…Moreover, the couple stress parameter decreased obviously as the viscosity-pressure effect was considered. Based on Christensen stochastic theory, Nabhani M, 26 Naduvinamani 27 and Hanumagowda 28 derived the Reynolds equation of stochastic MHD couple stress. Transverse roughness supported larger dynamic stiffness, carrying capacity, and damping coefficients than smooth surfaces, while longitudinal roughness had the opposite effects.…”

Section: Introductionmentioning

confidence: 99%

Theoretical research of couple stress effect and surface roughness on lubrication regimes transition of misaligned hydrodynamic journal

Zheng

Zhu

Fan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The purpose of this paper was to investigate the combined effects of couple stress and surface roughness on lubrication performance and regime transition of misaligned hydrodynamic journals. New lubrication models considering misalignment angle, couple stress, and surface roughness were established. Under the multi-coupled factors, Stribeck curves were exploited to reveal the lubrication regimes of journals. Following Greenwood’s aspect contact theory, force relational equations among external load, asperity support capacity, and oil film bearing capacity have been further discussed. Results showed that the growth of the minimum film thickness, the maximum film pressure, and friction coefficient versus couple stress parameters trended to be opposite to those versus misalignment angle. The speed of the lubrication regime transition and the minimum friction coefficient increased with the enlargement of the misalignment angle but decreased as the couple stress parameter increased. Higher couple stress parameters resulted in an increment of the safety speed of the journal and were conducive to maintaining the hydrodynamic lubrication regime of the misaligned bearing at low speed, which is applicable to such misaligned journal bearings in practical engineering.

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“…The load-carrying capacity and the coefficient of friction were enhanced due to the existence of such protrusions. The combined effect of surface roughness and couple stress fluid on the elastohydrodynamic performance of journal bearing was studied by Chiang et al [22] and Nabhani et al [23]. It was observed that the interaction between couple stress, surface roughness and elastic deformation effects is significant.…”

Section: Introductionmentioning

confidence: 99%

Effect of microridges on the performance of three-lobe journal bearing considering cavitation and lubricant compressibility

Abass,

Mahdi

2023

tribomat

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This study presents a numerical study of the effect of microridges on the performance of the three-lobe journal bearing considering lubricant compressibility and cavitation effects. A mathematical model based on the Reynolds equation that has been modified to take into account the effects of lubricant compressibility and cavitation has been proposed to achieve the primary goal of this work. Lubricant compressibility is considered by using lubricating oils with different bulk moduli while Elord's algorithm was used to consider the effect of cavitation. The governing equations for finite length journal bearing lubricated with Newtonian oil in laminar flow and isothermal condition are numerically discretised using the finite difference method and solved by using a suitable prepared computer program. The performance of the rough and smooth bearings was compared for plain and three-lobe journal bearings. The numerical model was demonstrated by comparing the pressure distribution for smooth and microridges three-lobe journal bearing with that published by El-Said et al. and they were found in good agreement. It was found that the pressure and the load were considerably enhanced and the coefficient of friction decreased by 15 % for three-lobe journal bearing with microridges in comparison with that of smooth surfaces.

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Coupled couple stress and surface roughness effects on elasto-hydrodynamic contact

Cited by 7 publications

References 25 publications

Effect of non-Newtonian magneto-elastohydrodynamic on performance characteristics of slider-bearings

Effect of non-Newtonian magneto-elastohydrodynamic on performance characteristics of slider-bearings

Theoretical research of couple stress effect and surface roughness on lubrication regimes transition of misaligned hydrodynamic journal

Effect of microridges on the performance of three-lobe journal bearing considering cavitation and lubricant compressibility

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