Film Thickness in Starved EHL Point Contacts

Chevalier, Florian; Lubrecht, Antonius; Cann, P. M.; Colin, François; Dalmaz, G.

doi:10.1115/1.2834175

Cited by 178 publications

(126 citation statements)

References 18 publications

Supporting

Mentioning

118

Contrasting

Order By: Relevance

“…The principles of this approach were first implemented into a generalised computer algorithm by Elrod and Adams [14] by use of a switch function to determine the approximate location of cavitation boundary during the solution process. This model has been extensively employed in the analysis of lubrication problems and it has been successfully validated by comparison with experimental evidences for both dynamic transient hydrodynamics and elastohydrodynamic lubrication problems [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Transient effects in lubricated textured bearings

Medina

Fowell

Vlădescu

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

The aim of this paper is to study transient phenomena in hydrodynamic textured bearings. Both convergent and convergent-divergent reciprocating textured bearings are considered. A massconserving formulation of the Reynolds equation recently proposed by some of the authors and used to capture cavitation in steady-state lubricated contacts has been implemented to study transient effects in lubricated textured bearings. It is shown that the proposed solver is capable of capturing the frictional response of bearings characterised by various geometries and loading conditions in both steady-state and transient configurations.Depending on the boundary conditions governing the problems under investigation, changes in load support or film thickness variations are correctly predicted, demonstrating that the methodology developed in this paper is suitable to provide an efficient tool for the design and optimisation of textured bearings. A qualitative comparison with preliminary experimental data obtained using an apparatus developed to study reciprocating textured surfaces is performed, showing that the characteristic transient behaviour of such surfaces in different loading regimes can be correctly captured using the proposed numerical implementation. Current limitations of the proposed methodology and possible extensions of the technique to study elasto-hydrodynamic and mixed lubrication regimes are also discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Transient effects in lubricated textured bearings

Medina

Fowell

Vlădescu

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…Further, Chiu [13] and Chevalier et al [14], followed by Damiens et al [15], have theoretically studied starved lubrication. These theoretical studies were based on the work of Jakobsson and Floberg [16] and Olsson [17], who introduced the concept of "fractional film content" and derived continuity relations.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Surface Texturing on the Film Thickness in Starved Lubricated Parallel Sliding Contacts

Bijani¹,

Deladi²,

Rooij

et al. 2018

Lubricants

View full text Add to dashboard Cite

Abstract:In industrial applications, a starved lubrication condition may occur, leading to a reduction in film thickness; by modifying the surface geometry, the tribological performance of the contact is enhanced. In this paper, the influence of surface texturing as a method for reducing the friction on the film thickness in parallel sliding surfaces for starved lubricated contacts is investigated. The results in this study have shown that surface texturing can improve film formation for starved lubricated contacts and, respectively, the load carrying capacity. The effect of starvation on several texturing patterns with several texturing properties was investigated and the film thickness for these conditions was studied. With the numerical algorithm developed and taking cavitation into consideration, the effect of shape, depth, size, and texture pitch on the film thickness was studied.

show abstract

“…Based on the results of numerical solutions, formulas have been developed to predict, e.g. the film thickness for fully flooded conditions [1][2][3][4] as well as the reduction due to starvation [5,6]. Generalized traction curves have been derived [7] and engineering models established, for the prediction of surface roughness deformation based on harmonic waviness [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Boundary Layer Behaviour in Circular EHL Contacts in the Elastic-Piezoviscous Regime

2014

Self Cite

View full text Add to dashboard Cite

The solution of elastohydrodynamically lubricated contacts at high loads and/or low speeds can be described as a Hertzian pressure with inlet and outlet boundary layers: zones where significant pressure flow occurs. For the soft lubrication regime (elastic-isoviscous), a self-similar solution exists in the boundary layers satisfying localized equations. In this paper, the boundary layer behaviour in the elastic-piezoviscous regime is investigated. The lengthscale of the boundary layers and the scaling of pressure and film thickness are expressed in nondimensional parameters. The boundary layer width scales as 1= ffiffiffiffi ffi M p (equivalent to " k 3=8 ), the maximum pressure difference relative to the Hertzian solution as 1= ffiffiffiffi ffi M 3 p (equivalent to " k 1=4 ) and the film thickness as 1= ffiffiffiffi ffi M 16 p (equivalent to " k 3=64 ) with M the Moes non-dimensional load and " k a dimensionless speed parameter. The Moes dimensionless lubricant parameter L was fixed. These scalings differ from the isoviscous-elastic (soft lubrication) regime. With increasing load (decreasing speed), the solution exhibits an increasing degree of rotational symmetry. The pressure varies less than 10 % over an angle less than 45 degrees from the lubricant entrainment direction. The results provide additional fundamental understanding of the nature of elastohydrodynamic lubrication and give physical rationale to the finding of roughness deformation depending on the ''inlet length''. The findings may contribute to more efficient numerical solutions and to improved semi-analytical prediction methods for engineering based on physically correct asymptotic behaviour.

show abstract

Film Thickness in Starved EHL Point Contacts

Cited by 178 publications

References 18 publications

Transient effects in lubricated textured bearings

Transient effects in lubricated textured bearings

The Influence of Surface Texturing on the Film Thickness in Starved Lubricated Parallel Sliding Contacts

Boundary Layer Behaviour in Circular EHL Contacts in the Elastic-Piezoviscous Regime

Contact Info

Product

Resources

About