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Friction of Textured Surfaces in EHL and Mixed Lubrication: Effect of the Groove Topography

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Abstract

The influence of the groove topography, especially their top width and their orientation upon the friction in elastohydrodynamic lubrication (EHL) and mixed lubrication regimes was characterized by means of Stribeck curves. Friction levels with groove surfaces were linked to optical measurements of the film thickness distribution inside the contact and compared with data for a smooth surface. In EHL, results indicate no overall friction modification. Nonetheless in this regime, the local film thickness becomes, under a critical top width, lower than the smooth surface leading to a shift of the EHL/mixed regime transition. In mixed regime, the friction is much higher than the smooth surface and narrower tops cause more severe friction than wider one. If the orientation of the grooves does not modify significantly the friction, transverse grooves (perpendicular to the entrainment direction) enable the formation of local dimples in mixed regime, which locally increase the lubrication efficiency.

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Abbreviations

a :

Contact radius

\(A_\%\) :

Percentage of asperity contacts

d :

Groove depth

E :

Young modulus

h :

Film thickness

\(h_{\rm c}\) :

Central film thickness

p :

Pressure

R :

Curvature radius

\(S_q\) :

Surface RMS roughness parameter

T :

Temperature

\(u_1\) :

Disk speed

\(u_2\) :

Ball speed

\(u_{\rm e}\) :

Entrainment speed \(=(u_1+u_2)/2\)

\(u_{\rm s}\) :

Sliding speed \(=u_1-u_2\)

\(\alpha\) :

Piezo-viscosity

\(\eta\) :

Dynamic viscosity

\(\eta _{0/P}\) :

Under-pressure viscosity at low shear stress

\(\eta _{\infty /P}\) :

Under-pressure viscosity at high shear stress

\(\dot{\gamma }\) :

Shear rate

\(\lambda\) :

Groove wavelength

\(\mu\) :

Friction coefficient

\(\nu\) :

Poisson ratio

\(\tau\) :

Shear stress

\(\varSigma\) :

Sliding/rolling ratio \(=u_{\rm s}/u_{\rm e}\)

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Acknowledgments

The authors acknowledge IREIS Company (France) for active collaboration and surface texture manufacturing.

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Authors and Affiliations

  1. Ecole Centrale de Lyon, LTDS UMR 5513, 36 avenue Guy de Collongue, 69134, Ecully Cedex, France

    Thomas Touche, Juliette Cayer-Barrioz & Denis Mazuyer

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  1. Thomas Touche
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  2. Juliette Cayer-Barrioz
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  3. Denis Mazuyer
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Correspondence to Denis Mazuyer.

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Touche, T., Cayer-Barrioz, J. & Mazuyer, D. Friction of Textured Surfaces in EHL and Mixed Lubrication: Effect of the Groove Topography. Tribol Lett 63, 25 (2016). https://doi.org/10.1007/s11249-016-0713-8

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