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A novel surface texture shape for directional friction control

A novel surface texture shape for directional friction control
A novel surface texture shape for directional friction control
An experimental study is presented to evaluate the influence of anisotropically shaped textures on the behaviour of sliding friction and sensitivity to sliding direction. The plate samples were textured with triangular sloped dimples using an ultrafast laser surface texturing technique. Reciprocating cylinder-on-plate tests were conducted with steel sliding pairs using mineral base oil as a lubricant to compare the tribological performance of reference non-textured specimen and dimpled samples. The dimples were designed with varying converging angles in the transverse y-z plane and top-view x-y plane. In this study, no dimple was fully covered in the contact area since the dimples size is much larger than the Hertzian line contact width. Stribeck style dynamic friction curves across boundary, mixed and hydrodynamic lubrication regimes were used to determine the benefit or antagonism of texturing. Observation of the directional friction effect of the anisotropic textures indicated that the converging shapes are beneficial for friction reduction, and the dimpled specimens have a lower friction coefficient particular under prevailing boundary lubrication conditions. It was also found that the real contact length variation rate is a major factor controlling the local friction response. The sloped bottoms of the textures produce effective converging wedge action to generate hydrodynamic pressure and contributes to the overall directional friction effects.
anisotropically surface texturing, directional effect, ultrafast laser surface texturing, reciprocating sliding
1023-8883
Lu, Ping
ba21c28d-7f59-477f-9ae5-898d84892237
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Gee, Mark
5b1eda51-2c8b-47c8-b294-70c32edcae20
Wang, Ling
c50767b1-7474-4094-9b06-4fe64e9fe362
Pfleging, Wilhelm
bd9807e5-3164-4997-a78e-92ddc8497194
Lu, Ping
ba21c28d-7f59-477f-9ae5-898d84892237
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Gee, Mark
5b1eda51-2c8b-47c8-b294-70c32edcae20
Wang, Ling
c50767b1-7474-4094-9b06-4fe64e9fe362
Pfleging, Wilhelm
bd9807e5-3164-4997-a78e-92ddc8497194

Lu, Ping, Wood, Robert, Gee, Mark, Wang, Ling and Pfleging, Wilhelm (2018) A novel surface texture shape for directional friction control. Tribology letters. (In Press)

Record type: Article

Abstract

An experimental study is presented to evaluate the influence of anisotropically shaped textures on the behaviour of sliding friction and sensitivity to sliding direction. The plate samples were textured with triangular sloped dimples using an ultrafast laser surface texturing technique. Reciprocating cylinder-on-plate tests were conducted with steel sliding pairs using mineral base oil as a lubricant to compare the tribological performance of reference non-textured specimen and dimpled samples. The dimples were designed with varying converging angles in the transverse y-z plane and top-view x-y plane. In this study, no dimple was fully covered in the contact area since the dimples size is much larger than the Hertzian line contact width. Stribeck style dynamic friction curves across boundary, mixed and hydrodynamic lubrication regimes were used to determine the benefit or antagonism of texturing. Observation of the directional friction effect of the anisotropic textures indicated that the converging shapes are beneficial for friction reduction, and the dimpled specimens have a lower friction coefficient particular under prevailing boundary lubrication conditions. It was also found that the real contact length variation rate is a major factor controlling the local friction response. The sloped bottoms of the textures produce effective converging wedge action to generate hydrodynamic pressure and contributes to the overall directional friction effects.

Text Lu-2018-TribologyLetters - Accepted Manuscript
Restricted to Repository staff only until 31 January 2019.
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More information

Accepted/In Press date: 29 January 2018
Keywords: anisotropically surface texturing, directional effect, ultrafast laser surface texturing, reciprocating sliding

Identifiers

Local EPrints ID: 417291
URI: https://eprints.soton.ac.uk/id/eprint/417291
ISSN: 1023-8883
PURE UUID: a861c014-462a-4dd6-b835-873c80ec0e15
ORCID for Robert Wood: ORCID iD orcid.org/0000-0003-0681-9239
ORCID for Ling Wang: ORCID iD orcid.org/0000-0002-2894-6784

Catalogue record

Date deposited: 29 Jan 2018 17:30
Last modified: 29 Jan 2018 17:30

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Contributors

Author: Ping Lu
Author: Robert Wood ORCID iD
Author: Mark Gee
Author: Ling Wang ORCID iD
Author: Wilhelm Pfleging

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