A novel surface texture shape for directional friction control

Ping Lu, Robert JK Wood, Mark G Gee, Ling Wang, Wilhelm Pfleging

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69 Citations (Scopus)
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An experimental study is presented to evaluate the infuence 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 beneft or antagonism of texturing. Observation of the directional friction efect of the anisotropic textures indicated
that the converging shapes are benefcial for friction reduction, and the dimpled specimens have a lower friction coefcient
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 efective converging wedge
action to generate hydrodynamic pressure and contribute to the overall directional friction efects
Original languageEnglish
Article number51
Number of pages13
JournalTribology Letters
Issue number1
Publication statusPublished - 14 Feb 2018
Externally publishedYes

Bibliographical note

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  • Anisotropically surface texturing
  • Directional effect
  • Ultrafast laser surface texturing
  • Reciprocating sliding


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