Abstract
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
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 language | English |
|---|---|
| Article number | 51 |
| Number of pages | 13 |
| Journal | Tribology Letters |
| Volume | 66 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 14 Feb 2018 |
| Externally published | Yes |
Bibliographical note
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were madeKeywords
- Anisotropically surface texturing
- Directional effect
- Ultrafast laser surface texturing
- Reciprocating sliding