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Friction 2023, 11(2): 246-258 https://doi.org/10.1007/s40544-022-0598-5
Research Article | Open Access | Issue | Published: 02 May 2022

Tribological properties of hierarchical micro-dimples produced on a cylindrical surface by dual-frequency texturing

Show Author's Information Saood ALI,  Rendi KURNIAWAN( ),  Park Gun CHUL,  Tae Jo KO( )
School of Mechanical Engineering, Yeungnam University, Gyeongsan-si 712749, Republic of Korea
Keywords:
tribology, dual-frequency surface texturing, hierarchical surfaces, starved lubrication, three-dimensional elliptical vibration transducer
Cite this article:
ALI S, KURNIAWAN R, CHUL PG, et al. Tribological properties of hierarchical micro-dimples produced on a cylindrical surface by dual-frequency texturing. Friction, 2023, 11(2): 246-258. https://doi.org/10.1007/s40544-022-0598-5
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Abstract Full text About this article

An experimental investigation was performed for investigating the tribological performance of micro-dimple surface texture patterns on a cylindrical surface in a realistic operating environment of starved lubrication. Micro-dimples were generated by a dual-frequency surface texturing method, in which a high-frequency (16.3 kHz) three-dimensional (3D) vibration and a low-frequency (230 Hz) one-dimensional (1D) vibration were applied at the tool tip simultaneously, resulting in the generation of the hierarchical micro-dimples in a single step. Rotating cylinder-on-pin tribological tests were conducted to compare the tribological performance of the non-textured reference specimen and micro-dimple samples. The effect of surface textures generated with various shape parameters (long drop and short drop), dimension parameters (length and surface texture density), and operation parameters (load and sliding velocity) on the tribological performance was evaluated. Stribeck curves indicate that the hierarchical micro-dimples exhibit a lower coefficient of friction than the reference specimen in the high contact-pressure regions. It is also observed that variation in the length of a micro-dimple, the shape effect, is the major factor affecting the friction response of the textured surfaces. The generation of additional hydrodynamic pressure and lift effect by hierarchical structures is the main reason for the improved performance of hierarchical micro-dimple surfaces.


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About this article

Tribological properties of hierarchical micro-dimples produced on a cylindrical surface by dual-frequency texturing

Show Author's information Saood ALI, Rendi KURNIAWAN( ), Park Gun CHUL, Tae Jo KO( )
School of Mechanical Engineering, Yeungnam University, Gyeongsan-si 712749, Republic of Korea

Abstract

An experimental investigation was performed for investigating the tribological performance of micro-dimple surface texture patterns on a cylindrical surface in a realistic operating environment of starved lubrication. Micro-dimples were generated by a dual-frequency surface texturing method, in which a high-frequency (16.3 kHz) three-dimensional (3D) vibration and a low-frequency (230 Hz) one-dimensional (1D) vibration were applied at the tool tip simultaneously, resulting in the generation of the hierarchical micro-dimples in a single step. Rotating cylinder-on-pin tribological tests were conducted to compare the tribological performance of the non-textured reference specimen and micro-dimple samples. The effect of surface textures generated with various shape parameters (long drop and short drop), dimension parameters (length and surface texture density), and operation parameters (load and sliding velocity) on the tribological performance was evaluated. Stribeck curves indicate that the hierarchical micro-dimples exhibit a lower coefficient of friction than the reference specimen in the high contact-pressure regions. It is also observed that variation in the length of a micro-dimple, the shape effect, is the major factor affecting the friction response of the textured surfaces. The generation of additional hydrodynamic pressure and lift effect by hierarchical structures is the main reason for the improved performance of hierarchical micro-dimple surfaces.

Keywords: tribology, dual-frequency surface texturing, hierarchical surfaces, starved lubrication, three-dimensional elliptical vibration transducer

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Publication history

Received: 03 May 2021
Revised: 15 July 2021
Accepted: 08 January 2022
Published: 02 May 2022
Issue date: February 2023

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© The author(s) 2022.

Acknowledgements

This work is supported by the 2020 Yeungnam University research grant.

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