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http://dx.doi.org/10.9725/kts.2021.37.1.25

Effect of Micro-grooves Manufactured via Ultrasonic Nanocrystalline Surface Modification on Sliding Friction  

Ro, Junsuek (Graduate School, Dept. of Fusion Science and Technology, Sun Moon University)
Amanov, Auezhan (Dept. of Mechanical Engineering/Fusion Science and Technology, Sun Moon University)
Publication Information
Tribology and Lubricants / v.37, no.1, 2021 , pp. 25-30 More about this Journal
Abstract
The surface texture produced via surface texturing is an important approach for controlling the tribological behavior of friction behavior of mechanical devices. The purpose of this study is to investigate the effect of grooves generated via ultrasonic nanocrystal surface modification (UNSM) technology on the tribological performance of AISI 4150 steel against stainless steel 316L. In the study, tribological tests are performed under two different regimes, namely mixed and hydrodynamic lubrication, by varying the applied normal load and reciprocating speed during the tests. According to the test results, the friction coefficient decreases as static load (10 N, 30 N, and 50 N) of UNSM technology increases in the mixed lubrication regime. Conversely, the friction coefficient increases as the static load (10 N, 30 N, and 50 N) of UNSM technology increases in the hydrodynamic lubrication regime. Hence, the results indicate that micro-grooves generate hydrodynamic pressure in the outlet, which increases the oil film thickness between the two mating surfaces. This potentially leads to a reduction in friction in the mixed lubrication regime due to the prevention of contact of asperities and debris. However, the results indicate an adverse effect in the hydrodynamic lubrication regime. In this regard, additional experiments should be performed to investigate the effect of grooves generated by UNSM technology at varying conditions on the friction behavior of AISI 4150 steel, which in turn can be controlled by the generated pressure and oil film thickness at the contact interface.
Keywords
groove; sliding friction; UNSM;
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