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http://dx.doi.org/10.9725/kstle.2009.25.4.217

A Study on Friction Behavior of Textured Surface in Unlubricated State  

Oh, Seok-Ju (School of Mechanical, Aerospace & Systems Engineering, KAIST)
Kim, Sung-Gi (School of Mechanical, Aerospace & Systems Engineering, KAIST)
Kim, Kyung-Woong (Doosan Infracore Co., Ltd)
Publication Information
Tribology and Lubricants / v.25, no.4, 2009 , pp. 217-224 More about this Journal
Abstract
In this study, friction tests were carried out in order to investigate the friction behavior of textured surface in unlubricated state using ball-on-disk type apparatus. Test specimens were SUJ2 bearing steel ball and SM45C steel disk. Square arrays of circular micro-dimples were created on the surface of disk specimen by Nd:YAG Laser. Friction tests were performed for the disk specimen with various micro-dimple parameters and was also conducted for the variation of normal loads and relative velocities. The results showed that fiction coefficient of textured surface was lower than that of non-textured surface and the deeper depth of micro-dimple was, the lower friction coefficient obtained at the same diameter of micro-dimple in unlubricated state. Area density of micro-dimple had an effect on the friction coefficient. It was also found that friction coefficient generally decreased with the increase of normal load and relative velocity.
Keywords
friction coefficient; unlubricated state; micro-dimple; ball-on-disk type apparatus;
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