Abstract
Vibrations of varying frequency and amplitude are used in many technological areas to control and reduce friction. In this study we report the results of systematic high-precision measurements of the static and sliding friction under the influence of ultrasonic oscillations. We investigate the effect of ultrasonic oscillations for in-plane and out-of-plane oscillations in the completely relevant interval of oscillation amplitudes and sliding velocities and for various material pairings. The experimental results are interpreted on the basis of both macroscopic and microscopic models. There are two main effects which are of interest for tribological applications. Firstly, the frictional force typically decreases with increasing oscillation amplitude, with an oscillation amplitude of about 0.1 μm typically being sufficient for a significant decrease of frictional force. Secondly, the decrease of force is larger at smaller sliding velocities; therefore, at sufficiently large oscillation amplitudes, the frictional force always increases with sliding velocity. This effect can be used to suppress frictionally induced vibrations.
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The authors acknowledge the financial support of the DFG and ESF within the framework of project ACOF (Active Control of Friction).
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Teidelt, E., Starcevic, J. & Popov, V.L. Influence of Ultrasonic Oscillation on Static and Sliding Friction. Tribol Lett 48, 51–62 (2012). https://doi.org/10.1007/s11249-012-9937-4
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DOI: https://doi.org/10.1007/s11249-012-9937-4