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Structuring of tribological active surfaces for reduction of frictional losses

: Schubert, A.; Edelmann, J.; Sylla, D.; Hackert-Oschätzchen, M.

Preprint urn:nbn:de:0011-n-1646053 (332 KByte PDF)
MD5 Fingerprint: 3313b3a8e393d2b4974182ea47acdd35
Created on: 16.6.2011

Spaan, H. ; European Society for Precision Engineering and Nanotechnology -EUSPEN-:
11th International Conference of the European Society for Precision Engineering and Nanotechnology 2011. Proceedings. Vol.2 : May 23rd - 26th 2011, Como, Italy; conference proceedings
Bedford: Euspen, 2011
ISBN: 978-0-9553082-9-1
European Society for Precision Engineering and Nanotechnology (EUSPEN International Conference) <11, 2011, Como>
Conference Paper, Electronic Publication
Fraunhofer IWU ()
tribology; friction; wear; surface; measurement; microstructuring

Surfaces in a wide range of engineering applications are subject to tribological loads. Many of these surfaces have a profound effect on the efficiency of manufacturing processes and products during service. This paper focuses on the effect of surface microstructure geometry on the friction coefficient between lubricated sliding partners. Initially, the Computational Fluid Dynamics (CFD) package COMSOL. Multiphysics was used to determine the effect of geometry parameters of semispherical cavities on hydrodynamic pressure. The simulations showed that surface microstructures act as micro pressure chambers that would allow the sliding partners to reach hydrodynamic lubrication at lower operating speeds. Patterns of the microstructure that showed the highest pressure build-up in the simulations were then manufactured by Jet-ECM and tested in a tribometer. It was determined that patterned spherical segment cavities 10 ìm deep and 500 ìm wide yield a friction coefficient reduction of up to 35 %.