Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Tribology

O 6.2: Vortrag

Montag, 7. März 2016, 12:30–12:45, S053

From Static to Sliding Friction: Universal Ageing Law describes Sliding of Metallic Nanoparticles — Michael Feldmann, •Dirk Dietzel, and Andre Schirmeisen — Institute of Applied Physics, Justus Liebig University, Giessen, Germany

Everyday experience teaches us that static and sliding friction are very distinct phenomena: High forces are usually required to initiate sliding, while maintaining a sliding motion causes much less effort. Theoreticians, however, usually link such dynamic friction effects to a common mechanism referred to as contact ageing. While the existence of contact ageing is widely acknowledged (e.g. within rate and state theories) the fundamental processes on the nanoscale are much less clear. Here we will present nanomanipulation experiments of Sb particles on HOPG that will establish a clear correlation between static friction, sliding friction and contact ageing. By analyzing sliding instabilities (i.e. stick slip motion) it is found, that a universal ageing law based on nanorelaxations at the interface is applicable over 6 magnitudes of time and ultimately makes the distinction between static and sliding friction irrelevant.