Controlling Microscopic Friction through Mechanical Oscillations

Details Controlling Microscopic Friction through Mechanical Oscillations Controlling Microscopic Friction through Mechanical Oscillations

2011-06-13

arxiv.org/abs/1106.2430v1

Physical Review E 78, 036110 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevE.78.036110

We study in detail the recent suggestions by Tshiprut et al. [Phys. Rev. Lett. 95, 016101 (2005)] to tune tribological properties at the nanoscale by subjecting a substrate to periodic mechanical oscillations. We show that both in stick-slip and sliding regimes of motion friction can be tuned and reduced by controlling the frequency and amplitude of the imposed substrate lateral excitations. We demonstrate that the mechanisms of oscillation-induced reduction of friction are different for stick-slip and sliding dynamics. In the first regime the effect results from a giant enhancement of surface diffusion, while in the second regime it is due to the interplay between washboard and oscillation frequencies that leads to the occurrence of parametric resonances. Moreover we show that for particular set of parameters it is possible to sustain the motion with the only oscillations.

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