Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 88: Symposium Nanotribology
O 88.5: Hauptvortrag
Freitag, 26. März 2010, 12:15–12:45, H1
The friction of wrinkles — •Martin H. Müser1 and Hamid Mohammadi2 — 1Universität des Saarlandes, Saarbrücken, Germany — 2University of Western Ontario, London, Ontario, Canada
When in contact with an adhering particle, elastic sheets possess competing mechanically stable, wrinkled geometries if their thickness is below a critical value. Using molecular dynamics simulations, we show that adhering particles moving laterally over a wrinkled elastic sheet induce instability transitions of the wrinkles. These dynamics produce a frictional force between the particles and the sheet that can be well described with the Coulomb law of friction for solids. Analytical models for buckled rods are presented that allow one to rationalize the frictional response of wrinkles. We will also discuss the implications of our results for tribological experiments of graphite sheets that are only a few layers thick.