Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Poster session I
MM 15.38: Poster
Montag, 7. März 2016, 18:00–20:00, Poster B3
Friction under active control — •Victor Pfahl1, Walter Arnold1,2, and Konrad Samwer1 — 11. Physikalisches Institut, Universität Göttingen — 2Department of Materials Science, Saarland University
Dissipation of mechanical and kinetic energy at a sliding contact – better known as friction – strongly depends on the topological structure and chemistry of the contact and on the dissipation mechanism of the underlying material. But instead of varying these internal mechanisms we are using external acoustic excitations – which is called sonolubricity – to control friction actively.
Friction is measured with the lateral force microscopy (LFM) mode of an atomic force acoustic microscope (AFAM) with the simultaneous excitation of the contact resonance frequency of the AFAM cantilever. The cantilever is moving periodically resulting in a reduced average contact force and therefore the friction coefficient is reduced as well.
We investigated the reduction of friction of Si, PdCuSi, and LaSrMnO as a function of amplitude of the cantilever at different temperatures. We report a reduction of friction up to 100% on every sample. Due to a metal-insulator transition near 350K especially temperature dependent measurements on LaSrMnO are interesting. A different reduction – amplitude relation is found in the metallic phase in comparison to the insulating phase.
We thank the German Science Foundation for funding within the SFB CRC 1073, project A1.