Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 38: Invited talk Pastewka
MM 38.1: Hauptvortrag
Mittwoch, 9. März 2016, 15:00–15:30, H38
Models for adhesion, friction and wear across the scales — •Lars Pastewka1, Peter Gumbsch1,2, Michael Moseler2, Gianpietro Moras2, Anke Peguiron2, and Mark Robbins3 — 1Karlsruhe Institute of Technology, Institute for Applied Materials, Karlsruhe, Germany — 2Fraunhofer IWM, Freiburg, Germany — 3Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, USA
Adhesion, friction and wear are processes where the surface of a material plays a central role. Studying these processes is made complicated by most surfaces rough topography, their interaction with the environment, and the inaccessibility of the interface between two materials to in situ experimental techniques. In this talk, I give examples of how computer simulations at mesoscopic to atomic scales can help to elucidate the processes that take place at these buried interfaces. Mesoscopic simulations of elastic contact between randomly rough surfaces allow a direct calculation of the area of intimate atomic contact and reveal emergence of macroscopic adhesion as a function of topography and microscopic surface forces. Conditions within the contacting regions are typically extreme and give rise to severe plastic deformation and change of the material microstructure. Atomic-scale calculations based on classical molecular dynamics, tight-binding and density-functional theory under such conditions reveal how this “tribomutation” evolves in diamond and amorphous carbon, and how its formation facilitates wear of these materials in contact with each other and in contact with oxide ceramics.