Nanotribology

© Fraunhofer IWM

The complexity of friction phenomena results from their being inherently multiscale. The computer aided design of tribocontacts is therefore able to handle all scales of the atomistic description of the contact up to the elasto-hydrodynamics of the lubrication gap. Quantum chemical calculations describe possible reactions between basic lubricants, additives, oxygen and the involved surface. Molecular dynamic simulations provide the boundary conditions for continuum-mechanical lubricant simulations. Molecular dynamic and mesodynamic simulations shed light on the impact of micro - and nanostructuring of tribo surfaces on friction behavior and prescribe design rules for structuring. Mesoscopic modelling of the dynamics of non-Newtonian lubricants contributes to the optimization of shear flows.

Publications

 

Greiner, C.; Liu, Z.; Schneider, R. ; Pastewka, L.; Gumbsch, P., The origin of surface microstructure evolution in sliding friction, Scripta Materialia 153 (2018) 63-67 Link

Klemenz, A.; Gola, A.; Moseler, M.; Pastewka, L., Contact mechanics of graphene-covered metal surfaces, Applied Physics Letters 112/6 (2018) 061601 1-12 Link

Kuwahara; T.; Moras, G.; Moseler, M., Role of oxygen functional groups in the friction of water-lubricated low-index diamond surfaces, Physical Review Materials 2/7 (2018) 073606 1-11 Link

Moras, G.; Klemenz, A.; Reichenbach, T.; Gola, A.; Uetsuka, H.; Moseler, M.; Pastewka, L., Shear melting of silicon and diamond and the disappearance of the polyamorphic transition under shear, Physical Review Materials 2/8 (2018) 0836011-6 Link

Weber, B.; Suhina, T.; Junge, T.; Pastewka, L.;  Brouwer, A.M.; Bonn, D.,  Molecular probes reveal deviations from Amontons' law in multi-asperity frictional contacts, Nature Communications 9 (2018) Art. 888, 7 Seiten Link

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