Effect of surface roughness and adsorbates on superlubricity

Samoilov, V.N.; Yang, C.; Tartaglino, U.; Persson, B.N.

Авторы: Samoilov V.N., Yang C., Tartaglino U., Persson B.N.J
Сборник: Глава 8 в книге “Superlubricity”, Editors: A. Erdemir and J.-M. Martin
Глава в коллективной монографии
Год издания: 2007
Место издания: Elsevier, Amsterdam, The Netherlands, Oxford, United Kingdom
Первая страница: 131
Последняя страница: 146
DOI: 10.1016/B978-044452772-1/50039-1
Аннотация: Samoilov V.N., Yang C., Tartaglino U., Persson B.N.J. Effect of surface roughness and adsorbates on superlubricity. Глава 8 в книге “Superlubricity”, Editors: A. Erdemir and J.-M. Martin, Elsevier, Amsterdam, Oxford, 2007, p. 131-146, 14 figures. ISBN-13: 978-0-444-52772-1, ISBN-10: 0-444-52772-9. Publisher Summary: This chapter investigates the sliding of elastic solids in adhesive contact with flat and rough interfaces. The atoms in the bottom layer of the block form a simple square lattice with lattice constant a. Periodic boundary conditions are applied in the xy plane. The mass of a block atom is 197 amu and the lattice spacing of the block is a = 2.6 Å, so as to get the same atomic mass and density of gold. The lattice spacing of the substrate is b = 1.6 Å. In the absence of adhesion, contact mechanics theories predict that the area of real contact A between two elastic solids with randomly rough (but nominally flat) surfaces is proportional to the squeezing force. Extremely low sliding friction is possible only in the absence of elastic instabilities, and this is possible for stiff enough solids with incommensurate (or nearly incommensurate) surface structures. However, any types of imperfections may “lock” the surfaces together and introduce elastic instabilities during sliding. One type of defect is surface roughness and another possibility is adsorbed molecules.
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Effect of surface roughness and adsorbates on superlubricityстатья Глава в книге

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