Issue |
Europhys. Lett.
Volume 54, Number 5, June 2001
|
|
---|---|---|
Page(s) | 693 - 699 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2001-00371-6 | |
Published online | 01 December 2003 |
Friction laws for elastic nanoscale contacts
Institut für Physik, Johannes Gutenberg-Universität -
55099 Mainz, Germany
Received:
30
October
2000
Accepted:
16
March
2001
The effect of surface curvature on the law relating frictional
forces F with normal load L is investigated by molecular dynamics
simulations as a function of surface symmetry, adhesion, and
contamination. Curved, non-adhering, dry, commensurate surfaces show a linear
dependence, , similar to dry flat commensurate or amorphous
surfaces and macroscopic surfaces.
In contrast, curved, non-adhering, dry, amorphous surfaces
show
similar to friction force microscopes.
Curved lubricated or contaminated
surfaces show again different behaviour; details depend on
how much of the contaminant gets squeezed out of the contact.
The shear stress distribution in the contact is highly non-uniform
in all cases, i.e.
it is seen that the friction force in the lubricated case
is mainly due to atoms at the entrance of the tip.
PACS: 81.40.Pq – Friction, lubrication, and wear / 46.55.+d – Tribology and mechanical contacts / 07.79.Sp – Friction force microscopes
© EDP Sciences, 2001
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