Issue
EPL
Volume 87, Number 6, September 2009
Article Number 66002
Number of page(s) 5
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/87/66002
Published online 07 October 2009
EPL, 87 (2009) 66002
DOI: 10.1209/0295-5075/87/66002

Deep bulk atoms in a solid cause friction

Seiji Kajita, Hitoshi Washizu and Toshihide Ohmori

Toyota Central R&D Labs., Inc. - 41-1, Yokomichi, Nagakute, Nagakute-cho, Aichi 480-1192, Japan

e1389@mosk.tytlabs.co.jp

received 4 June 2009; accepted in final form 7 September 2009; published September 2009
published online 7 October 2009

Abstract
To analyze kinetic friction between solids on the atomic scale, a coupled-oscillator surface model including an infinite number of atomic layers is developed by a self-consistent scheme using a Green's function. The numerical approach shows that friction involves not only surface atoms and their interaction with an opposite surface but also bulk atoms in a solid. Energy transfer from kinetic energy of a sliding solid to low-frequency lattice vibration occurs in the presence of bulk atoms, and energy dissipation into the bulk system leads to friction.

PACS
68.35.Af - Atomic scale friction.
46.55.+d - Tribology and mechanical contacts.
81.40.Pq - Friction, lubrication and wear.

© EPLA 2009