Origin of static friction and its relationship to adhesion at the atomic scale
Abstract
Using atomic scale interfaces consisting of slabs of the same materials, we study the relationship between adhesion and static friction. The work of separation, which is a measure of adhesion, and the spatial variation of the interface potential energy along the sliding direction are computed for both commensurate and incommensurate Al2O3/Al2O3 interfaces, and incommensurate smooth and rough Al/Al interfaces. These values are compared with the predicted static friction stress resulting from constant force and constant velocity molecular dynamics simulations. Simulation results show that static friction is not determined by the absolute value of adhesion. Rather, it is determined by the change of potential energy along the sliding direction.
Additional Information
© 2007 The American Physical Society. (Received 19 June 2006; revised 27 November 2006; published 27 April 2007) The authors wish to acknowledge Y.T. Cheng and M.H. Müser for useful discussions on the results. Support of the Caltech research was provided through a grant from General Motors. The facilities of MSC are supported by funding from ONR-DURIP, ARO-DURIP, and Beckman Institute with additional funding from NSF, NIH, DoE, ONR, DARPA, Nissan, ChevronTexaco, Dow-Corning, Intel, Aventis Pharma, and Berlex Biopharma.Attached Files
Published - ZHAprb07a.pdf
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Additional details
- Eprint ID
- 8565
- Resolver ID
- CaltechAUTHORS:ZHAprb07a
- Created
-
2007-08-20Created from EPrint's datestamp field
- Updated
-
2021-11-08Created from EPrint's last_modified field
- Other Numbering System Name
- WAG
- Other Numbering System Identifier
- 0709