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Static friction coefficient depends on geometry
Citation Link: https://doi.org/10.15480/882.16761
Publikationstyp
Journal Article
Date Issued
2026-02-06
Sprache
English
Author(s)
TORE-DOI
Journal
Volume
148
Issue
6
Article Number
061502
Citation
Journal of Tribology 148 (6): 061502 (2026)
Publisher DOI
Scopus ID
Publisher
American Society of Mechanical Engineers (ASME)
Classical theories state that the friction coefficient is independent of geometry, depending only on the real contact area determined by roughness. However, experimental evidence shows significant differences between static and dynamic friction coefficients. Recent models introduce an energetic theory for friction, analogous to the Griffith theory for fracture, resulting in a constant dynamic friction coefficient at heavy loads but a larger static coefficient at low loads. We show that, for power-law punches, the ratio of static to dynamic friction coefficients at low normal loads is higher for flatter profiles and, in principle, grows unbounded at zero load. This may explain the observed variability in friction ratios. The model’s predictions align well with recent experimental results.
Subjects
contact area
contact mechanics
fracture
friction
interfacial energy
power-law punch
tribology
DDC Class
531: Classical Mechanics
620.1: Engineering Mechanics and Materials Science
Publication version
publishedVersion
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Name
trib-25-1566.pdf
Type
Main Article
Size
1.56 MB
Format
Adobe PDF