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Decrease of Static Friction Coefficient with Interface Growth from Single to Multiasperity Contact.
Peng L, Roch T, Bonn D and 1 other
Physical review letters1 May 2025Open access
Decrease of Static Friction Coefficient with Interface Growth from Single to Multiasperity Contact.
Peng L, Roch T, Bonn D and 1 other · Physical review letters · 1 May 2025
Abstract
The key parameter for describing frictional strength at the onset of sliding is the static friction coefficient. Yet, how the static friction coefficient emerges at the macroscale from contacting asperities at the microscale is still an open problem. Here, we present friction experiments in which the normal load was varied over more than 3 orders of magnitude, so that a transition from a single asperity contact at low loads to multiasperity contacts at high loads was achieved. We find a remarkable reduction in the friction drop (the ratio of the static friction force to the dynamic friction force) with increasing normal load. Using a simple stick-slip transition model we identify the presence of presliding and subcritical contact points as the cause of smaller static friction coefficient at increased normal loads. Our measurements and model bridge the gap between friction behavior commonly observed in atomic force microscopy experiments at microscopic forces, and industrially relevant multiasperity contact interfaces loaded with macroscopic forces.
Identifiers
- NobleID
- NI6P81W69R26S34
Discussion
Citations
Details
- Authors
- Peng L, Roch T, Bonn D, Weber B
- Published
- 1 May 2025
- Publisher
- American Physical Society (APS)
- Issue
- Volume 134 · Issue 17
- ISSN
- 0031-9007
- Language
- EN