From Molecular to Multiasperity Contacts: How Roughness Bridges the Friction Scale Gap.

ABSTRACT: The tangential force required to observe slip across a whole frictional interface can increase over time under a constant load, due to any combination of creep, chemical, or structural changes of the interface. In macroscopic rate-and-state models, these frictional aging processes are lumped into an ad hoc state variable. Here we explain, for a frictional system exclusively undergoing structural aging, how the macroscopic friction response emerges from the interplay between the surface roughness and the molecular motion within adsorbed monolayers. The existence of contact junctions and their friction dynamics are studied through coupled experimental and computational approaches. The former provides detailed measurements of how the friction force decays, after the stiction peak, to a steady

SUBMITTER: Frerot L 

PROVIDER: S-EPMC9933612 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature