4.5 Article

Non-monotonic Dynamics in the Onset of Frictional Slip

Journal

TRIBOLOGY LETTERS
Volume 70, Issue 2, Pages -

Publisher

SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-022-01598-z

Keywords

Static friction; Rate-and-state friction; Frictional aging; Slip

Funding

  1. European Research Council (ERC) under the European Union [833240]
  2. European Research Council (ERC) [833240] Funding Source: European Research Council (ERC)

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The transition from static to dynamic friction is often described as a fracture instability. However, studies on slow sliding processes suggest that this transition can be explained by considering the competition between contact aging and shear-induced rejuvenation.
The transition from static to dynamic friction is often described as a fracture instability. However, studies on slow sliding processes aimed at understanding frictional instabilities and earthquakes report slow friction transients that are usually explained by empirical rate-and-state formulations. We perform very slow (similar to nm/s) macroscopic-scale sliding experiments and show that the onset of frictional slip is governed by continuous non-monotonic dynamics originating from a competition between contact aging and shear-induced rejuvenation. This allows to describe both our non-monotonic dynamics and the simpler rate-and-state transients with a single evolution equation.

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