Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 111, Issue 24, Pages 8764-8769Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1321752111
Keywords
friction; multiscale modeling; onset of sliding; stick-slip
Categories
Funding
- bilateral researcher exchange program Aurora (Hubert Curien Partnership)
- Norwegian Research Council
- French Ministry of Foreign Affairs and International Development [27436PM, 213213]
- People Programme (Marie Curie Actions) of the European Union's 7th Framework Programme under Research Executive Agency [303871]
- Statoil - Norwegian Academy of Science and Letters
- Center of Excellence grant
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The failure of the population of microjunctions forming the frictional interface between two solids is central to fields ranging from biomechanics to seismology. This failure is mediated by the propagation along the interface of various types of rupture fronts, covering a wide range of velocities. Among them are the so-called slow fronts, which are recently discovered fronts much slower than the materials' sound speeds. Despite intense modeling activity, the mechanisms underlying slow fronts remain elusive. Here, we introduce a multiscale model capable of reproducing both the transition from fast to slow fronts in a single rupture event and the short-time slip dynamics observed in recent experiments. We identify slow slip immediately following the arrest of a fast front as a phenomenon sufficient for the front to propagate further at a much slower pace. Whether slow fronts are actually observed is controlled both by the interfacial stresses and by the width of the local distribution of forces among microjunctions. Our results show that slow fronts are qualitatively different from faster fronts. Because the transition from fast to slow fronts is potentially as generic as slow slip, we anticipate that it might occur in the wide range of systems in which slow slip has been reported, including seismic faults.
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