Flash weakening is limited by granular dynamics

Details Flash weakening is limited by granular dynamics Flash weakening is limited by granular dynamics

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3817305k&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 17, CiteID L17305

Physics

1

Physical Properties Of Rocks: Fracture And Flow, Seismology: Earthquake Dynamics (1242), Structural Geology: Fractures And Faults, Tectonophysics: Dynamics And Mechanics Of Faulting (8004), Tectonophysics: Rheology And Friction Of Fault Zones (8034)

Scientific paper

We measured the steady-state friction coefficient of granite over a wide range of sliding velocities and pressures. We observed considerable weakening, described well by a flash-heating theory, above the sliding velocity of 1 cm/s regardless of pressure. At higher velocities, the velocity strengthening behavior replaced the velocity weakening behavior. This strengthening at higher velocities agrees with data from numerical simulations on sheared granular matter and is therefore described in terms of energy dissipation due to the inelastic deformation of grains. We propose a unified steady-state friction law that well describes the velocity and pressure dependence of the steady-state friction coefficient.

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