TY  - JOUR
AU  - Bar-Sinai, Yohai
AU  - Spatschek, Robert
AU  - Brener, Efim
AU  - Bouchbinder, Eran
TI  - On the velocity-strengthening behavior of dry friction
JO  - Journal of geophysical research / Solid earth
VL  - 119
IS  - 3
SN  - 2169-9313
CY  - Hoboken, NJ
PB  - Wiley
M1  - FZJ-2014-06816
SP  - 1738 - 1748
PY  - 2014
AB  - The onset of frictional instabilities, e.g., earthquakes nucleation, is intimately related to velocity-weakening friction, in which the frictional resistance of interfaces decreases with increasing slip velocity. While this frictional response has been studied extensively, less attention has been given to steady state velocity-strengthening friction, in spite of its potential importance for various aspects of frictional phenomena such as the propagation speed of interfacial rupture fronts and the amount of stored energy released by them. In this note we suggest that a crossover from steady state velocity-weakening friction at small slip velocities to steady state velocity-strengthening friction at higher velocities might be a generic feature of dry friction. We further argue that while thermally activated rheology naturally gives rise to logarithmic steady state velocity-strengthening friction, a crossover to stronger-than-logarithmic strengthening might take place at higher slip velocities, possibly accompanied by a change in the dominant dissipation mechanism. We sketch a few physical mechanisms that may account for the crossover to stronger-than-logarithmic steady state velocity strengthening and compile a rather extensive set of experimental data available in the literature, lending support to these ideas.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000336844700012
DO  - DOI:10.1002/2013JB010586
UR  - https://juser.fz-juelich.de/record/173406
ER  -