Crack-like processes governing the onset of frictional slip. Rubinstein, S. M.; Shay, M.; Cohen, G.; and Fineberg, J. Int. J. Fract., 140:201--212, Jul, 2006.
abstract   bibtex   
We perform real-time measurements of the net contact area between two blocks of like material at the onset of frictional slip. We show that the process of interface detachment, which immediately precedes the inception of frictional sliding, is governed by three different types of detachment fronts. These crack-like detachment fronts differ by both their propagation velocities and by the amount of net contact surface reduction caused by their passage. The most rapid fronts propagate at intersonic velocities but generate a negligible reduction in contact area across the interface. Sub-Rayleigh fronts are crack-like modes which propagate at velocities up to the Rayleigh wave speed, VR, and give rise to an approximate 10 percent reduction in net contact area. The most efficient contact area reduction (similar to 20percent) is precipitated by the passage of 'slow detachment fronts'. These fronts propagate at 'anomalously' slow velocities, which are over an order of magnitude lower than VR yet orders of magnitude higher than other characteristic velocity scales such as either slip or loading velocities. Slow fronts are generated, in conjunction with intersonic fronts, by the sudden arrest of sub-Ray-leigh fronts. No overall sliding of the interface occurs until either of the slower two fronts traverses the entire interface, and motion at the leading edge of the interface is initiated. Slip at the trailing edge of the interface accompanies the motion of both the slow and sub-Rayleigh fronts. We might expect these modes to be important in both fault nucleation and earthquake dynamics.
@article{rubinstein2006,
	Abstract = {We perform real-time measurements of the net contact
area between two blocks of
like material at the onset of frictional slip. We show that the process
of interface detachment,
which immediately precedes the inception of frictional sliding, is
governed by three different types
of detachment fronts. These crack-like detachment fronts differ by both
their propagation velocities
and by the amount of net contact surface reduction caused by their
passage. The most rapid fronts
propagate at intersonic velocities but generate a negligible reduction
in contact area across the
interface. Sub-Rayleigh fronts are crack-like modes which propagate at
velocities up to the Rayleigh
wave speed, VR, and give rise to an approximate 10 percent reduction in
net contact area. The most
efficient contact area reduction (similar to 20percent) is precipitated
by the passage of 'slow
detachment fronts'. These fronts propagate at 'anomalously' slow
velocities, which are over an order
of magnitude lower than VR yet orders of magnitude higher than other
characteristic velocity scales
such as either slip or loading velocities. Slow fronts are generated, in
conjunction with intersonic
fronts, by the sudden arrest of sub-Ray-leigh fronts. No overall sliding
of the interface occurs
until either of the slower two fronts traverses the entire interface,
and motion at the leading edge
of the interface is initiated. Slip at the trailing edge of the
interface accompanies the motion of
both the slow and sub-Rayleigh fronts. We might expect these modes to be
important in both fault
nucleation and earthquake dynamics.},
	Author = {Rubinstein, S. M. and Shay, M. and Cohen, G. and Fineberg, J.},
	Issue = {1-4},
	Journal = {Int. J. Fract.},
	Month = {Jul},
	Pages = {201--212},
	Title = {Crack-like processes governing the onset of frictional slip},
	Volume = {140},
	Year = {2006},
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