Jamming creep of a frictional interface.
We measure the displacement response of a frictional multicontact interface between identical polymer glasses to a biased shear force oscillation. We evidence the existence, for maximum forces close below the nominal static threshold, of a jamming creep regime governed by an aging-rejuvenation competition acting within the micrometer-sized contacting asperities. The time dependence of the creep process deviates from the standard Rice-Ruina [J. R. Rice and A. L. Ruina, J. Appl. Mech. 50, 343 (1983)] phenomenology at early times; this suggests the possibility of an aging-rejuvenation competition at much smaller scales, within the nanometer-thick adhesive junctions.
Bureau
L
L
Groupe de Physique des Solides, Universités Paris 6 et 7, UMR CNRS 7588, 2 place Jussieu, 75251 Paris, Cedex 05, France.
Baumberger
T
T
Caroli
C
C