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SUMMARY:Onset and stabilization of frictional motion
DTSTART:20111124T110000
DTSTAMP:20260929T203658Z
UID:984a49514328f2e17ff09f3d81a0f301c29ffa4e207883a516cfb6ba
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Rosario Capozza\nRecent experiments show that the onset of
  frictional motion and the associated stick-slip are ruled by the complex 
 rupture processes of microscopic contacts forming the interface of two con
 tacting bodies.\n\nTwo examples of this complexity are the stochasticity a
 ssociated to the stick-slip motion (e.g. irregularity in the intervals bet
 ween slip events) and the variability of static friction coefficient that\
 , in contrast to the common belief\, is not a material constant.\nIn the f
 irst case\, applying small-amplitude oscillations to the shear force\, we 
 show\, experimentally and theoretically\, that the stick-slip periods sync
 hronize. We further show that this phase locking is related to the inhibit
 ion of slow rupture modes which forces a transition to fast rupture\, prov
 iding a possible mechanism for observed remote triggering of earthquakes.\
 n\nIn the second case we provide a theoretical framework for understanding
  how and why for the same material the measured values of static friction 
 coefficient can vary within wide limits. More specifically\, we show:\n\n-
  What are the maximal and minimal values of static friction for the same m
 aterial and normal load.\n- What is a relation between the measured value 
 of static friction and the state of the slider and how to characterize thi
 s state.\n- What is the effect of loading configuration on static friction
 .
LOCATION:GC A1 416
STATUS:CONFIRMED
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