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SUMMARY:EVENT CANCELLED: Emergence of crack-like behavior of frictional ru
 pture
DTSTART:20210311T121500
DTEND:20210311T131500
DTSTAMP:20260428T021452Z
UID:45df7b14ae6972b6e4665f0b06c95f153a309e16653ae88403d5b56e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Jean-François MOLINARI Computational Solid Mechanics La
 boratory\, EPFLCon\nAbstract :\nThe process of frictional rupture\, i.e.\,
  the failure of frictional systems\, abounds in the technological and natu
 ral world around us\, ranging from squealing car brake pads to earthquakes
  along geological faults. A general framework for understanding and interp
 reting frictional rupture commonly involves an analogy to ordinary crack p
 ropagation\, with far-reaching implications for various disciplines from e
 ngineering tribology to geophysics. An important feature of the analogy to
  cracks is the existence of a reduction in the stress-bearing capacity of 
 the ruptured interface\, i.e.\, of a drop from the applied stress\, realiz
 ed far ahead of a propagating rupture\, to the residual stress left behind
  it. Yet\, how and under what conditions such finite and well-defined stre
 ss drops emerge from basic physics are not well understood.\nIn the first 
 part of this talk\, we show that for a rapid rupture a stress drop is dire
 ctly related to wave radiation from the frictional interface to the bodies
  surrounding it and to long-range bulk elastodynamics and not exclusively 
 to the physics of the contact interface. Furthermore\, we show that the em
 ergence of a stress drop is a transient effect\, affected by the wave trav
 el time in finite systems and by the decay of long-range elastic interacti
 ons. Finally\, we supplement our results for rapid rupture with prediction
 s for a slow rupture. All of the theoretical predictions are supported by 
 available experimental data and by extensive computations.\nIn the second 
 part\, we show that for generic and realistic frictional constitutive rela
 tions\, and once the necessary conditions for the emergence of an effectiv
 e crack-like behavior are met\, frictional rupture dynamics are approximat
 ely described by a crack-like\, fracture mechanics energy balance equation
 . This is achieved by independently calculating the intensity of the crack
 -like singularity along with its associated elastic energy flux into the r
 upture edge region\, and the frictional dissipation in the edge region. We
  further show that while the fracture mechanics energy balance equation pr
 ovides an approximate\, yet quantitative\, description of frictional ruptu
 re dynamics\, interesting deviations from the ordinary crack-like framewor
 k — associated with non-edge-localized dissipation — exist. Together w
 ith the results about the emergence of stress drops in frictional rupture\
 , this work offers a comprehensive and basic understanding of why\, how an
 d to what extent frictional rupture might be viewed as an ordinary fractur
 e process.
LOCATION:https://ethz.zoom.us/j/94817809233?pwd=N0pzbnQwSFFTQnVPcVR3SkNrd2
 9OQT09
STATUS:CONFIRMED
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