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SUMMARY:Friction is fracture: frustrated cracks and slippery surfaces
DTSTART:20160202T100000
DTEND:20160202T110000
DTSTAMP:20260916T082112Z
UID:4a373622822d70b44c5151941d0687d9d4e7562833ff0b0bc7f11911
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Elsa Bayart\, The Hebrew University of Jerusalem\, Israel\
 nBio : Since October 2013 I am a postdoctoral fellow in the group of Prof.
  Jay Fineberg at the Hebrew University of Jerusalem in Israel. My current 
 research focuses on solid friction. I achieved my PhD at Laboratoire de Ph
 ysique Statistique in Ecole Normale Supérieure in Paris under the supervi
 sion of Prof. Mokhtar Adda-Bedia and Prof. Arezki Boudaoud\, working about
  the emergence of disorder by the confinement of an elastic rod. Prior to 
 that\, I earned a Master's degree in Physics of fluid and soft matter in U
 niversité Paris 6. After my PhD and before pursuing my academic career in
  Israel\, I had an experience in environmental engineering\, about sedimen
 t transport in rivers. My research focuses on experimental solids mechanic
 s\, including thin solids under large deformation\, mechanics of granular 
 material\, fracture mechanics and solid friction.\nAbstract :\nThe transit
 ion from static to sliding friction is mediated by interfacial shear crack
 s. These cracks break the solid contacts that form rough frictional interf
 aces and are quantitatively described in term of fracture mechanics. First
 \, we will focus on arrested frictional ruptures that serve as precursors 
 to sliding motion. We will show that fracture mechanics describe the spont
 aneous arrest of these precursory ruptures. This result shed light on the 
 actively debated question in seismology of the selection of an earthquake
 ’s magnitude and arrest. Then\, we will show surprising results about fr
 ictional interfaces coated by thin lubricant films. Even though the fricti
 onal strength of the system is reduced by the lubricant\, the fracture ene
 rgy (the amount of energy dissipated per unit area) is an order of magnitu
 de higher than in the case of dry friction. Fracture mechanics provide a n
 ew way to view the complex dynamics of the lubricated layer.
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STATUS:CONFIRMED
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