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SUMMARY:Disorder and fluctuations in the yielding transition of amorphous 
 solids under strain - Gilles Tarjus\, LPTMC CNRS/Sorbonne Universite Paris
DTSTART:20200114T130000Z
DTEND:20200114T140000Z
UID:TALK136183@talks.cam.ac.uk
CONTACT:Professor Mike Cates
DESCRIPTION:When slowly deformed at low temperature from an initial quiesc
 ent state\, amorphous solids yield beyond some finite level of applied str
 ain and reach a steady state characterized by plastic flow. The way yieldi
 ng takes place is classified in two main categories: the “brittle” ext
 reme where the sample catastrophically breaks into pieces and show macrosc
 opic shear bands\, as often observed in molecular and metallic glasses\, a
 nd “ductile” behavior in which plastic deformation increases progressi
 vely\, commonly found in soft-matter glassy systems. We argue on the basis
  of analytically solvable mean-field elasto-plastic models and extensive c
 omputer simulations of generic atomic glasses that the variety of behavior
  can be understood within a unique theoretical framework. The nature of yi
 elding is shown to depend on the degree of effective disorder which is con
 trolled by the preparation of the amorphous solid. Yielding evolves from a
  mere crossover for poorly annealed samples to a nonequilibrium discontinu
 ous transition for well-annealed\, very stable samples. The transition bet
 ween these two regimes is marked by a random critical point analogous to w
 hat found out of equilibrium in a random-field Ising model.\n
LOCATION:MR11\, CMS
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