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URL:https://murmitoyen.com/events/vanille/udem/detail/507996
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Plasticity in amorphous solids – Prof. Joerg Rottler\, UBC
DESCRIPTION:Joerg Rottler\, UBC Department of Physics & Astronomy\, Univer
 sity of British Columbia\, 6224 Agricultural Road\, Vancouver\, B.C. V6T 1
 Z1\, CanadaAmorphous or glassy solids form a large group of materials that
  include polymeric and metallic glasses\, colloidal glasses\, foams\, emul
 sions and granular media. Although their many everyday applications rely o
 n the favourable mechanical properties of these materials\, the atomic lev
 el mechanisms of plasticity are much less understood than in crystals\, wh
 ere plastic flow can be ascribed to the motion of dislocations. The slow f
 low of amorphous solids exhibits striking heterogeneities: swift localized
  particle rearrangements take place in the midst of a more or less homogen
 eously deforming medium. Where do these plastic events occur\, and how do 
 they interact? In order to answer the first question\, we use molecular si
 mulations of a model glass former and show that structurally weak or 'soft
 ' spots can be identified from the low energy vibrational spectrum of the 
 solid\, at which plastic rearrangements occur much more frequently than el
 sewhere [1\,2]. Atomistic simulations\, however\, are limited to short len
 gth and time scales. We therefore propose a mesoscopic model that coarse-g
 rains the material into elastoplastic blocks of the size of a rearranging 
 region. Upon local yielding\, these blocks interact instantaneously with a
 n elastic Green's function so that plastic events become correlated in spa
 ce and time [3]. This model captures all essential aspects of the rheology
  and plastic correlations observed in the molecular simulation and provide
 s a promising stepping stone towards the development of a complete theory 
 of amorphous plasticity.J. Rottler\, S.S. Schoenholz\, A.J. Liu\, Physical
  Review E 89\, 042304 (2014)S.S. Schoenholz\, A.J. Liu\, R.A. Riggleman\, 
 J. Rottler\, Physical Review X 4\, 031014 (2014)A. Nicolas\, J. Rottler\, 
 J-L. Barrat\, The European Physical Journal E 37\, 1 (2014)Site web du gr
 oupe du Prof. RottlerCette conférence est présentée par le RQMP Versan
 t Nord du Département de physique de l'Université de Montréal et le D
 épartement de génie physique de Polytechnique Montréal.
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