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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-395@lptms.universite-paris-saclay.fr
DTSTART:20160126T110000Z
DTEND:20160126T120000Z
DTSTAMP:20160112T073716Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-elisabeth-agoritsas/
SUMMARY:Séminaire du LPTMS: Elisabeth Agoritsas - LPTMS\, salle 201\, 2èm
 e étage\, Bât 100\, Campus d'Orsay - 26 Jan 16 11:00
DESCRIPTION:\n\nRevisiting mean-field elasto-plastic models at the mesoscop
 ic scale\n\nElisabeth Agoritsas (Université Grenoble-Alpes)\n\nEncompassi
 ng very dissimilar systems (such as foams\, emulsions\, or granular materi
 als)\, amorphous materials are composed of constituents of different shape
 s and sizes\, such as bubbles in a soap foam or sand grains in a sandpile\
 , so that they exhibit a structural disorder that plays a determinant role
  in their mechanical properties\, while challenging their very description
 . Several elasto-plastic models have been developed at the mesoscopic scal
 e\, in order to account for the plasticity in sheared amorphous materials\
 , such as the Hébraud- Lequeux (HL) model [P. Hébraud &amp\; F. Lequeux
 \, Phys.Rev.Lett. 81\, 2934 (1998)]. They have proven to be rather success
 ful in reproducing certain features observed in amorphous systems\, but no
 t all at once. Moreover\, a consistent picture connecting them is still mi
 ssing. Here we discuss the physical ingredients that are put in such mean-
 field models\, distinguishing between thermal and mechanical noises in the
  mean-field dynamics of amorphous materials. We focus in particular on the
  role of structural disorder\, implemented by means of a distribution of e
 nergy barriers for the system to overcome locally when an external constan
 t shear rate is applied to the material\, and discuss specifically its imp
 lications for a generalization of the HL model [E. Agoritsas et al.\, Eur.
 Phys.J.E 38\, 71 (2015)].\n\n
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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