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SUMMARY:MEchanics GAthering -MEGA- Seminar: Shearing amorphous materials: 
 revising mean-field descriptions
DTSTART:20191212T161500
DTEND:20191212T173000
DTSTAMP:20260407T195521Z
UID:4681a0bf08412a65a9d0e3d5f434fdf75e1cef357147067fe17c3355
CATEGORIES:Conferences - Seminars
DESCRIPTION:Elisabeth Agoritsas\, PCSL\, EPFL\nAmorphous materials\, when
  submitted to an external deformation such as a constant shear\, are known
  to exhibit a nonlinear response\, signature of an out-of-equilibrium phas
 e transition. This highly nontrivial behaviour depends in fact crucially o
 n the intensity of the external driving\, which triggers randomly local pl
 astic rearrangements throughout the system\, thus constantly updating its 
 local disordered energy landscape. Linking on the one hand the collective 
 behaviour of these local plastic events\, and on the other hand the macros
 copic nonlinear response\, represents a challenging issue from the statist
 ical physics point of view of driven disordered systems.\n\nSeveral mean-f
 ield 'elasto-plastic' models have been developed\, at a mesoscopic scale d
 efined by the typical size of individual plastic events. These mean-field 
 descriptions have proven to be rather successful in reproducing certain fe
 atures observed in sheared disordered systems\, but not all at once\; more
 over\, a consistent picture connecting them is still missing. Here I will 
 discuss the physical ingredients that are put in such mean-field models\, 
 in particular the assumptions underlying the effective stochastic process 
 defining them. I will focus on the steady-state response of athermal syste
 ms\, when the velocity of the deformation (i.e. shear rate) is controlled\
 , discussing specifically the so-called `Hébraud-Lequeux’ model and its
  generalisations.\n\nRelated publications:\nE. Agoritsas\, E. Bertin\, K. 
 Martens\, & J.-L. Barrat\, Eur. Phys. J. E 38\, 71 (2015).\nE. Agoritsas &
  K. Martens\, Soft Matter 13\, 4653 (2017).\nD. A. Matoz-Fernandez\, E. Ag
 oritsas\, J.-L. Barrat\, E. Bertin\, & K. Martens\, Phys. Rev. Lett. 118\,
  158105 (2017).
LOCATION:MED 2 2423 https://plan.epfl.ch/?room==MED%202%202423
STATUS:CONFIRMED
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