ESPCI web site
PMMH’s weekly seminar is held every Friday at 11 am (map)
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH - Corrado Rainone (Weizmann Institute, Israel)
Shear bands as manifestation of a criticality in yielding amorphous solids.
The nature of the yielding transition in amorphous solids is a long-standing riddle which has attracted a lot of research effort in recent years. Recently, some of us have proposed a picture of yielding as a first-order like transition in a suitable overlap order parameter, measuring the degree of similarity between configurations within a given glass sample. Within this picture, yielding is identified with a spinodal point with
disorder whereupon the high-overlap phase reaches its stability limit.
Spinodal points with disorder are always associated with heterogeneities which can be picked up by suitable multi-point correlators and whose lenghtscale grows rapidly on approaching the spinodal, the dynamical heterogeneities around the Mode Coupling Crossover being such an example. In this work we derive, with the aid of replica theory, an expression for a multi-point correlator which we then show to be able, in simulation, to pick up and characterize the spinodal-like criticality of the yielding transition, including the presence of a growing correlation lenght associated with heterogeneous excitations which become system-spanning at the yielding point. We argue that these excitations correspond with system-spanning shear bands which cause the glass to undergo a global particle rearrangement and fail mechanically.
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
