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Thursday 27 February
Brittle yielding of amorphous solids at finite shear rates
Murari Singh (L2C, Montpellier)
Amorphous solids display a ductile to brittle transition as the kinetic stability of the quiescent glass is increased, which leads to a material failure controlled by the sudden emergence of a macroscopic shear band in quasistatic protocols. We numerically study how finite deformation rates influence ductile and brittle yielding behaviors using model glasses in two and three spatial dimensions. We find that a finite shear rate systematically enhances the stress overshoot of poorlyannealed systems, without necessarily producing shear bands. For wellannealed systems, the nonequilibrium discontinuous yielding transition is smeared out by finite shear rates and is accompanied by the emergence of multiple shear bands, as reported in metallic glass experiments. We show that the typical size of the bands and the distance between them increases algebraically with the inverse shear rate. We provide a dynamic scaling argument for the corresponding length scale, based on the competition between the deformation rate and the propagation time of the shear bands.
Seminars to come

Monday 2 March, 16h00 – 17h00
Stress dissipation and density singularities in athermal solids
Anier Hernandez Garcia (ESPCI) 
Wednesday 4 March, 14h00 – 15h00
Etats coherents generalises, Laplaciens magnetiques et processus determinantaux.
Nizar Demni, Université de Rennes 1 

Friday 13 March, 14h00 – 15h00
Intrinsic conformal geometry of nullinfinity and its gravitational wave
Yannick Herfray, Université Libre de Bruxelles 
Wednesday 18 March, 11h00 – 12h00
TBA (attention lieu et horaire inhabituel)
H.Isozaki, Tsukuba University, Japan 

Friday 20 March, 14h00 – 15h00
Séminaire Interactions fondamentales
Antoine Tilloy (Max Planck Institute of Quantum Optics, Munich) 

