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Statistical Physics, Biophysics and Condensed Matter Seminars
Seminar organized by the two teams of the group Statistical Mechanics and Condensed Matter.
Persons in charge: Alain BARRAT and Thibaut JONCKHEERE
Dedicated Day: Wednesday 16:00
Place: CPT, Amphitheater on the 5th floor
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Next Statistical Physics, Biophysics and Condensed Matter Seminars
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)