Grups de recerca
13
oct
Seminari FMC: Ezequiel Ferrero
Arrenquem la sèrie de Seminaris del departament de Física de la Matèria Condensada amb la xerrada d’Ezequiel Ferrero, actualment postdoc al departament i investigador adjunt del CONICET al Centro Atómico Bariloche (Argentina), que ens parlarà de la transició de “yielding” en materials amorfs com per exemple escumes o emulsions.
Properties and emergent features of the yielding transition of amorphous solids under deformation
Ezequiel Ferrero (ezequiel.ferrero@ub.edu)
Postdoctoral researcher in the condensed matter physics department, UB
Adjunct Researcher of CONICET at Bariloche Atomic Centre, Argentina
In this talk I will describe the yielding transition in the deformation of amorphous materials (such as foams, emulsions, colloidal glasses or metallic glasses) from the point of view of statistical physics. After a general introduction to the subject and the so-called "elastoplastic models" used in the field, I will concentrate on emergent features and critical properties of this dynamical phase transition. In particular, I will give an overview of the avalanche statistics related to the characteristic stick-slip behavior observed in yielding, I will characterize the flowcurve according to the yielding rules, and will talk about the thermal rounding of the transition. In passing, I'll be reviewing the current understanding of yielding in analogy with the depinning transition of elastic manifolds in disordered media. (Only) If time allows, I might also speak briefly of yielding under oscillatory deformation.
To dig more in depth you might grasp on the abstracts of these references:
- Driving rate dependence of avalanche statistics and shapes at the yielding transition Phys. Rev. Lett. 116, 065501 (2016)
- Inertia and universality of avalanche statistics: The case of slowly deformed amorphous solids Phys. Rev. E 95, 013003 (2017)
- Deformation and flow of amorphous solids: a review of mesoscale elastoplastic models, Rev. Mod. Phys. 90, 045006 (2018)
- Criticality in elastoplastic models of amorphous solids with stress-dependent yielding rates, Soft Matter 15, 9041 (2019)
- Elastic Interfaces on Disordered Substrates: From Mean-Field Depinning to Yielding, Phys. Rev. Lett. 123, 218002 (2019)
- Properties of the density of shear transformations in driven amorphous solids, J. Phys.: Condens. Matter 33 124001 (2021)
- The yielding of amorphous solids at finite temperatures Phys. Rev. Materials 5, 115602 (2021)
- The Fate of Shear-Oscillated Amorphous Solids J. Chem. Phys. 156, 104902 (2022)
