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Séminaire LaMCoS (présentiel - INSA) : Local yield stress in model amorphous solids

Le 14 mars 2023

13h
Salle Bellecour-Terreaux (bât. Sophie Germain, INSA)

Langue / language: the presentation will be in English

Présenté par : Sylvain Patinet, PMMH, CNRS, ESPCI Paris, Université PSL, Sorbonne Université, Université Paris Cité, 75005 Paris, France

Sylvain Patinet, PMMH, CNRS, ESPCI Paris, Université PSL, Sorbonne Université, Université Paris Cité, 75005 Paris, France


Résumé au format pdf

Irreversible rearrangements on the particle scale are at the origin of permanent plastic deformations in solids While our understanding of plasticity has made remarkable progress for crystals, it remains relatively modest for amorphous solids, however ubiquitous in our daily life foams, gels, toothpaste, glasses, and granular media The main reason for this uncomfortable situation comes from their disordered structure, preventing the identification of the elementary mechanisms of plastic deformation, such as dislocation glide in crystals This numerical work addresses this challenge by developing a method to compute the local yield stresses in model glasses This technique allows us to efficiently sample the local plastic rearrangement thresholds non perturbatively for different loading directions and on well controlled length scales We show that the local yield stress method is very helpful in capturing the barrier dependencies to glass preparation, shear banding, and plastically induced anisotropy It is, therefore, an ideal tool for documenting what happens "inside" an amorphous solid and better characterising the relationship between structure and plasticity From a practical point of view, it makes it possible to envision more quantitative multi scale modelling strategies.