29 novembre 2019
Collège de France
Fuseau horaire Europe/Paris

Understanding shear bands characteristics and formation in model glasses through the measure of the local yield stress.

Non programmé
20m
Amphitéâtre Marguerite de Navarre (Collège de France)

Amphitéâtre Marguerite de Navarre

Collège de France

Paris
Poster Physics Lunch & Posters session

Orateur

Armand Barbot (PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France)

Description

Many phenomena remain poorly understood in amorphous materials such as plasticity and shear banding, their brittleness and disordered structure making it difficult to study them experimentally. As a consequence, we use model two-dimensional Lennard-Jones glasses and measure their local yield stress, a measure of the local softness, as presented in [1]. This method is nonperturbative and is applied on a well-controlled length scale. Applying it on well-relaxed glass under simple shear loading showed that the first plastic events create a local yield stress [2] diminution in the material which cause the emergence of a shear band [3]. Furthermore, we find that a single plastic event suffices to bring the local yield stress distribution to a well-defined value, thus essentially erasing the memory of the initial structure.

[1] A. Barbot et al., Phys. Rev. E, 97, 033001 (2018)
[2] S. Patinet et al., arXiv::cond-mat/1906.09818 (2019)
[3] A. Barbot et al., arXiv::cond-mat/1906.09663 (2019)

Field

Materials science

Language English

Auteur principal

Armand Barbot (PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France)

Co-auteurs

Matthias Lerbinger (PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France) Dr Anaël Lemaître (Université Paris-Est, Laboratoire Navier (UMR 8205), CNRS, ENPC, IFSTTAR, 2 allée Képler, F-77420 Marne-la-Vallée, France) Dr Damien Vandembroucq (PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France) Dr Sylvain Patinet (PMMH, CNRS UMR 7636, ESPCI Paris, PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France)

Documents de présentation

Aucun document.