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Tristan Albaret1 Francesca Boioli1 Anne Tanguy2 David Rodney1

1, Université Lyon 1, Villeurbanne, Auvergne-Rhône-Alpes , France
2, INSA de Lyon, Villeurbanne, Auvergne-Rhône-Alpes , France

The mechanical properties of amorphous systems are expected to be tightly related with the identification and the characterization of the elementary events at the origin of plasticity. Interestingly, these localized events involving rearrangements at the atomic scale can be associated, from a continuous perspective, to mechanical heterogeneities also known as Eshelby inclusions. The representation of plasticity in terms of Eshelby inclusions should help to bridge between length scales, to link the atomistic description with the mesoscopic models of plasticity and to access macroscopic properties. Eshelby inclusions have already been used to understand the structure of shear bands[1], to explore the potential energy landscape of a model sheared glass[2] and also to study the dynamical aspects of the elementary plastic events[3]. More importantly, the signature of Eshelby inclusions have been identified from experiments in colloidal systems[4].
In this presentation I will briefly review our technique to extract Eshelby inclusions from molecular dynamics simulations. Then, I will show how this approach can be used to inform mesoscopic models, for instance by calculating the energy barriers associated to the elementary plastic events. In the last part I will discuss the effect of external parameters and especially the effect of the shear rate which is currently the subject of active research within our group.

[1] R. Dasgupta, H.G.E. Hentschel, I. Procaccia Phys. Rev. Lett. 109:255502 (2012)
[2] F. Boioli, T. Albaret, D. Rodney Phys. Rev. E 95:033005 (2017)
[3] F. Puosi, J. Rottler, J-L Barrat Phys. Rev. E 89:042302 (2014)
[4] P. Schall, D.A. Weitz, F. Spaepen Science 318, 1895 (2007)

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