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20 janvier 2020: 1 événement

  • Séminaires Invités

    Lundi 20 janvier 14:00-15:30 - Misaki Ozawa - Département de Physique, Ecole Normale Supérieure, Paris

    Computational Study of Brittle and Ductile Yielding

    Résumé : When a material is mechanically deformed from an initial quiescent glassy state, two different types of yielding behaviors can be observed. One is “brittle” yielding, where the sample catastrophically breaks, as a smartphone screen breaks sharply. The other one is “ductile” yielding, for which the sample deforms significantly, just like when toothpaste is slowly crushed by a toothbrush. It is known that a given material may show brittle or ductile yielding depending on the sample preparation history. The understanding transformation from brittle to ductile behaviors is a major challenge in many fields, from material science to geophysics. We address this problem, performing extensive computer simulations by changing the stability of the initial glassy state significantly using swap Monte Carlo simulations. We clarify the presence of critical stability separating brittle and ductile yielding behaviors in various rheological settings, from shear start-up conditions for two and three-dimensional glasses in slow and fast driving, to cyclic deformation protocols, which is relevant for experimental situations from the rheology of soft materials to fatigue failure in metallic glasses.

    contact : Kirsten Martens

    Lieu : LIPHY, conference room - 140 Avenue de la Physique 38402 Saint Martin d’Hères

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