Driving rate dependence of avalanche statistics and shapes at the yielding transition

Abstract

We study stress time series caused by plastic avalanches in athermally sheared disordered materials. Using particle-based simulations and a mesoscopic elastoplastic model, we analyze system size and shear-rate dependence of the stress-drop duration and size distributions together with their average temporal shape. We find critical exponents different from mean-field predictions, and a clear asymmetry for individual avalanches. We probe scaling relations for the rate dependency of the dynamics and we report a crossover towards mean-field results for strong driving.Fil: Liu, Chen. Centre National de la Recherche Scientifique; Francia. Universite Grenoble Alpes; FranciaFil: Ferrero, Ezequiel E.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Centre National de la Recherche Scientifique; Francia. Universite Grenoble Alpes; FranciaFil: Puosi, Francesco. Centre National de la Recherche Scientifique; Francia. Universite Grenoble Alpes; Francia. Ecole Normale Superieure de Lyon; FranciaFil: Barrat, Jean Louis. Universite Grenoble Alpes; Francia. Centre National de la Recherche Scientifique; FranciaFil: Martens, Koen. Universite Grenoble Alpes; Francia. Centre National de la Recherche Scientifique; Franci