Driving Rate Dependence of Avalanche Statistics and Shapes at the Yielding Transition

C Liu and EE Ferrero and F Puosi and JL Barrat and K Martens, PHYSICAL REVIEW LETTERS, 116, 065501 (2016).

DOI: 10.1103/PhysRevLett.116.065501

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 shearrate 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.

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