Robustness of avalanche dynamics in sheared amorphous solids as probed by transverse diffusion.

Phys Rev E Stat Nonlin Soft Matter Phys

Laboratoire Navier, Université Paris Est, ENPC-ParisTech, LCPC, CNRS UMR 8205 2 allée Kepler, F-77420 Champs-sur-Marne, France.

Published: July 2011

Using numerical simulations, we perform an extensive finite-size analysis of the transverse diffusion coefficient in a sheared 2D amorphous solid over a broad range of strain rates at temperatures up to the supercooled liquid regime. We thus obtain direct qualitative evidence for the persistence of correlations between elementary plastic events up to the vicinity of the glass transition temperature T(g). A quantitative analysis of the data, combined with a previous study of the T and γ dependence of the macroscopic stress [Phys. Rev. Lett. 105, 266001 (2010)], leads us to conclude that the average avalanche size remains essentially unaffected by temperature up to T ~ 0.75T(g).

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http://dx.doi.org/10.1103/PhysRevE.84.011501DOI Listing

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