Mechanical excitation and marginal triggering during avalanches in sheared amorphous solids

D. Richard, A. Elgailani, D. Vandembroucq, M. L. Manning, C. E. Maloney

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We study plastic strain during individual avalanches in overdamped particle-scale molecular dynamics (MD) and mesoscale elastoplastic models (EPM) for amorphous solids sheared in the athermal quasistatic limit. We show that the spatial correlations in plastic activity exhibit a short length scale that grows as t3/4 in MD and ballistically in EPM, which is generated by mechanical excitation of nearby sites not necessarily close to their stability thresholds, and a longer lengthscale that grows diffusively for both models and is associated with remote marginally stable sites. These similarities in spatial correlations explain why simple EPMs accurately capture the size distribution of avalanches observed in MD, though the temporal profiles and dynamical critical exponents are quite different.

Original languageEnglish (US)
Article number034902
JournalPhysical Review E
Issue number3
StatePublished - Mar 2023

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics


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