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- W3092321966 abstract "We construct a mean-field elastoplastic description of the dynamics of amorphous solids under arbitrary time-dependent perturbations, building on the work of Lin and Wyart [Phys. Rev. X 6, 011005 (2016)] for steady shear. Local stresses are driven by power-law distributed mechanical noise from yield events throughout the material, in contrast to the well-studied H'{e}braud-Lequeux model where the noise is Gaussian. We first use a mapping to a mean first passage time problem to study the phase diagram in the absence of shear, which shows a transition between an arrested and a fluid state. We then introduce a boundary layer scaling technique for low yield rate regimes, which we first apply to study the scaling of the steady state yield rate on approaching the arrest transition. These scalings are further developed to study the aging behaviour in the glassy regime, for different values of the exponent $mu$ characterizing the mechanical noise spectrum. We find that the yield rate decays as a power-law for $1<mu<2$, a stretched exponential for $mu=1$ and an exponential for $mu<1$, reflecting the relative importance of far-field and near-field events as the range of the stress propagator is varied. Comparison of the mean-field predictions with aging simulations of a lattice elastoplastic model shows excellent quantitative agreement, up to a simple rescaling of time." @default.
- W3092321966 created "2020-10-15" @default.
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- W3092321966 date "2020-12-01" @default.
- W3092321966 modified "2023-09-27" @default.
- W3092321966 title "Aging in a mean field elastoplastic model of amorphous solids" @default.
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- W3092321966 doi "https://doi.org/10.1063/5.0033196" @default.
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