Plastic response and correlations in athermally sheared amorphous solids

Abstract

The onset of irreversible deformation in low-temperature amorphous solids is due to the accumulation of elementary events, consisting of spacially and temporally localized atomic rearrangements involving only a few tens of atoms. Recently, numerical and experimental work addressed the issue of spatio-temporal correlations between these plastic events. Here, we provide further insight into these correlations by investigating, via molecular dynamics (MD) simulations, the plastic response of a two-dimensional amorphous solid to artificially triggered local shear transformations. We show that while the plastic response is virtually absent in as-quenched configurations, it becomes apparent if a shear strain was previously imposed on the system. Plastic response has a four-fold symmetry which is characteristic of the shear stress redistribution following the local transformation. At high shear rate we report evidence for a fluctuation-dissipation relation, connecting plastic response and correlation, which seems to break down if lower shear rates are considered.

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• Low-temperature anomalies of a vapor deposited glass
• Contribution to Viscosity from the Structural Relaxation via the Atomic Scale Green-Kubo Stress Correlation Function
• Mechanical excitation and marginal triggering during avalanches in sheared amorphous solids
• Yielding of a Model Glassformer: an Interpretation with an Effective System of Icosahedra