Mechanical excitation and marginal triggering during avalanches in sheared amorphous solids
arXiv:2202.05721 · doi:10.1103/PhysRevE.107.034902
Abstract
We study plastic strain during individual avalanches in overdamped particle-scale molecular dynamics (MD) and meso-scale elasto-plastic models (EPM) for amorphous solids sheared in the athermal quasi-static limit. We show that the spatial correlations in plastic activity exhibit a short lengthscale that grows as in MD and ballistically in EPM, and 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.
References in corpus (35)
- Dynamics of Viscoplastic Deformation in Amorphous Solids
- Crackling Noise
- Rheology of Soft Glassy Materials
- A random critical point separates brittle and ductile yielding transitions in amorphous materials
- Scaling description of the yielding transition in soft amorphous solids at zero temperature
- Bulk Metallic Glasses Deform via Slip Avalanches
- Scaling exponents for Barkhausen avalanches in polycrystals and amorphous ferromagnets
- Predicting plasticity in disordered solids from structural indicators
- Statistical Physics of the Yielding Transition in Amorphous Solids
- An extremal model for amorphous media plasticity
- Driving rate dependence of avalanche statistics and shapes at the yielding transition
- Avalanches in Strained Amorphous Solids: Does Inertia Destroy Critical Behavior?
- Avalanches, precursors and finite size fluctuations in a mesoscopic model of amorphous plasticity
- The effect of inertia on sheared disordered solids: Critical scaling of avalanches in two and three dimensions
- On the density of shear transformation zones in amorphous solids
- Avalanches and clusters in planar crack front propagation
- Universality of Avalanche Exponents in Plastic Deformation of Disordered Solids
- Avalanche localization and crossover scaling in amorphous plasticity
- Criticality in the approach to failure in amorphous solids
- Plastic response of a 2D amorphous solid to quasi-static shear : I - Transverse particle diffusion and phenomenology of dissipative events
- Time dependent elastic response to a local shear transformation in amorphous solids
- Strain localization and anisotropic correlations in a mesoscopic model of amorphous plasticity
- On the relevance of disorder in athermal amorphous materials under shear
- Inertia and universality of avalanche statistics: The case of slowly deformed amorphous solids
- Criticality in elastoplastic models of amorphous solids with stress-dependent yielding rates
- Spatial clustering of depinning avalanches in presence of long-range interactions
- Mechanical properties of simple computer glasses
- On the critical exponents of the yielding transition of amorphous solids
- Elastic consequences of a single plastic event: towards a realistic account of structural disorder and shear wave propagation in models of flowing amorphous solids
- Avalanches, thresholds, and diffusion in meso-scale amorphous plasticity
- Diffusion in mesoscopic lattice models of amorphous plasticity
- Criticality in sheared, disordered solids. I. Rate effects in stress and diffusion
- Plastic response and correlations in athermally sheared amorphous solids
- Mechanical signaling via nonlinear wavefront propagation in a mechanically-excitable medium
- Criticality in sheared, disordered solids. II. Correlations in avalanche dynamics