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- W3011285239 abstract "Molecular dynamics (MD) simulations of fused silica glass deforming in pressure-shear, while revealing useful insights into processes unfolding at the atomic level, fail spectacularly in that they grossly overestimate the magnitude of the stresses relative to those observed, e. g., in plate-impact experiments. We interpret this gap as evidence of relaxation mechanisms that operate at mesoscopic lengthscales and which, therefore, are not taken into account in atomic-level calculations. We specifically hypothesize that the dominant mesoscopic relaxation mechanism is shear banding. We evaluate this hypothesis by first generating MD data over the relevant range of temperature and strain rate and then carrying out continuum shear-banding calculations in a plate-impact configuration using a critical-state plasticity model fitted to the MD data. The main outcome of the analysis is a knock-down factor due to shear banding that effectively brings the predicted level of stress into alignment with experimental observation, thus resolving the predictive gap of MD calculations." @default.
- W3011285239 created "2020-03-23" @default.
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- W3011285239 date "2020-07-01" @default.
- W3011285239 modified "2023-10-14" @default.
- W3011285239 title "Shear localization as a mesoscopic stress-relaxation mechanism in fused silica glass at high strain rates" @default.
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- W3011285239 doi "https://doi.org/10.1016/j.jmps.2020.103940" @default.
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