Residual Stress Heterogeneity Controls Mechanical Stability in Isodense Amorphous Silica
DOI:
https://doi.org/10.33003/fjorae.2024.0102.86Keywords:
Amorphous SiO₂, Residual internal stress, Mechanical stability, Molecular dynamics simulation, Pressure-induced densificationAbstract
Residual internal stress is widely recognized as a consequence of glass processing, yet its independent role in controlling the mechanical stability of amorphous SiO₂ remains unclear. Here, molecular dynamics simulations were used to investigate whether residual stress governs deformation in cold- and hot-compressed silica glasses with nearly identical recovered densities. Glasses prepared from paired parent configurations were matched within 0.5% in density, and their residual stress fields were characterized using hydrostatic, deviatoric, and spatial correlation analyses. Mechanical stability was evaluated through athermal quasistatic shear, uniaxial tension, and non-affine displacement analysis. Despite their similar densities, cold-compressed glasses exhibited broader residual stress distributions, approximately 60% higher hydrostatic stress variance, and a 78% longer stress-correlation length than hot-compressed glasses. High-stress regions preferentially nucleated irreversible atomic rearrangements, and incorporating residual stress significantly improved the prediction of mechanically active regions beyond conventional structural descriptors. Fixed-density stress-relief annealing reduced stress heterogeneity and increased yield strength while delaying irreversible deformation without appreciably altering the network topology. These findings identify residual stress heterogeneity as a preparation-dependent state variable governing the mechanical stability of amorphous SiO₂ beyond recovered density.
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