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We use large-scale simulations to investigate the dynamic fracture of silicaand sodium-silicate glasses under uniaxial tension. The stress-strain curvesdemonstrate that silica glass is brittle whereas the glasses rich in Na showpronounced ductility. A strong composition dependence is also seen in the crackvelocity which is on the order of 1800 m/s for glasses with low Naconcentration and decreases to 700 m/s if the concentration is high. We findthat during the fracture of Na-rich glasses very irregular cavities as large as3-4 nm form ahead of the crack front, indicating the presence of nanoductilityin these glasses. Before fracture occurs, the local composition, structure, andmechanical properties are heterogeneous in space and show a strong dependenceon the applied strain. Further analysis of the correlations between these localproperties allows to obtain a better microscopic understanding of thedeformation and fracture of glasses and how the local heating close to thecrack tip, up to several hundred degrees, permits the structure to relax.

Fracture of silicate glasses: Micro-cavities and correlations between atomic-level properties