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Understanding, predicting and eventually improving the resistance to fractureof silicate materials is of primary importance to design new glasses that wouldbe tougher, while retaining their transparency. However, the atomic mechanismof the fracture in amorphous silicate materials is still a topic of debate. Inparticular, there is some controversy about the existence of ductility at thenano-scale during the crack propagation. Here, we present simulations of thefracture of three archetypical silicate glasses using molecular dynamics. Weshow that the methodology that is used provide realistic values of fractureenergy and toughness. In addition, the simulations clearly suggest thatsilicate glasses can show different degrees of ductility, depending on theircomposition.

Fracture Toughness of Silicate Glasses: Insights from Molecular Dynamics Simulations