Comparison of yielding behaviour in model network and atomic glasses*

Yielding in a model atomic glass (Kob-Andersen binary mixture) has been studied recently through athermal quasi-static shear deformations [1], revealing a sharp yielding transition accompanied by strain localisation [2]. We investigate the manner in which such a transition is manifested in a model network glass, the BKS model of silica [3]. Silica exhibits a fragile-to-strong cross over a function of temperature, and we investigate the manner in which yielding and the accompanying strain localisation differs in glasses prepared initially in the strong and fragile regimes. We find qualitative differences in the yielding behaviour, and in the details of structural changes accompanying yielding. We compare these results to the aforementioned atomic glass with comparable changes in the degree of annealing, and recent results regarding the effect of annealing in the yielding behaviour of glasses [4].
References:

[1] P. Leishangthem, A. D. S. Parmar, and S. Sastry, Nature Communications 8, 14653 (2017)

[2] A. D. S. Parmar, S. Kumar, and S. Sastry, Phys. Rev. X 9, 021018 (2019)

[3] I. Saika-Voivod, F. Sciortino, and P. H. Poole, Phys. Rev. E 69, 041503 (2004)

[4] M. Ozawa et al. PNAS 115, 6656 (2018).