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We study propagating mode-I fracture in two dimensional amorphous materialsusing atomistic simulations. We used the continuous random network (CRN) modelof an amorphous material, creating samples using a two dimensional analogue ofthe WWW (Wooten, Winer & Weaire) Monte-Carlo algorithm. For modeling fracture,molecular-dynamics simulations were run on the resulting samples. The resultsof our simulations reproduce the main experimental features. In addition toachieving a steady-state crack under a constant driving displacement (which hadnot yet been achieved by other atomistic models for amorphous materials), theruns show micro-branching, which increases with driving, transitioning tomacro-branching for the largest drivings. Beside the qualitative visualsimilarity of the simulated cracks to experiment, the simulation also succeedsin explaining the experimentally observed oscillations of the crack velocity.

Propagating mode-I fracture in amorphous materials using the continuous random network (CRN) model