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In this contribution, we investigate the fundamental mechanism of plasticityin a model two-dimensional network glass. The glass is generated by using aMonte Carlo bond-switching algorithm and subjected to athermal simple sheardeformation, followed by subsequent unloading at selected deformation states.This enables us to investigate the topological origin of reversible andirreversible atomic-scale rearrangements. It is shown that some events that aretriggered during loading recover during unloading, while some do not. Thus, twokinds of elementary plastic events are observed, which can be linked to thenetwork topology of the model glass.

Origin of reversible and irreversible atomic-scale rearrangements in a model two-dimensional network glass