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We develop a mesoscopic model to study the plastic behavior of an amorphousmaterial under cyclic loading. The model is depinning-like and driven by adisordered thresholds dynamics which are coupled by long-range elasticinteractions. We propose a simple protocol of "glass preparation" which allowsus to mimic thermalisation at high temperature, as well as aging at vanishingtemperature. Various levels of glass stabilities (from brittle to ductile) canbe achieved by tuning the aging duration. The aged glasses are then immersedinto a quenched disorder landscape and serve as initial configurations forvarious protocols of mechanical loading by shearing. The dependence of theplastic behavior upon monotonous loading is recovered. The behavior undercyclic loading is studied for different ages and system sizes. The size and agedependence of the irreversibility transition is discussed. A thoroughcharacterization of the disorder-landscape is achieved through the analysis ofthe transition graphs, which describe the plastic deformation pathways underathermal quasi-static shear. In particular, the analysis of the stabilityranges of the strongly connected components of the transition graphs revealsthe emergence of a phase-separation like process associated with the aging ofthe glass. Increasing the age and hence stability of the initial glass, resultsin a gradual break-up of the landscape of dynamically accessible stable statesinto three distinct regions: one region centered around the initially preparedglass phase, and two additional regions, characterized by well-separated rangesof positive and negative plastic strains, each of which is accessible only fromthe initial glass phase by passing through the stress peak in the forward,respectively, backward shearing directions.

Mapping out the glassy landscape of a mesoscopic elastoplastic model