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Mechanical rejuvenation and over-aging of glasses is investigated throughstochastic simulations of the soft glassy rheology (SGR) model. Strain- andstress-controlled deformation cycles for a wide range of loading conditions areanalyzed and compared to molecular dynamics simulations of a model polymerglass. Results indicate that deformation causes predominantly rejuvenation,whereas over-aging occurs only at very low temperature, small strains, and forhigh initial energy states. Although the creep compliance in the SGR modelexhibits full aging independent of applied load, large stresses in thenonlinear creep regime cause configurational changes leading to rejuvenation ofthe relaxation time spectrum probed after a stress cycle. During recovery,however, the rejuvenated state rapidly returns to the original aging trajectorydue to collective relaxations of the internal strain.

Mechanical rejuvenation and over-aging in the soft glassy rheology model