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We predict a phenomenon of catastrophic material failure arising suddenlywithin an amorphous material, with an extremely long delay time since thematerial was last deformed. By simulating a mesoscopic soft glassy rheologymodel in one dimension (1D), a mesoscopic elastoplastic model in 1D and 2D, anda continuum fluidity model in 1D, we demonstrate the basic physics to involve adramatic ultra-delayed shear banding instability, in which strain suddenlystrongly localises within the material and the stress drops precipitously. Thedelay time after the long historical shear strain was applied before failureoccurs increases steeply with decreasing strain amplitude, decreasing workingtemperature, and increasing sample annealing prior to shear. In demonstratingthe same physics -- which is directly testable experimentally and in particlesimulations -- to obtain within three different constitutive models, we suggestit may be generic across amorphous materials. The counter-intuitive predictionof catastrophic material failure long after any deformation was last appliedcould have important consequences for material processing and performance.

Ultra-delayed material failure via shear banding after straining an amorphous material