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Random critical point separates brittle and ductile yielding transitions in amorphous materials [Physics]

Understanding how amorphous solids yield in response to external deformations is crucial both for practical applications and for theoretical reasons. Here we show that despite large differences in the materials’ microscopic interactions, a degree of universality emerges as there are only two ways in which amorphous solids respond to a deformation: One, typical of well-annealed materials, is characterized by an abrupt failure with a macroscopic stress drop and the sudden emergence of sharp shear bands; the other, typical of poorly annealed materials, shows merely a smooth crossover. By varying the preparation protocol, one can change the response of a given material from one to the other, and this change is controlled by a random critical point.

Autoren:   Misaki Ozawa; Ludovic Berthier; Giulio Biroli; Alberto Rosso; Gilles Tarjus
Journal:   Proceedings of the National Academy of Sciences current issue
Band:   115
Ausgabe:   26
Jahrgang:   2018
Seiten:   6656
DOI:   10.1073/pnas.1806156115
Erscheinungsdatum:   26.06.2018
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