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- W3025707944 abstract "We study theoretically the yielding of sheared amorphous materials as a function of increasing levels of initial sample annealing prior to shear, in three widely used constitutive models and three widely studied annealing protocols. In thermal systems we find a gradual progression, with increasing annealing, from smoothly ``ductile'' yielding, in which the sample remains homogeneous, to abruptly ``brittle'' yielding, in which it becomes strongly shear banded. This progression arises from an increase with annealing in the size of an overshoot in the underlying stress-strain curve for homogeneous shear, which causes a shear banding instability that becomes more severe with increasing annealing. Ductile and brittle yielding thereby emerge as two limiting cases of a continuum of yielding transitions, from gradual to catastrophic. In contrast, athermal systems with a stress overshoot always show brittle yielding at low shear rates, however small the overshoot." @default.
- W3025707944 created "2020-05-21" @default.
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- W3025707944 date "2020-10-15" @default.
- W3025707944 modified "2023-10-11" @default.
- W3025707944 title "Ductile and Brittle Yielding in Thermal and Athermal Amorphous Materials" @default.
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- W3025707944 doi "https://doi.org/10.1103/physrevlett.125.168003" @default.
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