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- W2247805969 abstract "連絡教員 物性物理学専攻 大熊 哲(内線 3252) Despite its importance for basic science and industry, the physical process that causes a solid to change its shape permanently under external deformation is still not well understood. Here we use molecular dynamics simulations of amorphous solids under oscillatory shear to study this phenomenon, and show that at a critical strain amplitude, the size of the cooperative atomic motion that allows for a permanent deformation diverges. We compare this non-equilibrium critical behavior to that of a front depinning transition. This viewpoint, based on fluctuations and statistics, is complementary to the dynamical to chaos which was previously identified at the same strain amplitude. Below this irreversibile-depinning transition, we observe large avalanches which are completely repetitive with each shear strain cycle. This suggests that while avalanches on their own do not cause irreversible deformation, it is likely that the irreversibility transition and the depinning-like transition are two aspects of the same phenomena. One implication is that the transition could be detected before the onset of irreversible flow by an analysis of the power spectra of avalanches. We also discuss how this work relates to the nonequilibrium reversible-irreversible transitions studied in recent experiments on periodically sheared colloidal systems, periodically driven vortices in type-II superconductors, and nonequilibrium absorbing phase transitions. Work done in collaboration with Ido Regev, Karin Dahmen, John Weber, and Turab Lookman [1]" @default.
- W2247805969 created "2016-06-24" @default.
- W2247805969 creator A5010373913 @default.
- W2247805969 date "2015-03-04" @default.
- W2247805969 modified "2023-09-23" @default.
- W2247805969 title "Reversible Avalanches and Criticality in Amorphous Solids" @default.
- W2247805969 hasPublicationYear "2015" @default.
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