Vibrational modes identify soft spots in a sheared disordered packing.

By M. Manning, A. J. Liu. 2010

356 citations recorded by the source corpus.

We analyze low-frequency vibrational modes in a two-dimensional, zero-temperature, quasistatically sheared model glass to identify a population of structural "soft spots" where particle rearrangements are initiated. The population of spots evolves slowly compared to the interval between particle rearrangements, and the soft spots are structurally different from the rest of the system. Our results suggest that disordered solids flow via localized rearrangements that tend to occur at soft spots, which are analogous to dislocations in crystalline solids.

Subfields: Electrical and Electronic Engineering, Mechanical Engineering, Mechanics of Materials

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In Mechanical Engineering

In Mechanics of Materials

Citations in the corpus

Deformation of metallic glasses: Recent developments in theory, simulations, and experiments (2016, unknown): “Regions containing such atoms have been denoted “soft spots” and they appear to persist on order of the a relaxation time of the sheared system, surviving multiple transitions in their vicinity [98,99].”
Motility-driven glass and jamming transitions in biological tissues (2015, background): “However, a partial answer comes from recent work in disordered particulate matter showing that low-frequency normal modes do have significantly lower energy barriers [30, 61] than higher frequency normal modes.”
Deformation and flow of amorphous solids: Insights from elastoplastic models (2017, background): “This holds true at zero temperature (Manning and Liu, 2011) and also for metallic and polymer glasses (Smessaert and Rottler, 2015) (see Fig.”
The role of local structure in dynamical arrest (2014, background): “[130] S. Ding, Y. Liu, Y. Li, Z. Liu, S. Sohn, F. J. Walker, and J. Schroers.”
Erratum: On variational arguments for vibrational modes near jamming (2016, background): “They also contribute to non-linear properties such as thermal activation [8, 9] and plasticity [10].”