Controlling Strain Bursts and Avalanches at the Nano- to Micrometer Scale

Yinan Cui, Giacomo Po, Nasr Ghoniem

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

We demonstrate, through three-dimensional discrete dislocation dynamics simulations, that the complex dynamical response of nano- and microcrystals to external constraints can be tuned. Under load rate control, strain bursts are shown to exhibit scale-free avalanche statistics, similar to critical phenomena in many physical systems. For the other extreme of displacement rate control, strain burst response transitions to quasiperiodic oscillations, similar to stick-slip earthquakes. External load mode control is shown to enable a qualitative transition in the complex collective dynamics of dislocations from self-organized criticality to quasiperiodic oscillations.

Original languageEnglish (US)
Article number155502
JournalPhysical Review Letters
Volume117
Issue number15
DOIs
StatePublished - Oct 7 2016
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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