Citation

Cui Y, Po G, Ghoniem N. Phys. Rev. Lett. 2016; 117(15): e155502.

Affiliation

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, 420 Westwood Plaza, Los Angeles, California 90095, USA.

Copyright

(Copyright © 2016, American Physical Society)

DOI

10.1103/PhysRevLett.117.155502

PMID

27768336

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.

Language: en