Determination of the universality class of crystal plasticity
Department of Physics, University of Illinois at Urbana-Champaign, Loomis Laboratory of Physics 1110 West Green Street, Urbana, IL, 61801-3080, USA
Received: 4 December 2012
Accepted: 8 January 2013
Although scaling phenomena have long been documented in crystalline plasticity, the universality class has been difficult to identify due to the rarity of avalanche events, which require large system sizes and long times in order to accurately measure scaling exponents and functions. Here we present comprehensive simulations of two-dimensional dislocation dynamics under shear, using finite-size scaling to extract scaling exponents and the avalanche profile scaling function from time-resolved measurements of slip avalanches. Our results provide compelling evidence that both the static and dynamic universality classes are consistent with the mean-field interface depinning model.
PACS: 61.72.Ff – Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.) / 62.20.fq – Plasticity and superplasticity / 64.60.av – Cracks, sandpiles, avalanches, and earthquakes
© EPLA, 2013