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Article
Avalanches and Scaling in Plastic Deformation
Physical Review Letters (2004)
  • Marisol Koslowski, Los Alamos National Laboratory
  • Richard Alan Lesar, Los Alamos National Laboratory
  • Robb Thomson, Los Alamos National Laboratory
Abstract
Plastic deformation of crystalline materials is a complex nonhomogeneous process characterized by avalanches in the motion of dislocations. We study the evolution of dislocation loops using an analytically solvable phase-field model of dislocations for ductile single crystals during monotonic loading. The distribution of dislocation loop sizes is given by P(A)∼A−σ, with σ=1.8±0.1. The exponent is in agreement with those found in acoustic emission experiments. This model also predicts a range of macroscopic behaviors in agreement with observation, including hardening with monotonic loading, and a maximum in the acoustic emission signal at the onset of yielding.
Publication Date
September 14, 2004
Citation Information
Marisol Koslowski, Richard Alan Lesar and Robb Thomson. "Avalanches and Scaling in Plastic Deformation" Physical Review Letters Vol. 93 Iss. 125502 (2004)
Available at: http://works.bepress.com/richard_lesar/5/