1/f noise and avalanche scaling in plastic deformation.
We study the intermittency and noise of dislocation systems undergoing shear deformation. Simulations of a simple two-dimensional discrete dislocation dynamics model indicate that the deformation rate exhibits a power spectrum scaling of the type 1/falpha. The noise exponent is far away from a Lorentzian, with alpha approximately 1.5. This result is directly related to the way the durations of avalanches of plastic deformation activity scale with their size.
Laurson
L
L
Laboratory of Physics, Helsinki University of Technology, P. O. Box 1100, FIN-02015 HUT, Finland.
Alava
M J
MJ