Multifractal burst in the spatio-temporal dynamics of jerky flow
Materials Science
2009-11-07 v1
Abstract
The collective behavior of dislocations in jerky flow is studied in Al-Mg polycrystalline samples subjected to constant strain rate tests. Complementary dynamical, statistical and multifractal analyses are carried out on the stress-time series recorded during jerky flow to characterize the distinct spatio-temporal dynamical regimes. It is shown that the hopping type B and the propagating type A bands correspond to chaotic and self-organized critical states respectively. The crossover between these types of bands is identified by a large spread in the multifractal spectrum. These results are interpreted on the basis of competing scales and mechanisms.
Keywords
Cite
@article{arxiv.cond-mat/0109189,
title = {Multifractal burst in the spatio-temporal dynamics of jerky flow},
author = {M. S. Bharathi and M. Lebyodkin and G. Ananthakrishna and C. Fressengeas and L. P. Kubin},
journal= {arXiv preprint arXiv:cond-mat/0109189},
year = {2009}
}
Comments
4 pages, 6 figures To be published in Phys. Rev. Lett. (2001)