Multifractal burst in the spatiotemporal dynamics of Jerky flow

Bharathi, M. S. ; Lebyodkin, M. ; Ananthakrishna, G. ; Fressengeas, C. ; Kubin, L. P. (2001) Multifractal burst in the spatiotemporal dynamics of Jerky flow Physical Review Letters, 87 (16). 165508_1-165508_4. ISSN 0031-9007

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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 spatiotemporal 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.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:71995
Deposited On:28 Nov 2011 05:16
Last Modified:28 Nov 2011 05:16

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