Multifractal burst in the spatio-temporal dynamics of jerky flow

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.

4 pages, 6 figures To be published in Phys. Rev. Lett. (2001)

References in corpus (1)

• Critical Dynamics of Burst Instabilities in the Portevin-Le Chatelier Effect

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