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Crossover in the dynamics of Portevin–Le Chatelier effect from chaos to SOC

Ananthakrishna, G and Noronha, SJ and Fressengeas, C and Kubin, LP (2001) Crossover in the dynamics of Portevin–Le Chatelier effect from chaos to SOC. In: Materials Science and Engineering A, 309-31 . pp. 316-319.

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Abstract

We demonstrate the existence of a crossover in the dynamics of the PLC effect from chaotic to self-organized critical nature by analysing the stress–strain curves obtained from single crystals of Al–10%Cu subjected to three levels of constant strain rate deformation. At the lowest and intermediate strain rates, we provide an unambiguous support for the existence of a chaotic regime. For these two strain rates, the distributions of stress drops are peaked. At the highest strain rate, we find that the distributions of stress drops and their durations exhibit a power law behaviour reminiscent of a self-organized critical state. We also show that scaling relations are obeyed by the various exponents.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Portevin–Le Chatelier effect;SOC;Stress–strain curves;Chaos
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 02 Apr 2007
Last Modified: 19 Sep 2010 04:37
URI: http://eprints.iisc.ernet.in/id/eprint/10594

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