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Spatio-temporal features of the Portevin-Le Chatelier effect

✍ Scribed by G. Ananthakrishna

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 259 KB
Volume: 400-401
Category: Article
ISSN: 0921-5093
DOI: 10.1016/j.msea.2005.03.037

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✦ Synopsis

We show that an extension of Ananthakrishna's (AK) model exhibits all the features of the Portevin-Le Chatelier (PLC) effect including the recently observed crossover from a low dimensional chaotic state at low and medium strain rates to a high dimensional power law state of stress drops at high strain rates. The model also displays three types of bands. The dislocation configurations are shown to be in the pinned stated in the chaotic regime (i.e., the region of type C and B bands) and at the edge of unpinning in the power law regime where propagating bands are seen.

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