Statistics of the catastrophic slip events in the Portevin-Le Chĝtelier effect

M. A. Lebyodkin, Y. Brechet, Y. Estrin, L. P. Kubin

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Abstract

The statistics of catastrophic slip associated with discontinuous yielding (the Portevin-Le Chĝtelier effect) is investigated on an Al-Mg alloy. It is shown that a peaked distribution of stress drops changes towards a monotonic one, characterized by a power law with an exponent of -1.1, with increasing temperature and rate of straining. A model describing this behavior is studied, and it is suggested that there exists a formal similarity of the governing equations with those describing instabilities in frictional sliding. The use of discontinuous yielding in a tensile Al-Mg specimen is proposed as a candidate for modeling of earthquake statistics on a crustal fault.

Original languageEnglish
Pages (from-to)4758-4761
Number of pages4
JournalPhysical Review Letters
Volume74
Issue number23
DOIs
Publication statusPublished - 1995
Externally publishedYes

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