Abstract
A strange self-sustained oscillation in plastic uniaxial tension of various materials is called the Portevin Le Chatelier (PLC) effect. In modelling PLC dynamic strain aging is the common way of explanation. It is based mainly on dislocation dynamics. Experimental studies show the negative strain rate dependence (NRS) is always present at PLC. By using continuum mechanics and dynamical systems theory we find that NRS is the essential reason of it.
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