In order to understand the phenomenon of reversible plasticity exhibited by shape memoryalloys and other smart materials, we study an elementary prototypical model. Building on anoriginal idea of M¨uller and Villaggio [17], we consider an inhomogeneous ensemble of bi-stableelements connected in series and loaded in a soft device. To interpret the fine structure of thehysteresis loops observed experimentally, we assume that the dynamics is maximally dissipativeand investigate different evolutionary strategies for a “driven” system with external forcechanging quasi-statically. Our main result is that the inhomogeneity of the elastic propertiesleads to a distinctive hardening with serrations of a Portevin-Le Chatelier type and producesa realistic memory structure characterized by the “congruency” and “return point memory”properties

A mechanism of transformational plasticity

Puglisi G;
2002

Abstract

In order to understand the phenomenon of reversible plasticity exhibited by shape memoryalloys and other smart materials, we study an elementary prototypical model. Building on anoriginal idea of M¨uller and Villaggio [17], we consider an inhomogeneous ensemble of bi-stableelements connected in series and loaded in a soft device. To interpret the fine structure of thehysteresis loops observed experimentally, we assume that the dynamics is maximally dissipativeand investigate different evolutionary strategies for a “driven” system with external forcechanging quasi-statically. Our main result is that the inhomogeneity of the elastic propertiesleads to a distinctive hardening with serrations of a Portevin-Le Chatelier type and producesa realistic memory structure characterized by the “congruency” and “return point memory”properties
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11589/10355
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