Transient heat transfer effects on the pseudoelastic behavior of shape-memory wires

P. H. Leo, T. W. Shield, O. P. Bruno

Research output: Contribution to journalArticle

191 Citations (Scopus)

Abstract

Experimental results of a displacement-controlled elongation of a shape-memory wire of nickel-titanium are presented. It is observed that the hysteretic strain-stress curves depend strongly on the strain rates at which the wire is extended. A theoretical model is proposed to explain this phenomenon. This model couples the fully time-dependent heat transfer in the wire to its quasi-static mechanical behavior through the temperature dependence of the transformation stress of the alloy. It accounts quantitatively for experimentally observed changes in the pseudoelastic hysteresis. The model presented here is different from others proposed in the literature, as it does not make use of a kinetic relation and accounts for the observed changes in the pseudoelastic hysteresis without parameter fitting. The results show that a model consisting of a single moving austenite-martensite interface is sufficient to predict the response of the wire over several decades of strain rate.

Original languageEnglish (US)
Pages (from-to)2477-2485
Number of pages9
JournalActa Metallurgica Et Materialia
Volume41
Issue number8
DOIs
StatePublished - Aug 1993

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Shape memory effect
Wire
Heat transfer
Hysteresis
Strain rate
Stress-strain curves
Martensite
Austenite
Elongation
Titanium
Nickel
Kinetics
Temperature

Cite this

Transient heat transfer effects on the pseudoelastic behavior of shape-memory wires. / Leo, P. H.; Shield, T. W.; Bruno, O. P.

In: Acta Metallurgica Et Materialia, Vol. 41, No. 8, 08.1993, p. 2477-2485.

Research output: Contribution to journalArticle

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