Abstract
The stress-strain isothermal hysteresis loops due to the incomplete martensitic transformation are analysed for Ti-Ni shape memory alloys. Experiments show the existence of two distinct yield lines for phase transition; one for the forward transformation austenite→martensite (A→M), the other for the reverse transformation M→A. The tensile behaviour of single crystals with only one yield line (A↔M) [1] can be considered as an ‘ideal’ case. An extension of a thermodynamic model for pseudoelasticity [2] allows these two yield lines to be taken into account.
Sommario
Per leghe Ti-Ni con memoria di forma vengono analizzati i cicli di isteresi isotermici tensione-deformazione prodotti da una incompleta trasformazione martensitica. Gli esperimenti mostrano l'esistenza di due distinte linee di snervamento per la transizione di fase, una verso la trasformazione austenite→martensite (A→M), l'altra per la trasformazione inversa M→A. Il comportamento a trazione di un singolo cristallo con una sola linea di snervamento (A↔M) [1], può essere considerato un caso ideale. L'estensione ad un modello termodinamico pseudo-elastico [2] consente di analizzare queste due linee di snervamento.
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Lexcellent, C., Tobushi, H. Internal loops in pseudoelastic behaviour of Ti-Ni shape memory alloys: Experiment and modelling. Meccanica 30, 459–466 (1995). https://doi.org/10.1007/BF01557078
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DOI: https://doi.org/10.1007/BF01557078