Mechanical behaviour and phase transition mechanisms of a shape memory alloy by means of a novel analytical model

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Abstract

The aim of the present paper is to examine both the fatigue behaviour and the phase transition mechanisms of an equiatomic pseudo-elastic NiTi Shape Memory Alloy through cyclic tests (up to 100 loading cycles). More precisely, miniaturised dog-bone specimens are tested by using a customised testing machine and the contents of both austenite and martensite phase are experimentally measured by means of X-Ray diffraction (XRD) analyses. On the basis of such experimental results in terms of martensite content, an analytical model is here formulated to correlate the stress-strain relationship to the phase transition mechanisms. Finally, a validation of the present model by means of experimental data pertaining the stress-strain relationship is performed.

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Carpinteri, A., Di Cocco, V., Fortese, G., Iacoviello, F., Natali, S., Ronchei, C., … Zanichelli, A. (2018). Mechanical behaviour and phase transition mechanisms of a shape memory alloy by means of a novel analytical model. Acta Mechanica et Automatica, 12(2), 105–108. https://doi.org/10.2478/ama-2018-0017

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