Mechanical Behaviour and Phase Transition Mechanisms of a Shape Memory Alloy by Means of a Novel Analytical Model

Andrea Carpinteri, Vittorio Di Cocco, Giovanni Fortese, Francesco Iacoviello, Stefano Natali, Camilla Ronchei, Daniela Scorza, Sabrina Vantadori, Andrea Zanichelli
2018 Acta Mechanica et Automatica  
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
more » ... te 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.
doi:10.2478/ama-2018-0017 fatcat:wjksjdkkknbdpkhcl2kdsegipq