RESEARCH PAPER
Mechanical Behaviour and Phase Transition Mechanisms of a Shape Memory Alloy by Means of a Novel Analytical Model
1
Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy
2
Department of Civil and Mechanical Engineering, University of Cassino and Lazio Meridionale, Via G. Di Biasio 43, 03043 Cassino (FR), Italy
3
Department Chemical Engineering Materials Environment, University of Roma “La Sapienza”, via Eudossiana 18, 00184 , Rome, Italy
Submission date: 2017-04-19
Acceptance date: 2018-06-08
Online publication date: 2018-07-17
Publication date: 2018-06-01
Acta Mechanica et Automatica 2018;12(2):105-108
KEYWORDS
Fatigue BehaviourPhase Transition MechanismsShape Memory AlloyTensile Cyclic TestX-Ray Diffraction Analyses
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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| eISSN: | 2300-5319 |
| ISSN: | 1898-4088 |
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