Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7196200 | Theoretical and Applied Fracture Mechanics | 2018 | 42 Pages |
Abstract
In the present paper, the fatigue behaviour of a near-equiatomic pseudo-elastic NiTi SMA (Shape Memory Alloy) is experimentally examined by means of tensile cyclic loading tests. In situ X-ray Diffraction (XRD) analyses are also performed in order to measure the contents of both austenite and martensite phase during testing. The experimental campaign highlights a stress-strain diagram defined through five different stress-strain functions. Such a diagram is here proposed to be analytically described by a model in two steps: (i) firstly, the domain for each of the above functions is determined by exploiting the experimental measurements of both austenite and martensite phase content; (ii) then, the equations defining each function are deduced by assuming that the fatigued material behaves as a single-spring system or a two-spring system (working in parallel or in series).
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Authors
Sabrina Vantadori, Andrea Carpinteri, Vittorio Di Cocco, Francesco Iacoviello, Stefano Natali,