Fatigue performance of superelastic NiTi near stress-induced martensitic transformation

0473793 - FZÚ 2018 RIV GB eng J - Journal Article
Alarcón Tarquino, Eduardo - Heller, Luděk - Chirani, S.A. - Šittner, Petr - Kopeček, Jaromír - Saint-Sulpice, L. - Calloch, S.
Fatigue performance of superelastic NiTi near stress-induced martensitic transformation.
International Journal of Fatigue. Roč. 95, Feb (2017), s. 76-89. ISSN 0142-1123. E-ISSN 1879-3452
R&D Projects: GA ČR GB14-36566G; GA MŠMT LO1409; GA MŠMT LM2015088; GA ČR GA16-20264S; GA ČR GA14-15264S
Grant - others:FUNBIO(XE) CZ.2.16/3.1.00/21568
Institutional support: RVO:68378271
Keywords : shape-memory alloys * Nitinol * superelasticity * martensitic transformation * shape memory alloys * fatigue
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.132, year: 2017

The structural fatigue of superelastic NiTi was studied with special attention paid to the drop in fatigue performance commonly observed at the onset of the stress-induced martensitic transformation. We processed the superelastic NiTi wires into an hourglass shape as a result of which the stress induced martensitic transformation in tension is not localized as confirmed by digital image correlation measurements. The hourglass shaped samples were subjected to force controlled pull-pull fatigue tests at two distinct temperatures selected to investigate the fatigue of NiTi with and without the R-phase transformation involved, and to capture the effect of varying critical stress for the onset of B19' martensitic transformation. Resulting fatigue curves expressed in terms of both the stress and the strain show a first degradation of fatigue performance at stresses more than 200 MPa below the onset of the martensitic transformation.
Permanent Link: http://hdl.handle.net/11104/0270929