Experimental and computational study on phase transformations in superelastic NiTi snake-like spring

0494577 - FZÚ 2019 RIV GB eng J - Článek v odborném periodiku
Frost, M. - Sedlak, P. - Heller, Luděk - Kadeřávek, Lukáš - Šittner, Petr
Experimental and computational study on phase transformations in superelastic NiTi snake-like spring.
Smart Materials and Structures. Roč. 27, č. 9 (2018), s. 1-10, č. článku 095005. ISSN 0964-1726. E-ISSN 1361-665X
Grant CEP: GA ČR GA18-03834S
Institucionální podpora: RVO:68378271
Klíčová slova: NiTi * in situ x-ray diffraction * modeling * snake-like spring * localization
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.543, rok: 2018

One of the major drawbacks of mechanically loaded superelastic NiTi structures is their short fatigue life, which is believed to be related to cyclic variation of relatively large strains due to martensitic phase transformation. Thus, determination of spatial and temporal evolution of martensite within such structures may help to avoid critical loading scenarios in practical applications. However, required data are often difficult to obtain and interpret. In this study, we present a possible approach to this issue and illustrate it on a comprehensive study on isothermal stretching of a planar superelastic NiTi snake-like spring, a prospective versatile superelastic actuator element. Specifically, we complement mechanical, electrical resistivity and x-ray diffraction methods with finite element simulations employing a progressive macroscopic constitutive model and reconstruct the spatial distribution in the most strained parts of the spring.
Trvalý link: http://hdl.handle.net/11104/0287678