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

0494660 - ÚT 2019 RIV GB eng J - Journal Article
Frost, Miroslav - Sedlák, Petr - Heller, L. - Kadeřávek, L. - Šittner, P.
Experimental and computational study on phase transformations in superelastic NiTi snake-like spring.
Smart Materials and Structures. Roč. 27, č. 9 (2018), č. článku 095005. ISSN 0964-1726. E-ISSN 1361-665X
R&D Projects: GA ČR GA18-03834S
Institutional support: RVO:61388998
Keywords : NiTi * in situ x-ray diffraction * modeling * snake-like spring * localization
OECD category: Materials engineering
Impact factor: 3.543, year: 2018
http://iopscience.iop.org/article/10.1088/1361-665X/aacca4/meta

In this study, we present a comprehensive study on isothermal stretching of a planar superelastic NiTi snake-like spring, a prospective versatile superelastic actuator element. 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. We reveal that martensite tends to form in a localized manner there, which affects distribution of phases as well as strains along the spring. Results also exemplify the substantial influence of tension-compression asymmetry of the superelastic response to distribution of phases within cross-section of a bent structure.
Permanent Link: http://hdl.handle.net/11104/0287950