Modeling of mechanical response of NiTi shape memory alloy subjected to combined thermal and non-proportional mechanical loading: A case study on helical spring actuator

0461701 - ÚT 2017 RIV US eng J - Journal Article
Frost, Miroslav - Sedlák, Petr - Kadeřávek, Lukáš - Heller, Luděk - Šittner, Petr
Modeling of mechanical response of NiTi shape memory alloy subjected to combined thermal and non-proportional mechanical loading: A case study on helical spring actuator.
Journal of Intelligent Material Systems and Structures. Roč. 27, č. 14 (2016), s. 1927-1938. ISSN 1045-389X. E-ISSN 1530-8138
R&D Projects: GA ČR(CZ) GP14-28306P; GA ČR GA14-15264S; GA ČR GAP107/12/0800
Institutional support: RVO:61388998 ; RVO:68378271
Keywords : shape memory alloys * R-phase * modeling * elastic anisotropy * helical spring
Subject RIV: BM - Solid Matter Physics ; Magnetism; BM - Solid Matter Physics ; Magnetism (FZU-D)
Impact factor: 2.255, year: 2016
http://jim.sagepub.com/content/27/14/1927.full.pdf

In this work, a constitutive model tailored for nonproportional multi-axial loading of NiTi SMA exhibiting two-stage phase transformation via R-phase is enhanced so that the anisotropy of martensitic structure is captured. Numerical simulations of the mechanical response of a NiTi SMA helical spring subjected to thermal cycling at a constant applied force are performed and compared with experimental data. Simulations provide detailed information on the evolution of distributions of phase fractions and stress within a cross-section of the wire forming the spring.
Permanent Link: http://hdl.handle.net/11104/0261318