Experimentally validated constitutive model for NiTi-based shape memory alloys featuring intermediate R-phase transformation: A case study of Ni48Ti49Fe3

0542751 - ÚT 2022 RIV GB eng J - Journal Article
Frost, Miroslav - Jury, Antoine - Heller, Luděk - Sedlák, Petr
Experimentally validated constitutive model for NiTi-based shape memory alloys featuring intermediate R-phase transformation: A case study of Ni48Ti49Fe3.
Materials and Design. Roč. 203, May (2021), č. článku 109593. ISSN 0264-1275. E-ISSN 1873-4197
R&D Projects: GA ČR GA18-03834S
Institutional support: RVO:61388998 ; RVO:68378271
Keywords : NiTiFe shape memory alloys * R-phase * constitutive model * finite element analysis
OECD category: Applied mechanics; Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Impact factor: 9.417, year: 2021
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0264127521001465/pdfft?isDTMRedir=true&download=true

An important group of NiTi-based alloys employed in applications exhibits an intermediate R-phase transformation, which substantially modifies the material's thermomechanical response. Finite element analysis of products from such alloys requires a constitutive model covering the two-stage transformation sequence in its full thermodynamic nature. We propose an enhanced constitutive model for NiTi-based alloys, which incorporates R-phase as a distinctive phase with loading-dependent transformation strain. We validate the model on a newly acquired extensive experi-mental dataset on the thermomechanical response of Ni48Ti49Fe3 shape memory alloy and illustrate the capabilities of its implementation into finite element software on a computational structural analysis of a tightening ring. (C) 2021 The Authors. Published by Elsevier Ltd.
Permanent Link: http://hdl.handle.net/11104/0320129