期刊
MATERIALS & DESIGN
卷 203, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2021.109593
关键词
NiTiFe shape memory alloys; R-phase; Constitutive model; Finite element analysis
资金
- Czech Science Foundation [GA18-03834S]
- Ministry of Education, Youth and Sports of the Czech Republic [CZ.02.1.01/0.0/0.0/16_013/0001794]
The study presents an enhanced constitutive model for NiTi-based alloys incorporating an intermediate R-phase transformation with loading-dependent transformation strain. Validated on experimental data, the model demonstrates capabilities for computational structural analysis in finite element software applications.
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.
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