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Lookup NU author(s): Dr Haoyu HuangORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2020 Haoyu Huang et al.The behaviour under cyclic bending and in particular the fatigue properties of shape memory alloy (SMA) bars are important for civil engineering applications. In this paper, structural and functional fatigue is studied for both NiTi- and copper-based shape memory alloys. The results are presented from cyclic bending tests on 7 mm diameter NiTi and 12 mm diameter CuAlMn SMA bars targeted at 100,000 cycles. During the tests, dynamic loading at 1 Hz, 5 Hz, and 8 Hz was applied for different strain levels (0.5%, 1%, 2%, and 6%). The stress-strain curve, damping ratio, and secant stiffness were analysed for material characterisation, and the evolution of these parameters was studied to assess functional fatigue. The fatigue life is extended dramatically when the strain is below 1%, and the structural fatigue life of CuAlMn is shown to be better than that of NiTi and to depend on the loading rate. However, decay in stiffness can be found in the CuAlMn SMA, which is considered to be caused particularly by its long grain boundary.
Author(s): Huang H, Zhu Y-Z, Chang W-S
Publication type: Article
Publication status: Published
Journal: Advances in Materials Science and Engineering
Year: 2020
Volume: 2020
Online publication date: 14/01/2020
Acceptance date: 25/11/2019
Date deposited: 14/03/2022
ISSN (print): 1687-8434
ISSN (electronic): 1687-8442
Publisher: Hindawi Limited
URL: https://doi.org/10.1155/2020/8024803
DOI: 10.1155/2020/8024803
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