Abstract
A shape memory alloy (SMA) is expected to be applied as intelligent or smart material since it shows the functional characteristics of the shape memory effect and superelasticity. Most SMA elements, with these characteristics, perform cyclic motions. In these cases, the fatigue property of SMA is one of the most important subjects in view of evaluating functional characteristics of SMA elements. The fatigue properties are complex since they depend on stress, strain, temperature and their hysteresis. If SMA is implanted by high energy ions, the thermomechanical properties of the material may change, resulting in long fatigue life. If the ultrasonically activated shot peening is applied to SMA, the compressive residual stress may be produced, resulting in an increase in fatigue performance. In the present study, the tensile deformation and bending fatigue properties of a superelastic thin wire, a highelastic thin wire, and a superelastic tape, all made of TiNi alloys, were investigated experimentally. In order to improve the fatigue properties, the nitrogen ion implantation and the ultrasonic shot peening were applied to modify the surface layer of the TiNi SMA tape and the influence of implantation and shot peening treatments on the bending fatigue properties was investigated.
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Acknowledgements
The experimental work for this study was carried out with the assistance of students in Aichi Institute of Technology, to whom the authors wish to express their gratitude. The authors also wish to extend thanks to the administrators of Scientific Research (C) (General) in Grants-in-Aid for Scientific Research by the Japan Society for Promotion of Science for financial support.
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Matsui, R., Takeda, K., Tobushi, H. (2017). Fatigue Property and Enhancement of Fatigue Life of TiNi Shape Memory Alloys—An Over View. In: Sun, Q., Matsui, R., Takeda, K., Pieczyska, E. (eds) Advances in Shape Memory Materials. Advanced Structured Materials, vol 73. Springer, Cham. https://doi.org/10.1007/978-3-319-53306-3_9
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