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Smart Structures and Systems Volume 6, Number 1, January 2010 , pages 73-85 DOI: https://doi.org/10.12989/sss.2010.6.1.073 |
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Experimental studies on the fatigue life of shape memory alloy bars |
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Sara Casciati and Alessandro Marzi
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| Abstract | ||
| The potential offered by the thermo-mechanical properties of shape memory alloys (SMA) in structural engineering applications has been the topic of many research studies during the last two decades. The main issues concern the long-term predictability of the material behaviour and the fatigue lifetime of the macro structural elements (as different from the one of wire segments). The laboratory tests reported in this paper are carried out on bar specimens and they were planned in order to pursue two objectives. First, the creep phenomenon is investigated for two different alloys, a classical Ni-Ti alloy and a Cu-based alloy. The attention is then focused on the Cu-based alloy only and its fatigue characteristics at given temperatures are investigated. Stress and thermal cycles are alternated to detect any path dependency. | ||
| Key Words | ||
| creep; fatigue; hysteresis; shape memory alloys; thermo-mechanics; viscosity. | ||
| Address | ||
| Sara Casciati; Department ASTRA, University of Catania, Via delle Maestranze 99, 96100 Siracusa, Italy Alessandro Marzi; Department of Structural Mechanics, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy | ||