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Title: Superelastic SMA U-shaped dampers with self-centering functions
Authors: Wang, B 
Zhu, SY 
Keywords: Shape memory alloy
Flag-shaped hysteresis loop
Strain rate
Seismic resilience
Issue Date: 2018
Publisher: Institute of Physics Publishing
Source: Smart materials and structures, May 2018, v. 27, no. 5, 55003 How to cite?
Journal: Smart materials and structures 
Abstract: As high-performance metallic materials, shape memory alloys (SMAs) have been investigated increasingly by the earthquake engineering community in recent years, because of their remarkable self-centering (SC) and energy-dissipating capabilities. This paper systematically presents an experimental study on a novel superelastic SMA U-shaped damper (SMA-UD) with SC function under cyclic loading. The mechanical properties, including strength, SC ability, and energy-dissipating capability with varying loading amplitudes and strain rates are evaluated. Test results show that excellent and stable flag-shaped hysteresis loops are exhibited in multiple loading cycles. Strain rate has a negligible effect on the cyclic behavior of the SMA-UD within the dynamic frequency range of typical interest in earthquake engineering. Furthermore, a numerical investigation is performed to understand the mechanical behavior of the SMA-UD. The numerical model is calibrated against the experimental results with reasonable accuracy. Then, the stress-strain states with different phase transformations are also discussed.
ISSN: 0964-1726
EISSN: 1361-665X
DOI: 10.1088/1361-665X/aab52d
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