Superelastic SMA U-shaped dampers with self-centering functions
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 stud...
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Published in | Smart materials and structures Vol. 27; no. 5; pp. 55003 - 55016 |
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Main Authors | , |
Format | Journal Article |
Language | English |
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IOP Publishing
01.05.2018
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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. |
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AbstractList | 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. |
Author | Zhu, Songye Wang, Bin |
Author_xml | – sequence: 1 givenname: Bin surname: Wang fullname: Wang, Bin organization: South China University of Technology State Key Laboratory of Subtropical Building Science, Guangzhou, People's Republic of China – sequence: 2 givenname: Songye orcidid: 0000-0002-2617-3378 surname: Zhu fullname: Zhu, Songye email: ceszhu@polyu.edu.hk organization: The Hong Kong Polytechnic University Department of Civil and Environmental Engineering, Hung Hom, Kowloon, Hong Kong, People's Republic of China |
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SubjectTerms | flag-shaped hysteresis loop seismic resilience self-centering shape memory alloy strain rate superelastic |
Title | Superelastic SMA U-shaped dampers with self-centering functions |
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