Loading rate and temperature dependency of superelastic Cu–Al–Mn alloys

Gencturk, Bora; Araki, Yoshikazu; Kusama, Tomoe; Omori, Toshihiro; Kainuma, Ryosuke; Medina, Fernando R. Contreras

doi:10.1016/j.conbuildmat.2013.12.002

Cited by 35 publications

(31 citation statements)

References 19 publications

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“…When stopper activation took place (run 6, B-SMA1), the measured strain rate was less than 150% per second. Within this range, little strain rate dependence was observed in the material tests reported in the authors' previous work [13].…”

Section: Comparison With Shaking Table Testsmentioning

confidence: 74%

“…The observed peak drift angle values can be considered as within an acceptable range because the peak drift angle generally ranges from 0.01 to 0.02 rad when low-rise to middle-rise steel buildings designed in accordance with Japanese code are subject to strong design ground motions with return periods of 500 years [22]. The observed peak strain values of SMA bars can be also considered as within an acceptable range because fracture was not observed and the shape of the stress-strain curve did not change so much when the superelastic Cu-Al-Mn SMA bars were subject to several tens of strain cycles of more than 5% in the authors' previous experimental investigations [13,17].…”

Section: Deformation Demandsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…It should be remarked here that, with the cyclic heat treatment, single crystals or bamboo grains can be obtained at a low cost comparable with conventional polycrystalline Cu-based SMAs. The newly developed large diameter SMA bars offer excellent recoverable strain comparable with Ni-Ti SMAs along with superior machinability, material cost, and loading rate and temperature dependence to Ni-Ti SMAs [12,13].This work presents shaking table tests of a steel frame equipped with superelastic Cu-Al-Mn SMA braces. In the shaking table tests, the steel frame is subjected to a series of scaled ground motions recorded during the 1995 Kobe earthquake, Japan.…”

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confidence: 99%

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Shaking table tests of steel frame with superelastic Cu–Al–Mn SMA tension braces

Araki

Shrestha

Maekawa

et al. 2015

Earthq Engng Struct Dyn

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Summary Shaking table tests are performed on a one‐bay one‐story steel frame with superelastic Cu–Al–Mn shape memory alloy (SMA) tension braces. The frame is subjected to a series of scaled ground motions recorded during the 1995 Kobe earthquake, Japan. The test results demonstrate that the SMA braces are effective to prevent residual deformations and pinching. It is also shown that the time history responses observed from the shaking table tests agree well with the numerical predictions using a rate‐independent piecewise‐linear constitutive model calibrated to the quasi‐static component tests of the SMA braces. This suggests that the loading rate dependence of Cu–Al–Mn SMAs as well as the modeling error due to the piecewise linear approximation can be neglected in capturing the global response of the steel frame. Numerical simulations under a suite of near‐fault ground motion records are further performed using the calibrated analytical models to demonstrate the effectiveness of the SMA braces when the variability of near‐fault ground motions is taken into account. A stopper, or a deformation restraining device, is also proposed to prevent premature fracture of SMA bars in unexpectedly large ground motions while keeping the self‐centering capability in moderate to large ground motions. The effectiveness of the stopper is also demonstrated in the quasi‐static component and shaking table tests. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Comparison With Shaking Table Testsmentioning

confidence: 74%

Section: Deformation Demandsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Shaking table tests of steel frame with superelastic Cu–Al–Mn SMA tension braces

Araki

Shrestha

Maekawa

et al. 2015

Earthq Engng Struct Dyn

Self Cite

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“…This behaviour can be explained by the fact that SMA may have deformed in martensitic elastic state. As presented by Gencturk, Araki [43], after loading to 6% strain, Cu-Al-Mn SMA is in martensitic elastic state and the stiffness starts to increase.…”

Section: Resultsmentioning

confidence: 99%

Feasibility of shape memory alloy in a tuneable mass damper to reduce excessive in-service vibration

Huang

Chang

Mosalam

2016

Struct. Control Health Monit.

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Summary The applications of shape memory alloy (SMA) in vibration reduction are benefited by its superelasticity and thermomechanical properties. This study is a part of a series of research projects focused on reduction of timber floor vibration. In this study, the feasibility of this tuneable mass damper is tested for in‐service vibration reduction. At first, the effect of temperature ranging from 11 °C to 120 °C on the dynamic characteristics of SMA was investigated under different pre‐stressed levels. At higher temperatures, the damping ratio reduces while stiffness increases, and vice versa with decreasing temperature. SMA is sensitive to temperature when the pre‐stressed level is near the phase transformation stress. Next, the analytical model of timber floor system was built and idealised as a two‐degree‐of‐freedom system. Thirdly, a series of lab tests were carried out, and a damper consisting of an SMA bar was added on a cantilever beam with different natural frequencies, which represents floor system in the model. The results show that the vibration response of the system can be significantly reduced by the damper developed in this project, when the damper has resonance with the system. The mass of the system was then changed so as to make the damper out‐of‐tuned; the damper was then retuned by cooling/heating on SMA. After retuning of the damper, the response of the system was effectively reduced, which demonstrates the effectiveness and feasibility of employing SMA in the damper system. Copyright © 2016 John Wiley & Sons, Ltd.

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Probabilistic seismic evaluation of SMA‐based self‐centering braced structures considering uncertainty of regional temperature

Chen

Wang

Fang

2021

Earthq Engng Struct Dyn

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Smart materials such as shape memory alloys (SMAs) have unique material properties that can potentially mitigate structural damage against earthquake. However, the mechanical behavior of SMAs is sensitive to temperature variation. The traditional deterministic analysis, which does not take into account the influence of temperature, may lead to inaccurate and sometimes unsafe predictions of actual behavior of SMA‐based structures. This research aims to develop a modified framework based on the performance‐based earthquake engineering methodology, taking account of the uncertainty of regional temperature distribution for temperature‐dependent (TD) structures, where the SMA‐based one is considered as a representative case. As the main part of the methodology, regional seismic fragility is generated by combing temperature distribution properties and joint seismic fragility. The proposed methodology is applied to a six‐story self‐centering concentrically‐braced frame (SC‐CBF) with SMA‐based SC braces located in different regions in China. A simplified thermo‐mechanical model capturing the TD characteristics and possible failure of SMA cables is utilized. Deterministic nonlinear static and dynamic analysis is first conducted to understand the structural response. Then, the joint seismic fragility analysis of the SC‐CBF under different intensity levels of ground motion and temperatures is conducted via the incremental dynamic analysis method, by which the seismic performance of the structure can be fully captured. Finally, the proposed methodology is utilized to comprehensively evaluate the regional seismic fragility and collapse risk of the SC‐CBF in different regions. The results indicate that the ignorance of the temperature effect could underestimate the risk of collapse.

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Loading rate and temperature dependency of superelastic Cu–Al–Mn alloys

Abstract: This paper presents results from recent experiments performed on superelastic Cu-Al-Mn alloy bars (rods) with different diameters under various loading rates and temperatures.

Cited by 35 publications

References 19 publications

Shaking table tests of steel frame with superelastic Cu–Al–Mn SMA tension braces

Shaking table tests of steel frame with superelastic Cu–Al–Mn SMA tension braces

Feasibility of shape memory alloy in a tuneable mass damper to reduce excessive in-service vibration

Probabilistic seismic evaluation of SMA‐based self‐centering braced structures considering uncertainty of regional temperature

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