Superelastic shape memory alloy cables: Part I – Isothermal tension experiments

Reedlunn, Benjamin; Daly, Samantha; Shaw, John A.

doi:10.1016/j.ijsolstr.2013.03.013

Cited by 79 publications

(45 citation statements)

References 25 publications

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“…The results open up new possibilities in application [35,36] and strongly encourage the development of nanostructured NiTi with small D and dT d / …”

Section: Introductionmentioning

confidence: 74%

Effects of grain size on tensile fatigue life of nanostructured NiTi shape memory alloy

Yin¹,

He²,

Moumni³

et al. 2016

International Journal of Fatigue

121

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“…The results open up new possibilities in application [35,36] and strongly encourage the development of nanostructured NiTi with small D and dT d / …”

Section: Introductionmentioning

confidence: 74%

Effects of grain size on tensile fatigue life of nanostructured NiTi shape memory alloy

Yin¹,

He²,

Moumni³

et al. 2016

International Journal of Fatigue

121

View full text Add to dashboard Cite

“…The nickeltitanium (NiTi) alloys, also known as Nitinol, are the most widely exploited alloys for seismic applications, due to their superior material properties (DesRoches and Smith, 2004;Wilson and Wesoliwsky, 2005;Alaneme and Okotete, 2016). Recently, SMA cables made from NiTi wires, a relatively new class of structural elements, have been developed to provide significant cost advantages over a monolithic bar of equivalent diameter, while offering unique properties such as adaptive functionality (shape memory and superelasticity) and additional functionality (Reedlunn et al, 2013;Carboni et al, 2015;Ozbulut et al, 2015). Therefore, the development of the SMA cable can contribute to the extensive application of shape memory alloys in structural applications, due to the advantages of significant cost savings and unique adaptive characteristics.…”

Section: Sma Overviewmentioning

confidence: 99%

“…These test results showed that the hysteresis loops of both SMA wires and bars experience similar degradation under cyclic load. properties, such as shape memory or superelasticity, and new adaptive functionality (Reedlunn et al, 2013;Carboni et al, 2015;Ozbulut et al, 2015 (Reedlunn et al, 2013). By adopting the recently developed, highly optimized manufacturing process for wires, SMA cables can expedite the application of SMAs in infrastructure applications due to their superior mechanical properties, large force capacities, and lower cost over SMA bars.…”

Section: Cyclic Propertiesmentioning

confidence: 99%

“…By adopting the recently developed, highly optimized manufacturing process for wires, SMA cables can expedite the application of SMAs in infrastructure applications due to their superior mechanical properties, large force capacities, and lower cost over SMA bars. Figure 2-8 shows the hysteric cyclic behavior of a single NiTi wire and the SMA strand with the seven-wire NiTi, exhibiting a restoring stress of the strand lower than the single wire at the same strain level (Reedlunn et al, 2013). The lower stress in the strand caused by the intertwined sliding friction forces generated between the wires.…”

Section: Cyclic Propertiesmentioning

confidence: 99%

“…They leverage the superior mechanical characteristics of small diameter SMAs into large-size structural tension elements. Besides, they have considerable cost advantages over same size monolithic SMA bars (Reedlunn et al, 2013). In this study, SMA cables are considered for the development of a hybrid seismic device.…”

Section: Experimental Characterization Of Sma Cablesmentioning

confidence: 99%

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Enhancing Resilience of Steel Frame Buildings Using Superelastic Viscous Dampers

Silwal¹

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Conventional seismic design approaches rely on the ability of structures to dissipate the input earthquake energy through inelastic deformations in the designed regions of steel frames, implying substantial structural damage and potential residual drifts after a major earthquake event.Peak response quantities, such as peak story drifts and peak floor accelerations, are typically considered to evaluate the performance of different structural systems under seismic loads.However, several studies have shown that residual drifts, which occur due to the nonlinear behavior of yielding components of a structural system, may hold an important role in defining the performance of a structure after a seismic event and in the evaluation of potential damage. To enhance the seismic performance of structural systems, systems that can provide stable energy dissipation with full self-centering capabilities are desirable. These systems, known as selfcentering or re-centering, exhibit a flag-shaped hysteric response with the ability to return to small or zero deformation after each cycle. Such a self-centering system controls structural damage while minimizing residual drifts.This dissertation proposes a hybrid passive control device and investigates its performance in improving the response of steel frame structures subjected to multi-level seismic hazards. The proposed superelastic viscous damper (SVD) relies on shape memory alloy (SMA) cables for recentering capability and employs a viscoelastic damper, which consists of two layers of a high damped blended butyl elastomer compound, to augment its energy dissipation capacity. First, the iv design and behavior of the proposed device are introduced. Then, the influences of various design parameters on the mechanical response of the device are investigated. Numerical models for the SVDs and steel moment frame buildings are developed in a finite element analysis program to determine the dynamic response of the structure to various levels of seismic hazards. The performance of steel structures retrofitted or newly designed with the installed SVDs is explored through nonlinear response history analyses. In addition, the seismic collapse resistance of steel frame buildings with SVDs is comparatively evaluated. The aftershock performance of steel frame buildings, with and without installed SVDs, is also investigated. Next, the effect of the ambient temperature on the performance of the proposed device is assessed. Finally, the seismic loss

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Multifunctional Spun Yarns and Textiles from Nickel‐Titanium Microfilaments

Weinberg

Cai²,

Schaffer³

et al. 2020

Adv Materials Technologies

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Improvements in multifunctional materials have led researchers to reinvigorate traditional textile structures by integrating emerging material technologies to offer novel solutions to diverse industries. However, there exist few multifunctional materials capable of being produced with micrometer diameters that can be spun into yarns for textile manufacturing, limiting the wearability and tunability of multifunctional textiles. Here, the creation of nickel‐titanium (NiTi) smart material‐based yarns is enabled by the availability of small diameter (≤10 µm) NiTi filaments that can survive the yarn spinning manufacturing process. NiTi microfilament yarns exhibit traditional superelastic and shape memory properties, and afford additional improvements to mechanical performance such as a tunable structural stiffness, plateau strength, and actuation contractions through the introduction of controllable geometric parameters—yarn count, surface twist angle, and manufacturing strains. This work concludes in a densely knitted, closed‐form textile with shape memory actuation and superelastic recovery. NiTi microfilament yarns and textiles have promising impacts in actuating and energy‐absorbing technologies for medical, robotics, aerospace, and defense applications.

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Superelastic shape memory alloy cables: Part I – Isothermal tension experiments

Cited by 79 publications

References 25 publications

Effects of grain size on tensile fatigue life of nanostructured NiTi shape memory alloy

Effects of grain size on tensile fatigue life of nanostructured NiTi shape memory alloy

Enhancing Resilience of Steel Frame Buildings Using Superelastic Viscous Dampers

Multifunctional Spun Yarns and Textiles from Nickel‐Titanium Microfilaments

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