A novel shape memory alloy-based element for structural stability control in offshore structures under cyclic loading

Zareie, Shahin; Alam, M. Shahria; Seethaler, Rudolf; Zabihollah, Abolghassem

doi:10.1080/17445302.2019.1688920

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…In addition, their compactness and high energy-volume ratio make these materials applicable for actuation 55 and in particular for UAVs, where the available room is limited. [57][58][59] A great disadvantage is however represented by the degradation of the performance with the cycles as shown in Zareie et al, 60 in which attention is paid to the mechanical changes of the properties and to the degradation of the damping performance due to cyclic loads. The damping coefficient, f.i., arrives at the 25% of its initial value after a few hundreds of cycles.…”

Section: Stiffness Versus Flexibility: Skinmentioning

confidence: 99%

Morphing wings review: aims, challenges, and current open issues of a technology

Ameduri

Concilio

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The scope of this work is to provide a critical review on the expectations about the morphing wing technology against the current open issues and showstoppers. In synergy to other emerging and promising technologies, morphing is asked for bridging the evident gap between the current growth trend of the aerospace compartment and its impact onto the environment. The potential of morphing, in particular, its primary impact on the aerodynamic efficiency of the aircraft, primed the investigation of different technologies, achieving interesting results but often highlighting limitations and showstoppers against the airworthiness regulations. The authors focus their attention on some specific aspects that characterize the morphing wing attachments and that may represent weakness points for the maturation of the technology: the load transmission of the movable parts to the supporting wing box, the way the flexibility–rigidity paradox is addressed by specific critical components (the skin), the scalability dependence of the morphing architectures, and the specific aeroelastic behavior of the nonconventional architectures.

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Section: Stiffness Versus Flexibility: Skinmentioning

confidence: 99%

Morphing wings review: aims, challenges, and current open issues of a technology

Ameduri

Concilio

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Smart systems can adapt themselves to different loading conditions [ 1 , 2 , 3 , 4 ]. In recent years, using lighter, stronger, and smarter materials has increased in different industries, including aerospace, military, transportation, and the construction of different structures [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Mechanical Behavior and Energy Dissipation in Fiber-Reinforced Polymers through Shape Memory Alloy Integration: A Numerical Study on SMA-FRP Composites under Cyclic Tensile Loading

Eilbeigi,

Tavakkolizadeh,

Masoodi

2023

Materials

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Conventional fiber-reinforced polymers (FRPs) have a relatively linear stress–strain behavior up to the failure point. Therefore, they show brittle behavior until the failure point. Shape memory alloys, in addition to having high ductility and good energy dissipation capability, are highly resistant to corrosion and show good performance against fatigue. Therefore, using the SMA fibers in the production of FRPs can be a suitable solution to solve the problem of the brittle behavior of conventional FRPs. SMA fibers can be integrated with a polymeric matrix with or without conventional fibers and create a new material called SMA-FRP. This study investigates the effect of using different volume fractions of conventional fibers (carbon, glass, and aramid) and SMA fibers (NiTi) in the super-elastic phase and the effect of the initial strain of SMA fibers on the behavior of SMA-FRP composites under cyclic tensile loading. Specimens are designed to reach a target elastic modulus and are modeled using OpenSees (v. 3.5.0) finite element software. Analyzing the results shows that in the SMA-FRP composites that are designed to reach a target elastic modulus, with an increase in the volume fraction of SMA fibers, the maximum stress, residual strain, and strain hardening ratio are reduced, and the ability to energy dissipation capability and residual stress increases. It was also observed that increasing the percentage of the initial strain of SMA fibers increases the maximum stress and energy dissipation capability and reduces the residual strain and yield stress. In the investigation of the effect of the type of conventional fibers used in the construction of composites, it was found that the use of fibers that have a larger failure strain increases the maximum stress and energy dissipation capability of the composite and reduces the strain hardening ratio. In addition, increasing the elastic modulus of conventional fibers increases the residual strain and residual stress of the composites.

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“…SMA are used in several engineering fields, including aerospace, biomedical, and automotive, due to their lightweight, high fatigue strength, vibration absorption, and corrosion resistance properties. There are experimental and numerical studies in the literature that emphasizes the use of SMAs in reinforced concrete systems [26], passive and semi-active SMA dampers [27,28], SMA based bracing systems [24,29], bolted connections [30,31], and vibration isolation system [32]. Recent studies unveiled that SMAs are significant candidates for vibration damping devices under dynamic loads [33,34].…”

Section: Introductionmentioning

confidence: 99%

Characterization of energy dissipative cushions made of Ni–Ti shape memory alloy

Güllü

Danquah

Dilibal

2021

Smart Mater. Struct.

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Earthquake-resistant design of structures requires dissipating seismic energy by deformations of structural members or additional fuse elements. Owing to its easy-to-produce, plug-and-play, high equivalent damping ratio, and large displacement capacity characteristics, energy dissipative steel cushions (SCs) were found to be an efficient candidate for this purpose. However, similar to other conventional metallic dampers, residual displacement after a strong shaking is the most notable drawback of the SCs. In this work, cushions produced from Ni–Ti shape memory alloy (SMA) are evaluated numerically by experimentally verified finite element models to assess their impact on the performance of earthquake-resistant structures. Furthermore, a reinforced concrete testing frame is retrofitted with energy dissipative steel and Ni–Ti cushions. Performance of the frames (e.g. dissipated energy by the cushions, hysteretic energy to input energy ratio, maximum drift, and residual drift) with different types of cushions are evaluated by nonlinear response history analyses. The numerical results showed that the SCs are effective to reduce peak responses, while Ni–Ti cushions are more favorable to reduce residual drifts and deformations. Hence, a hybrid system, employing the steel and SMA cushions together, is proposed to reach optimal seismic performance.

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A novel shape memory alloy-based element for structural stability control in offshore structures under cyclic loading

Cited by 11 publications

References 27 publications

Morphing wings review: aims, challenges, and current open issues of a technology

Morphing wings review: aims, challenges, and current open issues of a technology

Enhancing Mechanical Behavior and Energy Dissipation in Fiber-Reinforced Polymers through Shape Memory Alloy Integration: A Numerical Study on SMA-FRP Composites under Cyclic Tensile Loading

Characterization of energy dissipative cushions made of Ni–Ti shape memory alloy

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