Experimental study of new axial recentering dampers equipped with shape memory alloy plates

Mirzai, Nadia M.; Cho, Han Min; Hu, Jong Wan

doi:10.1002/stc.2680

Cited by 12 publications

(4 citation statements)

References 30 publications

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“…The use of the structural fuse has shown several benefits. One of the major benefits of damper usage is the component's replaceability after an event occurred; thus, the repair works are conducted effectively without affecting the structural functionality [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Curved Metal Damper to Improve Structural Energy Dissipation Capacity

et al. 2022

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Structural curved metal dampers are implemented in various applications to mitigate the damages at a specific area efficiently. A stable and saturated hysteretic behavior for the in-plane direction is dependent on the shape of a curved-shaped damper. However, it has been experimentally shown that the hysteretic behavior in the conventional curved-shaped damper is unstable, mainly as a result of bi-directional deformations. Therefore, it is necessary to conduct shape optimization for curved dampers to enhance their hysteretic behavior and energy dissipation capability. In this study, the finite element (FE) model built in ABAQUS, is utilized to obtain optimal shape for the curved-shaped damper. The effectiveness of the model is checked by comparisons of the FE model and experimental results. The parameters for the optimization include the curved length and shape of the damper, and the improved approach is conducted by investigating the curved sections. In addition, the design parameters are represented by B-spline curves (to ensure enhanced system performance), regression analysis is implemented to derive optimization formulations considering energy dissipation, constitutive material model, and cumulative plastic strain. Results determine that the energy dissipation capacity of the curved steel damper could be improved by 32% using shape optimization techniques compared to the conventional dampers. Ultimately, the study proposes simple optimal shapes for further implementations in practical designs.

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Section: Introductionmentioning

confidence: 99%

Optimization of the Curved Metal Damper to Improve Structural Energy Dissipation Capacity

et al. 2022

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“…Preventing structural collapse and saving lives is the most important criterion for the structural design of earthquake-resistant buildings. Severe structural damage, as well as widespread destruction of building performance after a major earthquake, can have an impact on the intensity of community welfare and resilience [8,9]. Some buildings are left in an unusable state due to the inelastic behavior shown at excessive load levels.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Investigation of Knee Brace Equipped with a Shape Memory Alloy Damper

Shakiba

Mortazavi

2022

Shock and Vibration

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Shape memory alloys (SMAs) are some of the new materials that have attracted the attention of many engineers due to their unique behavior. The most important advantage of these materials is their superelastic behavior, which allows the alloy to return to its original shape after a large deformation. In superelastic behavior, the shape memory alloy can also dissipate a significant amount of energy while returning to its original shape. In this research, the superelastic alloy made of nitinol has been used to improve the performance of knee dampers. For this purpose, a frame equipped with a knee damper was selected as the reference model and was modelled in Abaqus numerical software and validated with an experimental model. After ensuring the correct behavior of the numerical model, the SMA damper was installed perpendicular to the knee damper, between the knee damper and the beam to column connection. In this paper, two parameters of the SMA damper cross section area and SMA length were investigated. Based on the observed results, increasing the length of SMA increases the system resistance. As the cross section area of the SMA damper increases, the effect of the SMA length on the resistance of the system increases. On the other hand, increasing the cross section area of the SMA significantly increases the recentering of the system. Due to the significant recentering that the SMA damper creates in the structure, the amount of energy dissipation of the system is reduced compared to the reference model. The amount of dissipated energy depends on the length and cross section area of the SMA damper. Thus, the longer the SMA, the greater the energy dissipation, and the lower the SMA cross section area, the lower the system energy dissipation.

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“…Since shape memory alloy (SMA) wires are light, take up little space and a high energy density for the drive, they have started to be utilized as smart actuators in many engineering applications. They are used in a wide variety of engineering applications and study areas: in aircraft technologies and morphing structures (Barbarino et al, 2014; Epps and Chopra, 2001; Sellitto and Riccio, 2019), in biomechanical/bio-medical applications (Koç et al, 2016; Li et al, 2018; Veeramani et al, 2008), in civil structures for structural safety as vibration damping or reinforcement element (Hasnat et al, 2020; Mirzai et al, 2021; Ozbulut et al, 2011; Tabrizikahou et al, 2021), in robotics and control (Quintanar-Guzmán et al, 2019) also in soft robotics (Lee et al, 2019), in miniature applications (Kohl et al, 2004; Nespoli et al, 2010) and for some other practical applications such as soft wearable robots (Jeong et al, 2019; Park and Park, 2019).…”

Section: Introductionmentioning

confidence: 99%

Estimation of heat transfer model parameters by using recursive least square (RLS) method for a shape memory alloy wire

Önder

Sümer

Başlamışlı

2022

Journal of Intelligent Material Systems and Structures

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The thermal model of shape memory alloy (SMA) wires is improved by identifying the convectional heat transfer model (htm) parameters. Recursive Least Square (RLS) Method is used to estimate heat transfer coefficient, specific heat and latent heat coefficient. The parameters are estimated altogether with the surface area, volume and density of the wire. Also, after measuring the resistance by using multimeter, the value of each parameter was separately determined. Heat transfer coefficient is ambient dependent and dominant in the heat transfer model. The estimation of heat transfer coefficient is important and this is shown in this study. The proposed method builds an improved heat transfer model for SMA wire by using a single set of experimental data. Performance of the estimation with RLS is validated by using the measured data. It is shown that heat convection coefficient can be estimated with high accuracy. Thus, it is revealed that addition of the latent heat term during phase transformation into the model resulted in a more accurate model. The accuracy of the model can be enhanced by 28% by the addition of latent heat term.

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Experimental study of new axial recentering dampers equipped with shape memory alloy plates

Cited by 12 publications

References 30 publications

Optimization of the Curved Metal Damper to Improve Structural Energy Dissipation Capacity

Optimization of the Curved Metal Damper to Improve Structural Energy Dissipation Capacity

Analytical and Numerical Investigation of Knee Brace Equipped with a Shape Memory Alloy Damper

Estimation of heat transfer model parameters by using recursive least square (RLS) method for a shape memory alloy wire

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