SMA bending bars as self-centering and damping devices

Choi, Eunsoo; Mohammadzadeh, Behzad; Kim, Hee Sun

doi:10.1088/1361-665x/aaf5e3

Cited by 22 publications

(7 citation statements)

References 54 publications

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“…Shape memory alloys (SMAs) have been widely used in aerospace [1,2], instrumentation [3,4] and biomedical applications [5,6] because of their pseudoelasticity and shape memory effect. In recent decades, scholar and engineers have extensively developed constitutive models and prototypes of devices involving the mechanical behavior of SMAs [7,8].…”

Section: Introductionmentioning

confidence: 99%

A polynomial constitutive model of shape memory alloys based on kinematic hardening

Yang

Zhang

Scarpa

et al. 2023

Smart Mater. Struct.

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This paper describes the derivation of a phenomenological model for shape memory alloys under the framework of classical plasticity theory. The proposed model combines the Souza constitutive approach with kinematic hardening; the model requires solving only one nonlinear equation rather than several nonlinear ones, therefore improving the computational efficiency and convergence. Moreover, the original Souza model is improved by adding an odd polynomial function to describe the phase transformation of the shape memory alloys, making it possible to use a lower number of parameters for the inverse identification of the constitutive properties of SMAs from simple tensile tests. A tangent stiffness formulation is also derived to simulate the variation of the elastic modulus during the phase transformation. The tangent stiffness formulation proposed here extends the one used in classical plasticity theory and improves the convergence of the proposed model. The reliability and fidelity of the model described in this work are benchmarked against experimental data and other models. The numerical results show that the proposed phenomenological approach can describe well the pseudoelasticity and shape memory effect of shape memory alloys. The formulation described in this paper can be readily generalized to finite strains and other formulations based on existing works related to classical plasticity theory.

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Section: Introductionmentioning

confidence: 99%

A polynomial constitutive model of shape memory alloys based on kinematic hardening

Yang

Zhang

Scarpa

et al. 2023

Smart Mater. Struct.

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“…Viscoelastic materials have significant hysteresis damping and can be combined with SMA material to have the dual advantages of stiffness tuning and structural damping. Many researchers explored the capability of such combinations in vibration control by constructing composites, testing those in a laboratory, and using simulation software [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the damping behavior of shape memory alloy-nitinol reinforced composite

2022

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The use of Shape Memory Alloy (SMA) recently increased in smart structures. It is essential to investigate the impact of viscoelastic material, and transformation temperatures of SMA on dynamic behavior, especially the damping capability of the SMA reinforced composite. In this paper, the damping constants of SMA and viscoelastic material are evaluated experimentally, and a damping model based on experimental results is proposed for the composite. The effect of SMA wires in combination and selective activation has been studied using the proposed model and validated experimentally. It has been observed that damping predicted by the model is close to damping calculated by experimentation. Also, damping varies with the transformation temperatures of SMA. Thus, dynamic control of the SMA reinforced composite is feasible by controlling transformation temperature. The composite studied in this work can shift the damping by 9.58% by activating all nitinol wires.

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“…In order to overcome the buckling problem, Choi et al (2009) proposed the use of a superelastic SMA bars in bending as seismic dampers and restrainers for bridges and proved their ability in reducing the openings at the internal hinges and the pounding force on abutments. Later, Choi et al (2019) investigated the self-centering and damping capacity of SMA bars in bending. They showed that a martensitic SMA bar exploiting the shape memory effect displays a higher energy dissipation and thus a better seismic efficiency than a superelastic SMA bar, while the latter provides better displacement recovery and self-centering capability.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of the shape memory effect in SMA beams with rectangular cross section under reversed pure bending

Radi

2021

Journal of Intelligent Material Systems and Structures

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An analytical model is developed for a prismatic SMA beam with rectangular cross section subjected to alternating bending at temperature below the austenitic transformations. The loading path consists in a loading-unloading cycle under bending and then under reversed bending. Two opposite martensitic variants take place, whose volume fractions evolve linearly with the axial stress. Different Young’s moduli are taken for the austenitic and martensitic phases. As the bending moment is increased, the martensitic transformation starts from the top and bottom and then it extends inwards. If the maximum applied bending moment is large enough, then the complete Martensitic transformation takes place at the upper and lower parts of the cross section. During unloading and the following reversed bending, reorientation of the Martensite variant into the opposite one takes place starting from the boundary between the fully martensitic region and the intermediate transforming region. Special attention is devoted to calculate analytically the axial stress and Martensite variant distributions within the cross section at each stage of the process. A closed form moment-curvature relation is provided for loading and elastic unloading and in integral form for the rest of the process. The approach is then validated by comparison with analytical results available in the literature.

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SMA bending bars as self-centering and damping devices

Cited by 22 publications

References 54 publications

A polynomial constitutive model of shape memory alloys based on kinematic hardening

A polynomial constitutive model of shape memory alloys based on kinematic hardening

Investigation of the damping behavior of shape memory alloy-nitinol reinforced composite

Analytical modeling of the shape memory effect in SMA beams with rectangular cross section under reversed pure bending

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