Thermomechanical behaviors of Ni–Ti shape memory alloy ribbons and their numerical modeling

Roh, Jae Kyu; Bae, Jong‐Sup

doi:10.1016/j.mechmat.2010.06.005

Cited by 15 publications

(10 citation statements)

References 15 publications

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“…The second stage was believed to be a result of stress-induced martensitic transformation from R-phase to B19 martensite. Roh and Bae (2010) modified the earlier models on SMAs and proved that without considering the presence of R-phase in the material, modeling frameworks would not give accurate results about the materials’ behaviors.…”

Section: Introductionmentioning

confidence: 99%

“…In a majority group of thermomechanical models for SMAs, only transformation between austenite and martensite is considered. However, for a large number of cases, the intermediate phase appears in the material during cooling cycle because of several reasons such as annealing at specific temperatures or thermal cycling (Roh and Bae, 2010). Therefore, neglecting the effects of R-phase may result in some deficiencies in modeling.…”

Section: Introductionmentioning

confidence: 99%

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Proposition of R-phase transformation strip in the phase diagram of Ni-Ti shape memory alloy using electromechanical experiments

Shayanfard

Kadkhodaei

Safaee

2017

Journal of Intelligent Material Systems and Structures

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The shape memory mechanism associated with R-phase transformation was investigated using electromechanical tests on Ni-Ti shape memory alloy thin wires. To provide a more precise insight into the effects of R-phase on phase transformation of shape memory alloys, wires were prepared in three different initial states prior to conducting the experiments: pure martensite, mixture of R-phase and martensite, and pure R-phase. The electromechanical tests were done in two different loading states (under constant and variable stresses) using specially designed and manufactured apparatuses. Tests under different constant stresses were carried out for three cases of pure martensite, a mixture of martensite and rhombohedral, and pure rhombohedral phase, while those under variable stresses were done on pure martensite as well as mixed martensite and rhombohedral. For all the expressed cases, strain–time responses were investigated during electric heating–cooling cycles to interpret possible microstructural changes in the samples. According to the results, a phase diagram containing R-phase transition strip was proposed for Ni-Ti shape memory alloys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proposition of R-phase transformation strip in the phase diagram of Ni-Ti shape memory alloy using electromechanical experiments

Shayanfard

Kadkhodaei

Safaee

2017

Journal of Intelligent Material Systems and Structures

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“…To calculate the increment of stress for the given strain and temperature increments, we use the Newton-Raphson iteration method [14,15].…”

Section: Introductionmentioning

confidence: 99%

Vibration behaviors of hybrid smart composites with SMA strips reinforced SMP lamina under blast loading

Roh

Kim

Kwon

2015

Composite Structures

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“…In these actuators, the right combination of the polymer and SMA thin film leads to a two-way stable behaviour during heating and cooling. More recently, Roh and Bae [17] have numerically and experimentally investigated the thermo-mechanical behaviour of NiTi strips associated with stress and temperature-induced transformations. The activation of the SMA strips causes a bending deformation on the actuator, which has remarkable vertical tip deflections.…”

Section: Introductionmentioning

confidence: 99%

TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach

Fortini

Merlin

Rizzoni

et al. 2014

Frattura Ed Integrità Strutturale

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This paper deals with the two-way shape memory effect (TWSME) induced on a strip of a nearequiatomic NiTi alloy by means of the shape memory cycling training method. This procedure is based on the deformation in martensite state to reach the desired cold shape followed by cycling the temperature from above A f to below M f . To this end, the sample was thermally treated to memorise a bent shape, thermomechanical trained as described and thermally cycled in unloaded conditions in order to study the stability of the induced TWSME. Heating to A f was reached by a hot air stream flow whereas cooling to M f was achieved through natural convection. The evolution of the curvature with the increasing number of cycles was evaluated. The thermomechanical behaviour of the strip undergoing uniform bending was simulated using a one-dimensional phenomenological model based on stress and the temperature as external control variables. Both martensite and austenite volume fractions were chosen as internal parameters and kinetic laws were used in order to describe their evolution during phase transformations. The experimental findings are compared with the model simulation and a numerical prediction based on the approach proposed in [25].

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Thermomechanical behaviors of Ni–Ti shape memory alloy ribbons and their numerical modeling

Cited by 15 publications

References 15 publications

Proposition of R-phase transformation strip in the phase diagram of Ni-Ti shape memory alloy using electromechanical experiments

Proposition of R-phase transformation strip in the phase diagram of Ni-Ti shape memory alloy using electromechanical experiments

Vibration behaviors of hybrid smart composites with SMA strips reinforced SMP lamina under blast loading

TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach

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