Thermal study of a shape memory alloy (SMA) spring actuator designed to insure the motion of a barrier structure

Degeratu, Sonia; Rotaru, P.; Rizescu, Sabin; Bizdoaca, Nicu George

doi:10.1007/s10973-012-2369-4

Cited by 29 publications

(9 citation statements)

References 17 publications

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“…This means that during rapid cooling, the high-temperature bphase is expanded into a L2 1 -ordered structure and can further be transformed into a martensite phase of 18R 14].To analyze the crystallite size on the transformation temperatures of the alloys, we calculated crystallite size for the alloys. For this, we used the following relation [15,16]:…”

Section: Methodsmentioning

confidence: 99%

New type of Schottky diode-based Cu–Al–Mn–Cr shape memory material films

et al. 2016

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Cr-doped CuAlMn shape memory alloys were produced by arc melting method. The effects of Cr content on microstructure and transformation parameters of were investigated. The alloys were characterized by X-ray analysis, optical microscope observations and differential scanning calorimetry measurements. The grain size of the alloys was decreased by the addition of Cr into CuAlMn alloy system. The martensite transformation temperature was shifted both the lower temperature and higher temperature with the addition of chromium. This change was explained on the basis of the change in the thermodynamics such as enthalpy, entropy and activation energy values. The obtained results indicate that the phase transformation temperatures of the CuAlMn alloy system can be controlled by addition of Cr. We fabricated a Schottky barrier diode and observed that ideality factor and barrier height increase with increasing temperature. The diodes exhibited a thermal sensor behavior. This indicates that Schottky diode-based Cu-Al-Mn-Cr shape memory material films can be used as a sensor in high-temperature measurement applications.

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Section: Methodsmentioning

confidence: 99%

New type of Schottky diode-based Cu–Al–Mn–Cr shape memory material films

et al. 2016

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“…The movement of the NiTi actuator is highly dependent on its temperature, an increase in temperature results in an equivalent increase in the material's young's modulus. Thus with increased temperature, the force exerted by a NiTi element increases dramatically [25]. Consequently, to determine the dynamic response of the actuator the transformation temperatures have to be known.…”

Section: Niti Sma Thermal Dynamicsmentioning

confidence: 99%

An Investigation of the Effects of Thermal Interference between Adjacent Nitinol Spring Actuators in a Tactile Display

Sekerere¹,

Ndeda²,

Karanja³

2023

WJET

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Over the years, there has been increased research interest in the application of Nitinol as an actuator, due to its shape memory behaviour, simplicity, high power-to-weight ratio, compactness, and extreme high fatigue resistance to cyclic motion, and noiseless operation. Nitinol has found application in tactile displays which reproduce tactile parameters such as texture and shape, depending on the application. This paper presents the effects of thermal interference between adjacent Nitinol spring actuators in a tactile display. The tactile display is made of a 3 by 3 pin array whose spatial resolution was varied from 4 mm to 6 mm in steps of 1 mm while a current of 1.5 A was used to actuate 8 of the springs, and the centre spring was left unactivated to observe the thermal effects on it due to the heat gradient formed. A Finite Element (FE) model was developed using COMSOL Multiphysics and the results were further verified through experimentation. In both cases, there was visible thermal interference between actuators. The increase in spatial resolution saw a decrease in thermal interference by 12.7%. Using a fan to introduce forced convection, reduced the thermal interference in the simulation by 20% and during experimentation by 11%. The results of this research indicate a spatial resolution of 6 mm reduced the thermal inference to a negligible rate. However, thermal interference could not be eliminated with these two methods.

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“…Degeratu et al [30] proposed a thermal study of a shape memory alloy (SMA) spring actuator designed to insure the motion of a barrier structure.…”

Section: State Of the Art On Systemsmentioning

confidence: 99%