Mechanical Properties and Contractile Force Mechanism of Shape Memory Alloy Knitted Fabric Actuator

Q4 Materials Science Journal of Textile Engineering Pub Date : 2019-06-15 DOI:10.4188/jte.65.47
Akichika Nakashima, Yusuke Higuchi, Yohei Sato, Lina Wakako, T. Kinari
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Abstract

The purpose of this research is to clarify the contractile force mechanism of a shape memory alloy (SMA) knitted fabric actuator. We knitted SMA yarn with plain stitches. We then determined the limit up to which SMA plain knitted fabric can be uniaxially elongated and thereafter the original dimensions can be recovered through its repeated heating. Moreover, the temperature dependence of SMA plain knitted fabric in the case of contractile force is quantitatively evaluated experimentally by heating it and then measuring its tension after it is extended to a certain length and fixed at both ends. The results show that, in its wale direction, the maximum tension by heating exceeds the tension corresponding to the extension. Furthermore, it is confirmed that theoretical calculations for the tensile properties of the knitted fabric of spun yarn and filament yarn can be applied to plain knitted fabric of SMA yarn. Using this theoretical calculation, and the flexural rigidity measured by KES system, it is clarified the contractile force of the SMA knitted fabric actuator is affected not only by contraction of SMA yarn but also an increase in its flexural rigidity.
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形状记忆合金针织物作动器的力学性能及收缩力机理
研究形状记忆合金(SMA)针织物致动器的收缩力机理。我们用平针编织SMA纱线。然后,我们确定了SMA平纹针织织物可以单轴拉伸的极限,然后通过反复加热可以恢复原始尺寸。此外,通过对SMA平纹针织物进行加热,拉伸至一定长度并两端固定后测量其张力,定量评价了SMA平纹针织物在收缩力作用下的温度依赖性。结果表明,在拉伸方向上,加热后的最大张力大于拉伸时的最大张力;此外,还证实了棉纱和长丝针织物拉伸性能的理论计算可以应用于SMA纱平纹针织物。通过理论计算和KES系统测得的抗弯刚度,阐明了SMA针织物致动器的收缩力不仅受SMA纱线收缩的影响,而且受SMA纱线抗弯刚度增大的影响。
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来源期刊
Journal of Textile Engineering
Journal of Textile Engineering Materials Science-Materials Science (all)
CiteScore
0.70
自引率
0.00%
发文量
4
期刊介绍: Journal of Textile Engineering (JTE) is a peer-reviewed, bimonthly journal in English and Japanese that includes articles related to science and technology in the textile and textile machinery fields. It publishes research works with originality in textile fields and receives high reputation for contributing to the advancement of textile science and also to the innovation of textile technology.
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