形状記憶合金平編地ァクチユエ一夕の機械的特性と収縮力発生機構

摘要

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.%我が国においては平均寿命が伸びる一方，急激な出生率の低下に伴い高齢化が進展している.総人口に占める65歳以上の高齢者の人口の割合である高齢化率は，1970年に7%，1994年に14%を超えた後も上昇し続け，2010年には23.1%となり，いわゆる超高齢社会に突入，2017年では27.7%にまで達している.このような中，病気やけがなどにより日常に支障が出ることなく生活を送ることができる健康寿命の延伸による生活の質の向上が重要になってきており，疾病予防や健康増進，介護予防などにより健康寿命を延伸するツールの一つとして.スマートテキスタイルが注目されている.