聚合物的热粘弹性对形状记忆合金作动性能的影响

Influence of Thermo-Viscoelastic Behavior of Polymer on Actuation Performance of Shape Memory Alloy

利用一维变温热粘弹性理论分析聚合物杆 ,Brinson本构方程描述形状记忆合金 ,研究了变温场下形状记忆合金与聚合物杆组合结构的作动性能 ,并与用热弹性理论分析组合结构中聚合物杆的结果进行了比较 .分析表明 ,在一定温度范围内 ,两种理论计算结果比较接近 ;当温度大大高于聚合物杆的玻璃态转化温度时 ,两者结果相差较大 .此外 ,还讨论了粘弹性材料性质。

The actuation performance of shape memory alloy (SMA), which is connected in series with a polymeric bar, was analyzed. The thermo-viscoelastic theory was applied to the polymeric bar while Brinson's one-dimensional constitutive law was employed for SMA. It is found that the results from thermo-viscoelastic analysis coincide well with those of thermo-elastic analysis within low temperature range; however, notable discrepancy occurs when temperature is much higher than the glass transition temperature of the polymer bar. The effects of viscoelastic material properties and temperature on the actuation performance of SMA were also discussed.