Abstract:  In order to solve the contradictions between the large deformation and the loading capability of flexible skins and satisfy the smoothness and fatigue life of flexible skins in morphing wings， a novel two-way SMA bending actuator was presented， where a SMA plate was employed as adriving element. Based on the shape memory effects of SMA and the bending theory of mechanics of materials， the theoretical formulae for designing were deduced through analyzing the mechanical characteristics of deformation processes of the actuators. Then， the methods of heat forming and anti-deformation training were adopted to fabricate the actuators， and the deformation capability of the actuators was tested. The results indicate that the deformation behavior of the two-way SMA bending actuator designed according to the theoretical formulae agrees with the tested ones. With the heating temperature rising， the deflections and the output forces of the actuators gradually increase until reaching the maximum deflection. With the thickness of the spring steel plate increasing， the maximum deflections and the maximum output forces of the actuators gradually decrease and the response speed of deformation under heating is slowed down， but the response of recovery under cooling processes is accelerated. After cyclic motivations， the deformation performance of the actuators maintain stable. 

Key words: shape memory alloy（SMA） plate, two-way, bending actuator, design, test

摘要： 为解决变体机翼中蒙皮大变形与承载力之间的矛盾，同时满足光顺性及疲劳寿命的要求，提出了一种以形状记忆合金板为驱动元件的双程弯曲驱动器。基于形状记忆效应及材料力学弯曲理论，通过对驱动器变形过程中的力学特性进行分析，推导出双程弯曲驱动器的设计理论，再利用热成形法与反变形训练法制备出驱动器样件并进行了变形性能测试。研究结果表明：依据推导出的理论所设计的形状记忆合金双程弯曲驱动器的变形量与试验结果一致；随着加热温度的升高，驱动器的挠度及输出力逐渐增大，直至达到最大值；随着回复弹簧钢板厚度的增大，驱动器的最大挠度及最大输出力减小，加热变形响应速度减慢，但冷却回复响应速度加快；经过循环激励后，驱动器的变形效果稳定。

关键词: 形状记忆合金板, 双程, 弯曲驱动器, 设计, 试验