关键词: 形状记忆合金板, 双程, 弯曲驱动器, 设计, 试验

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