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Piezoelectric behavior of pre-stressed curved actuators under load

机译：负载下预应力弯曲执行器的压电行为

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摘要

Pre-stressed curved actuators typically consist of a piezoelectric ceramic (lead zirconate titanate or PZT) laminated between various layered materials. In one configuration, THUNDER, the bottom layer is stainless steel and the top layer is aluminum; the metallic layers are attached to the PZT ceramic using a polymeric adhesive. In another configuration, Lipca-C2, the layers comprise a glass/epoxy composite and a carbon/epoxy composite. Experimental and numerical results of displacement performance under unloaded conditions have been investigated in the past. The results show that the Lipca-C2 devices produced more displacement than the THUNDER devices when clamped and unloaded. The present study includes a comparative performance of both devices under load to evaluate their lifting capability. Both out-of-plane and in-plane displacements are assessed as a function of load and voltage at low frequency. A non-contact laser was used for the out-of-plane measurements simultaneously with an optic fiber for in-plane displacement at 0 to 5N load values. The load is attached to one end of the actuators, and to avoid possible damage to the actuators, it is moved through a mechanism that utilizes a frictionless linear bearing and a pulley.
机译：预应力弯曲执行器通常由层压在各种分层材料之间的压电陶瓷（锆钛酸铅或PZT）组成。在一种配置中，THUNDER，底层是不锈钢，顶层是铝。使用聚合物粘合剂将金属层连接到PZT陶瓷上。在另一种配置中，Lipca-C2，这些层包括玻璃/环氧树脂复合物和碳/环氧树脂复合物。过去已经研究了在空载条件下位移性能的实验和数值结果。结果表明，在夹紧和卸载时，Lipca-C2设备产生的位移比THUNDER设备更大。本研究包括两种设备在负载下的比较性能，以评估其提升能力。平面外和平面内位移均作为低频下负载和电压的函数进行评估。非接触式激光与光纤同时用于平面外测量，以在0至5N负载值下进行平面内位移。负载连接到执行器的一端，为避免对执行器造成可能的损坏，负载通过使用无摩擦线性轴承和滑轮的机构移动。

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