【摘要】In this work, behavior of a unimorph piezoceramic actuator, LIPCA (Lightweight Piezo-Composite Actuator) under compression has been experimentally and numerically investigated. The LIPCA composed of composite laminated tabs, piezoceramic material layer, glass/epoxy composite and carbon fiber composite layers was modeled and analyzed by using a full three-dimensional finite element modeling technique. The geometrically nonlinear analysis was used in the analysis because the LIPCA has the initial curvature due to the curing process, which acts like an initial geometric imperfection. The LIPCA was installed in the simply supported configuration and compressive load was applied in the test jig. By measuring the lateral displacement created by the compressive load, the buckling load of the LIPCA was determined. The measured buckling load agreed well with the computed linear buckling load from the finite element analysis based on the thermal analogy. As various electric fields were applied to the LIPCA under the compressive load, the lateral displacement was measured to examine behavior of the LIPCA under the compressive load and electric field at the same time. From this test, proper combinations of the compressive load and prescribed voltage could be figured out, which can create controlled buckling of the LIPCA under compression by applying the electric field. The measured data showed that the lateral displacement of the LIPCA is significantly increased when a proper electric field is prescribed to the LIPCA in addition to the pre-determined compressive load. The measured data was compared with the computed result from the geometrically nonlinear finite element analysis based on the thermal analogy. The numerical simulation agreed well with the measurement for low compressive load (< 3N) and low electric field (< 150V). The strength of the LIPCA is also calculated to make sure that the actuator can be operated without fracture.
【摘要机译】在这项工作中，已经对单压电陶瓷致动器LIPCA（轻型压电复合致动器）在压缩下的行为进行了实验和数值研究。通过使用完整的三维有限元建模技术，对由复合层压片，压电陶瓷材料层，玻璃/环氧树脂复合材料和碳纤维复合材料层组成的LIPCA进行了建模和分析。在分析中使用了几何非线性分析，因为LIPCA由于固化过程而具有初始曲率，就像初始几何缺陷一样。 LIPCA安装在简单支持的配置中，压缩负载应用于测试夹具。通过测量由压缩载荷产生的横向位移，可以确定LIPCA的屈曲载荷。测得的屈曲载荷与基于热模拟的有限元分析计算出的线性屈曲载荷非常吻合。由于在压缩载荷下向LIPCA施加了各种电场，因此测量了横向位移以同时检查LIPCA在压缩载荷下的行为和电场。通过该测试，可以找出压缩负载和规定电压的适当组合，通过施加电场，可以在压缩下对LIPCA产生可控的屈曲。测量数据表明，除了预定的压缩载荷外，当向LIPCA施加适当的电场时，LIPCA的横向位移会显着增加。将测量的数据与基于热模拟的几何非线性有限元分析的计算结果进行比较。数值模拟与低压缩负载（<3N）和低电场（<150V）的测量非常吻合。 LIPCA的强度也经过计算，以确保执行器可以在不破裂的情况下运行。