压电纤维复合材料有限元模拟及其试验研究

考虑压电纤维复合材料(MFC)压电陶瓷纤维层和指间交叉电极设计,假定压电陶瓷纤维极化方向相同,设置递进的电压边界条件,建立MFC均匀压电层等效有限元模型,借助ANSYS-APDL软件进行结构-压电耦合场仿真,模拟其工作的真实变形;同时进行自由应变和阻滞力的数值测试,数值上验证了有限元模型,修正纤维纵向压电应变常数d_(33)。对含有MFC驱动器的铝合金悬臂梁进行数值和试验研究,验证了该模型的准确性。与细观尺度上的MFC有限元模型相比,该有限元模型节约了计算成本,可应用于实际工程中。结果表明,MFC激励法用于振动特性分析时,操作简单,重复性好,信噪比高。

Finite Element Simulation and Experimental Study on Macro Fiber Composite

Considering the designs of the piezoelectric ceramic fiber layer using the macro fiber composite (MFC) material and the interdigitated electrodes, assuming that the piezoelectric ceramic fiber has the same polarization direction and setting the progressive voltage boundary conditions, the equivalent finite element model with MFC uniform piezoelectric layer has been established in this paper. The simulation of the structure piezoelectric coupling field is carried out by ANSYS APDL software to simulate the real deformation in its operation. At the same time, the numerical test of the free strain and blocking force is carried out to verify the finite element model numerically and modify the longitudinal piezoelectric strain constant d33 of the fiber. The accuracy of the model is verified by the numerical and experimental studies on the aluminum alloy cantilever beam with MFC actuator. Compared with MFC finite element model on the mesoscale, the proposed finite element model saves the calculation cost and can be applied to practical engineering. The experimental results show that the MFC excitation method has the features of simplicity for operation, good repeatability and high signal to noise ratio when used for vibration characteric analysis.