Abstract

The use of piezoelectric nano-fillers in a non-piezoelectric matrix is a very attractive proposition for developing smart nanocomposite materials with desired electro-mechanical properties. The eco-friendly nanowires (NWs) of zinc oxide (ZnO) and gallium nitride (GaN) are the two candidates used to introduce smart piezoelectric nanocomposite materials. Specifically, in this first effort, we examined the electro-mechanical performance of newly developed composite plates reinforced by piezoelectric ZnO NW and GaN NW of varied volume fractions. The static deflections and natural frequencies of the newly developed bimorph piezoelectric nanocomposite plates subject to electro-mechanical loads are analyzed using a mesh-free method in conjunction with the shape functions of MLS. Using third order shear deformation theory (TDST), the coupled electro-mechanical governing equations for the considered smart plates are obtained and numerically integrated. The effects of the electro-mechanical loading and plate thickness on static deflection and natural frequencies of piezoelectric plates are investigated and discussed. Our predictions reveal that the application of electrical input to the plates can induce greater deflection than the ones introduced by mechanical loads and that ZnO NWs offer greater deflection than GaN NW. However, dynamic analysis indicates that GaN NW-reinforced plates have higher natural frequencies than those reinforced by ZnO NW.

摘要

在非压电基体中使用压电纳米填料是开发具有所需机电性能的智能纳米复合材料的一个非常有吸引力的提议。氧化锌 (ZnO) 和氮化镓 (GaN) 的环保纳米线 (NWs) 是用于引入智能压电纳米复合材料的两种候选材料。具体来说，在第一次尝试中，我们检查了新开发的复合板的机电性能，这些复合板由不同体积分数的压电 ZnO NW 和 GaN NW 增强。结合MLS的形函数，使用无网格方法分析了新开发的双晶压电纳米复合板在机电负载下的静态偏转和固有频率。使用三阶剪切变形理论（TDST），获得了所考虑的智能板的耦合机电控制方程并进行了数值积分。研究和讨论了机电载荷和板厚对压电板静态偏转和固有频率的影响。我们的预测表明，向板施加电输入可以引起比机械负载引入的更大的偏转，并且 ZnO 纳米线比 GaN 纳米线提供更大的偏转。然而，动态分析表明，GaN NW 增强板的固有频率高于 ZnO NW 增强板。研究和讨论了机电载荷和板厚对压电板静态偏转和固有频率的影响。我们的预测表明，向板施加电输入可以引起比机械负载引入的更大的偏转，并且 ZnO 纳米线比 GaN 纳米线提供更大的偏转。然而，动态分析表明，GaN NW 增强板的固有频率高于 ZnO NW 增强板。研究和讨论了机电载荷和板厚对压电板静态偏转和固有频率的影响。我们的预测表明，向板施加电输入可以引起比机械负载引入的更大的偏转，并且 ZnO 纳米线比 GaN 纳米线提供更大的偏转。然而，动态分析表明，GaN NW 增强板的固有频率高于 ZnO NW 增强板。