Splitting of neutral mechanical plane of conformal, multilayer piezoelectric mechanical energy harvester
Splitting of neutral mechanical plane of conformal, multilayer piezoelectric mechanical energy harvester
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DOI：
10.1063/1.4927677
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发表时间：
2015-07
影响因子：
4
通讯作者：
Yewang Su;Shuang-yue Li;Rui Li;C. Dagdeviren
中科院分区：
文献类型：
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作者：
Yewang Su;Shuang-yue Li;Rui Li;C. Dagdeviren
柔性压电机械能量采集器（MEH）作为传统压电器件的一种重要新兴变体，近年来备受关注。多层MEH之间的粘合剂堆叠的设计是提高发电量的有效途径。在这里，我们提出了一个分析模型来研究的力学行为的多层MEHs的锆钛酸铅（PZT）的基础上进行欧拉屈曲。不同于整个叠层的平截面假设，发现每个聚酰亚胺（PI）层保持其自身的平截面，而软粘合剂充当剪切滞后。因此，中性机械平面被分成多个。每个PI层以及PZT阵列的变形几乎相同，这非常有利于避免器件的过早失效。通过建立统一的分析模型，定量地描述了各种极端情况以及这些极端情况之间的过渡过程，并通过有限元方法进行了验证。得到了一个表征多层PZT微电极中性力学面分裂程度的无量纲参数，这对多层PZT微电极的设计具有重要意义。
Flexible piezoelectric mechanical energy harvesters (MEHs) are of recent interest as an important emerging variant of traditional piezoelectric devices. The design of stacking multilayer MEHs with adhesive in between is an effective way to enhance the magnitude of power generation. Here, we present an analytic model to study the mechanical behavior of the multilayer MEHs based on lead zirconate titanate (PZT) subjected to Euler buckling. Being different from the hypothesis of the plane section for the entire stack, it is found that each polyimide (PI) layer holds plane section of its own, while soft adhesives serve as shear lags. Accordingly, the neutral mechanical plane is split into multiple ones. The deformation is almost the same for each PI layer, as well as PZT arrays, which is very beneficial to avoid the premature failure of devices. The extreme cases and the transition of these cases are all captured quantitatively with a unified analytic model which is verified by the finite element method. A dimensionless parameter is obtained to characterize the degree of the splitting of neutral mechanical plane, which is significant for the design of the multilayer PZT MEHs.