Smith W A
ONR, Arlington, VA.
IEEE Trans Ultrason Ferroelectr Freq Control. 1993;40(1):41-9. doi: 10.1109/58.184997.
A simple physical model of 1-3 composite piezoelectrics that was advanced for the material properties relevant to thickness-mode oscillations is extended to address the hydrostatic response. The model is valid when the lateral spatial scale of the composite is sufficiently fine that the composite can be treated as an effective homogeneous medium. Expressions are derived for the composite's material parameters in terms of the volume fraction of piezoelectric ceramic and the properties of the constituent piezoelectric ceramic and passive polymer. The results are similar to those derived by Haun and Newnham (1983, 1986) using a parallel-series connectivity model. The model is illustrated by analyzing composites made from conventional PZT5 and anisotropic modified lead titanate piezoelectric ceramics. For PZT5, the composite structure enhances its hydrostatic charge coefficient, hydrostatic voltage coefficient, hydrophone figure of merit, and hydrostatic coupling coefficient, while three of these quantities fall short of their pure ceramic values in the modified lead titanate composites. The shortfall is due to an enhanced composite that arises from lateral stress on the polymer being transferred to a longitudinal stress along the ceramic rods by the Poisson effect in the polymer, thus producing a charge through the ceramic's d(33).
一个针对与厚度模式振荡相关的材料特性提出的 1-3 复合压电材料的简单物理模型被扩展以处理其流体静压响应。当复合材料的横向空间尺度足够精细以至于可以将复合材料视为有效均匀介质时，该模型有效。根据压电陶瓷的体积分数以及组成压电陶瓷和无源聚合物的特性，推导出了复合材料材料参数的表达式。结果与 Haun 和 Newnham（1983 年、1986 年）使用并联 - 串联连接模型得出的结果相似。通过分析由传统 PZT5 和各向异性改性钛酸铅压电陶瓷制成的复合材料来说明该模型。对于 PZT5，复合材料结构提高了其流体静压电荷系数、流体静压电压系数、水听器品质因数和流体静压耦合系数，而在改性钛酸铅复合材料中，这些量中的三个未达到其纯陶瓷值。这种不足是由于聚合物上的横向应力通过聚合物中的泊松效应转移到沿陶瓷棒的纵向应力而产生的增强复合材料，从而通过陶瓷的 d(33)产生电荷。
