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Investigation of orientation effects on the electro-mechanical coupling behavior of 1-3 piezoelectric composites under compression

机译：取向对1-3压电复合材料在压缩状态下机电耦合行为的影响

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摘要

The electro-mechanical responses of 1-3 piezoelectric composites with PZT5A1 fibers embedded in an epoxy matrix are investigated under compressive loading. When the applied loading direction is not parallel to the polarization and fiber directions of the PZT fibers, the corresponding electrical and mechanical responses can be dramatically affected. Here both experimental testing and theoretical modeling are carried out to study such orientation effects on 1-3 piezoelectric composites. The testing results indicate that, as the loading direction changes from 0 degrees, to 30 degrees, 45 degrees, 60 degrees and finally 90 degrees to the initial poling direction ( which is also the PZT fiber direction), the magnitude of the electric displacement and mechanical strain of the system all decrease and the electrical response will diminish to zero at 90 degrees. On the other hand, a two-level micromechanics theory based on irreversible thermodynamics and the physics of domain switching is applied to predict such orientation dependency of the electro-mechanical coupling behavior of the composite system. The first level is based on PZT fibers only which consist of parent and switched domains due to external loading, and the second level is based on a larger scale consisting of PZT fibers and an electrically inactive polymer matrix. The theoretical results are found to be in reasonable agreement with our experimental data.
机译：研究了在压缩载荷下，PZT5A1纤维嵌入环氧树脂基体中的1-3压电复合材料的机电响应。当施加的负载方向与PZT光纤的偏振方向和光纤方向不平行时，相应的电气和机械响应会受到显着影响。在这里，通过实验测试和理论建模来研究这种取向对1-3压电复合材料的影响。测试结果表明，随着加载方向从0度变为初始极化方向（也是PZT纤维方向）的30度，45度，60度以及最后90度，电位移的大小和系统的机械应变全部减小，电响应在90度时将减小为零。另一方面，基于不可逆热力学和域转换物理学的二级微观力学理论被用于预测复合系统的机电耦合行为的这种取向依赖性。第一级基于仅PZT纤维，由于外部负载，PZT纤维由母域和交换域组成;第二级基于更大的规模，由PZT纤维和非电活性聚合物基质组成。理论结果与我们的实验数据基本吻合。

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