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Fracture of Ferroelectric Materials Interfacial Fatigue Crack Propagation Driven by Piezoelectric Actuators

机译:压电致动器驱动的铁电材料骨折与界面疲劳裂纹传播

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This work stems from a novel, high frequency fatigue testing technique for adhesive-metal interface crack growth using a piezoelectric actuator. It consists of several parts. (i) We obtained a general solution to an interfacial crack between a piezoelectric and an elastic material under in-plane electric loading which predicted a special type of singular electric field and electric displacement that could induce 90° domain switching and affect the crack behavior. (ii) We performed experiments to investigate the mechanisms responsible for the nonlinearity and ferroelectric fatigue of PZT-5H. Our in-situ x-ray diffraction experiments on freshly poled, depolarized, and electrically fatigued PZT samples provided direct evidence that non-180° domain switching and phase transition are the main mechanisms responsible for the nonlinearity of the material.
机译:这项工作源于使用压电致动器的粘合金属界面裂纹生长的新颖,高频疲劳试验技术。它由几个部分组成。 (i)我们在平面内电荷下的压电和弹性材料之间的界面裂缝中获得了一般的解决方案,这预测了一种特殊类型的奇异电场和电动位移,可以诱导90°域切换并影响裂缝行为。 (ii)我们进行了实验,以研究负责PZT-5H的非线性和铁电疲劳的机制。我们的原位X射线衍射实验在新抛光,去极化和电疲劳的PZT样品中提供了直接证据,即非180°域切换和相变是负责材料非线性的主要机制。

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