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首页> 外文期刊>Boletin de la Sociedad Espanola de Ceramica y Vidrio >Crack growth during poling and polarisation reversal in commercial piezoceramics
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Crack growth during poling and polarisation reversal in commercial piezoceramics

机译：商业压电陶瓷极化和反转极化过程中的裂纹扩展

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摘要

The growth of Vicker's cracks during the poling ofpiezoelectric ceramics was studied for two PZT basedcompositions with different tetragonal distortion of the perovskitestructure. Studies on the two compositions with different polingelectric fields and similar initial crack lengths showed that crackgrowth was not proportional to the induced stress free longitudinalstrain by 90beg domain reorientation. This observation is notconsistent with the previously proposed mechanism of crackgrowth based on a strain mismatch between the material at thecrack flanks an the rest of the ceramic. This mismatch wasproposed to occur because of the reduction of the electric fieldwithin the crack flanks. The reasons for the disappearance of themismatch are discussed here, and an alternative mechanism ofcrack growth consistent with our results is proposed, which takesinto account the electrically induced stress gradient at the crack tip,produced by the piezoelectric effect. Cracks were also found togrow during a small number of subsequent polarisation reversals,the explanation of which must be due to some other additional effect.
机译：研究了两种不同钙钛矿结构畸变的PZT基复合材料在压电陶瓷极化过程中维氏裂纹的生长。对两种具有不同极化电场和相似初始裂纹长度的成分的研究表明，裂纹增长与90beg域重新定向与诱导的无应力纵向应变不成比例。该观察结果与先前提出的裂纹扩展机理不一致，裂纹扩展机理基于裂纹侧面的材料与其余陶瓷之间的应变不匹配。提出这种不匹配是由于裂纹侧面内的电场减小所致。这里讨论了失配消失的原因，并提出了与我们的结果一致的裂纹扩展的另一种机制，其中考虑了由压电效应产生的裂纹尖端处的电感应应力梯度。在少量随后的极化反转过程中也发现了裂纹，其解释必须归因于其他一些附加效应。

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