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首页> 外文期刊>Materials Chemistry and Physics >nitiation and propagation of cracks in piezoelectric ring under non-uniform mechanical loading
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nitiation and propagation of cracks in piezoelectric ring under non-uniform mechanical loading

机译：机械载荷不均匀作用下压电环裂纹的萌生和扩展

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摘要

Initiation and propagation of cracks in lead zirconate titanate(PZT) piezoelectric rings under a non-uniform mechanical loading were studied. The PZT ring was sandwiched between two pieces of metals and then compressed by a torque. Bolt clamping produced a non-uniform external stress on the PZT ring and caused various degree of depoling at different positions of the ring. A large torque also initiated cracking and breaking in the ring. Fracture features of the broken PZT ring were observed using scanning electron microscopy (SEM). Fracture toughness at the inner part of the ring changed significantly due to 90° domain rotation after a large torque had been applied.
机译：研究了不均匀机械载荷下锆钛酸铅（PZT）压电环中裂纹的萌生和扩展。将PZT环夹在两块金属之间，然后用扭矩压缩。螺栓夹紧会在PZT环上产生不均匀的外部应力，并在环的不同位置造成不同程度的去极化。较大的扭矩还会导致环破裂和断裂。使用扫描电子显微镜（SEM）观察到断裂的PZT环的断裂特征。施加大扭矩后，由于90°畴旋转，环内部的断裂韧性发生了显着变化。

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