Elastic discontinuities during switching of ferroelectric ceramics

Elastic discontinuities during switching of ferroelectric ceramics
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铁电陶瓷切换过程中的弹性不连续性

DOI：
10.1002/1521-396x(200206)191:2
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Hammer
M. Hammer
中科院分区：
--
文献类型：
--
作者：
D. Lupascu;M. Hammer

文献摘要

被引文献

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在铁电材料中，当受到外部载荷时，会遇到几种微观源的弹性不连续。在不同的加载条件下，都会发生磁畴转换、磁畴形核、微裂纹、场诱导晶体相变、带电位错运动和摩擦效应，并产生声发射。比较了三种不同成分的锆钛酸铅在电场作用下的声发射模式。计算了不同声源模型下的声发射幅度，并与实验结果进行了比较。整个实验集允许对该系统进行源分配。简要讨论了利用声发射技术进行疲劳研究的意义。
Several types of microscopic sources of elastic discontinuities are encountered in ferroelectric materials when subject to external loads. Domain switching, domain nucleation, microcracking, field induced crystallographic phase transitions, the motion of charged dislocations and frictional effects each occur under different loading conditions and generate acoustic emissions. Three compositions of lead zirconate titanate are compared for their acoustic emission patterns under electric field driving. Acoustic emission amplitudes are calculated for different source models and compared to experiment. The entire set of experiments allows a source assignment for this system. Implications for fatigue studies using the acoustic emission technique are briefly discussed.