Study on Electric-Induced Damage in Piezoelectric Ceramics

研究了锆钛酸铅在循环电载荷作用下的小裂纹扩展行为。加载过程中，部分电极边缘的裂纹沿电极边界扩展。裂纹扩展速率随裂纹长度的增加而减小，达到非扩展裂纹。非扩展裂纹的扩展速率和裂纹长度受电载荷幅值和环境温度、湿度的影响。

Small crack growth behavior in poled lead zirconate titanate was investigated under cyclic electric loadings. The crack located at partial electrode edge grew along the boundary of electrode during the loading. The crack growth rate decreased with increasing crack length and non-propagating crack was reached. The growth rate and crack length of non-propagating crack were affected by amplitude of the electric loadings and environmental temperature and humidity.