Abstract
Piezo-electric ceramics, PZT, are used as actuators in mechanical structures, therefore the log-term reliability of actuators is required. PZT has three types of crystal structure, tetragonal, Rhombohedral, structure and MPB by difference of chemical compositions. In addition, there are two types of PZT(hard and soft) by added element. In this study, 4-point bending tests of the above six type of PZTs were conducted. Bending strength and fatigue crack propagation behaviors were investigated. Fatigue crack propagation rate could be divided into three regions, Region I II and III. Region I is the region where crack propagation rate decreased. Region II is the minimum constant rate region. Region III is the acceleration region. In Region III of high crack propagation rate, crack propagation rates for three crystalline structures obey the Paris's law.
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