Fatigue Crack Propagation under Combined Cyclic Mechanical Loading and Electric Field in Piezoelectric Ceramics

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  • 圧電セラミックスにおける繰返し荷重および直流電界重畳下での疲労き裂進展挙動
  • アツデン セラミックス ニ オケル クリカエシ カジュウ オヨビ チョクリュウ デンカイ チョウジョウ カ デ ノ ヒロウ キレツ シンテン キョドウ

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Fatigue crack propagation tests of PZT specimens were performed under cyclic four-point bending with and without superposition of electric fields. The specimens were poled in the longitudinal direction (PL specimens) perpendicular to the crack plane. The crack propagation rate for the case of open circuit was faster than that for the case of short circuit. The application of a negative or positive electric field parallel to the poling direction accelerated the crack propagation rate, and the amount of acceleration was larger for the case of the negative field. The change of the crack propagation rate with crack extension can be divided into three regions. In the region I, the crack propagation rate decreases with increasing crack length, and then turn to increase in the region III. In the region II, the propagation rate is nearly constant. The mechanisms of fatigue crack propagation were correlated to domain switching near the crack tip. The grain boundary fracture was predominant in the low-rate region, while transgranular fracture became abundant on the unstable fracture surface.

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