日本機械学会論文集A編
Online ISSN : 1884-8338
ISSN-L : 1884-8338
一般論文
PZT電極縁に沿う短い表面き裂の繰返し電界誘起き裂進展挙動
楠川 量啓高坂 達郎
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ジャーナル フリー

2013 年 79 巻 808 号 p. 1716-1725

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Short crack propagation behavior in poled lead zirconate titanate was examined under cyclic electric loading. A crack located at edge of a partial electrode grew along the electrode edge during the loading. The crack growth rate decreased with increasing crack length until a non-propagating crack was reached. The growth rate and crack length of the non-propagating crack were affected by the amplitude, mean voltage of the electric loading and environment. In the case of high-amplitude loading or negative-biased loading, the crack growth rate varied considerably because of domain switching. At testing temperature of 20°C, moist atmosphere had no effect on the crack propagation behavior. However the crack growth rate fluctuated and non-propagating crack length was increased with increase in temperature to 40°C. Finite element analysis of a three-dimensional permeable crack showed that the mode III stress intensity factor range is independent of crack length, but it decreases as a result of the frictional force under positive electric field. Fracture surface observations showed that intergranular cracking is dominant near the tip of the non-propagating crack.
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