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首页> 外文期刊>Ferroelectrics: Letters Section >Anisotropy of Indentation Cracks Propagation of PZT-5H Ferroelectric Ceramice in Air and Water under Sustained Load
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Anisotropy of Indentation Cracks Propagation of PZT-5H Ferroelectric Ceramice in Air and Water under Sustained Load

机译：持续载荷下PZT-5H铁电陶瓷在空气和水中压痕裂纹扩展的各向异性

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摘要

The propagation process and the anisotropy of the indentation cracks of poled PZT-5H ferroelectric ceramics in air and water under sustained load were investigated using Vickers indentation equipment. It is found that the length of the indentation cracks increasedwith increasing time to keep indentation load in air and water, thus, sub-critical crack growth or stress corrosion cracking (SCC) under sustained load occurred. For the cracks parallel to the poling direction, the threshold stress intensity factor for cracks arrest, K_(ISCC), is larger, whereas the crack propagation rate, da/dt, is smaller than those for the cracks perpendicular to the poling direction. The anisotropy of susceptibility to SCC is related to the anisotropy of fracture toughness. The larger the fracture toughness is, the more susceptibility to SCC is, that is, the smaller the K_(ISCC) is, the larger the da/dt is.
机译：利用维氏压痕仪研究了PZT-5H极化铁电陶瓷在空气和水中在持续载荷下的压痕裂纹的扩展过程和各向异性。研究发现，压痕裂纹的长度随保持空气和水中压痕载荷的时间的增加而增加，因此，在持续载荷下，亚临界裂纹的出现或应力腐蚀裂纹的发生。对于平行于极化方向的裂纹，其阈值应力强度因子K_（ISCC）较大，而裂纹扩展速率da / dt小于垂直于极化方向的裂纹。 SCC敏感性的各向异性与断裂韧性的各向异性有关。断裂韧性越大，对SCC的敏感性越大，即，K_（ISCC）越小，da / dt越大。

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