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Propagation Process of Indentation Cracks in Air and Water Under a Sustained Load for PZT-5 Ferroelectric Ceramics |
HUANG Haiyou; CHU Wuyang; SU Yanjing; GAO Kewei; QIAO Lijie |
Department of Materials Physics;University of Science and Technology Beijing; Beijing 100083 |
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Cite this article:
HUANG Haiyou; CHU Wuyang; SU Yanjing; GAO Kewei; QIAO Lijie. Propagation Process of Indentation Cracks in Air and Water Under a Sustained Load for PZT-5 Ferroelectric Ceramics. Acta Metall Sin, 2004, 40(9): 962-966 .
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Abstract The propagation processes of indentation cracks in air and water under a sustained load for
a PZT-5 ferroelectric ceramics have been investigated. The results show that the indentation
cracks could propagate in air and water and arrest after about 120 h. As
a result, the crack propagation
rates and threshold stress intensity factors for crack arrest in air and water were obtained, and
revealed anisotropy. The anisotropy of susceptibility to stress corrosion cracking is relative to the
anisotropy of the fracture toughness. The fracture toughness of the crack perpendicular to the
poling direction is smaller than that parallel to the poling direction,
i.e., KcICda/dt.
Stress corrosion cracking in water is more susceptible, i.e.,
da/dt is larger and KISCC is smaller,
than that in air.
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Received: 16 May 2003
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