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Subcritical Crack Growth in Lead Zirconate Titanate
Author(s) -
Oates William S.,
Lynch Christopher S.,
Lupascu Doru C.,
Njiwa Alain B. Kounga,
Aulbach Emil,
Rödel Jürgen
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2004.tb07736.x
Subject(s) - materials science , lead zirconate titanate , relative humidity , composite material , fracture toughness , stress intensity factor , humidity , stress (linguistics) , fracture mechanics , ferroelectricity , dielectric , thermodynamics , linguistics , philosophy , physics , optoelectronics
Subcritical crack growth in terms of velocity–stress intensity factor ( v – K ) curves in lead zirconate titanate (PZT) were experimentally characterized on poled and unpoled compact tension specimens. The poled specimens were tested under open‐ and short‐circuit electrical boundary conditions, which resulted in an increase in fracture toughness by 0.2 MPa·m 1/2 for the accessible velocity range ( v = 10 −9 to 10 −4 m/s) in the open‐circuit case. Subcritical crack growth of unpoled specimens was obtained under ambient (relative humidity = 35%) and dry (relative humidity ∼ 0.02%) conditions over a regime in stress intensity factor of 0.5 MPa·m 1/2 .