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Crack Shielding in Ceria‐Partially‐Stabilized Zirconia
Author(s) -
Marshall David B.
Publication year - 1990
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.1151-2916.1990.tb06732.x
Subject(s) - materials science , electromagnetic shielding , cubic zirconia , fracture toughness , composite material , stress intensity factor , shielding effect , toughening , ceramic , toughness , fracture mechanics
The crack tip shielding stress intensity factor has been calculated for several elongated transformation zone shapes observed in high‐toughness ceria‐zirconia ceramics. The results show that the measured increases in fracture toughness of these materials are consistent with the crack tip shielding mechanism, to which the toughening of other zirconia ceramics has been attributed. Moreover, the presence of a very elongated zone ahead of a steady‐state crack is shown to decrease the degree of shielding compared with that of a zone with semicircular frontal shape and equivalent width by a factor of about 2.