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R ‐Curve for a Lead Zirconate Titanate Ceramic Obtained from Tensile Strength Tests with Knoop‐Damaged Specimens
Author(s) -
Fett Theo,
Munz Dietrich
Publication year - 2000
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.1151-2916.2000.tb01704.x
Subject(s) - knoop hardness test , materials science , lead zirconate titanate , ultimate tensile strength , composite material , ceramic , toughness , piezoelectricity , microstructure , indentation hardness , ferroelectricity , dielectric , optoelectronics
A procedure was used that made it possible to determine the R ‐curve for piezoelectric ceramics from tensile strength tests conducted with Knoop‐damaged specimens. The resulting crack‐tip toughness K I0 was 0.6 MPa·m 1/2 , and the R ‐curve starting from this value increased to 1.4 MPa·m 1/2 within a 0.7 mm crack extension.