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Notch Sensitivity of Ceramic Composites with Rising Fracture Resistance
Author(s) -
Mattoni Michael A.,
Zok Frank W.
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.1551-2916.2004.00914.x
Subject(s) - materials science , composite material , tension (geology) , ceramic , fracture (geology) , enhanced data rates for gsm evolution , compact tension specimen , fracture mechanics , flexural strength , composite number , bending , fracture toughness , sensitivity (control systems) , stress (linguistics) , ultimate tensile strength , crack growth resistance curve , crack closure , telecommunications , linguistics , philosophy , electronic engineering , computer science , engineering
A theoretical framework is developed for the notched strength of ceramic composites that exhibit rising fracture resistance. It is based on established concepts of crack stability under stress‐controlled loadings. On using a linear representation of the resistance curve (expressed in terms of an energy release rate), straightforward analytical solutions are obtained for the strength as well the amount of stable crack growth preceding fracture and the associated fracture resistance. Calculations are performed for several test configurations commonly used for material characterization, including single‐ and double‐edge‐notched tension, center‐notched tension, and single‐edge‐notched bending. The results reveal salient trends in strength with notch length and specimen geometry. An assessment of the theory is made through comparison with experimental measurements on an all‐oxide fiber composite. Transitions in the degree of notch sensitivity with notch length are identified and explored. The utility of the theoretical results both for rationalizing the trends in measured notched strength and for guiding experimental studies of notch sensitivity is demonstrated.