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Rate of Strength Decrease of Fiber‐Reinforced Ceramic‐Matrix Composites during Fatigue
Author(s) -
Sørensen Bent F.,
Holmes John W.,
Vanswijgenhoven Eddy L.
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.tb01412.x
Subject(s) - materials science , composite material , calcium aluminosilicate , ultimate tensile strength , embrittlement , ceramic matrix composite , composite number , fiber , ceramic , fracture (geology) , aluminosilicate , residual strength , matrix (chemical analysis) , biochemistry , chemistry , catalysis
An experimental investigation was performed to study the rate at which strength‐controlling fatigue damage evolves in a ceramic‐matrix composite. Tensile specimens of a unidirectional SiC‐fiber‐reinforced calcium aluminosilicate matrix composite were cycled to failure or to a preselected number of cycles under similar loading histories. The residual strength of the precycled specimens was found to be similar to that of virgin specimens. Microstructural investigations showed that the fracture surfaces of the specimens cycled to failure had a central region where fiber pullout was negligible. It is proposed that frictional heating (due to interfacial sliding) is the cause of fatigue failure. High interfacial temperatures are assumed to cause the formation of a strong interface bond, leading to internal embrittlement.