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Cyclic‐Fatigue Behavior of SiC/SiC Composites at Room and High Temperatures
Author(s) -
Mizuno Mineo,
Zhu Shijie,
Nagano Yasuo,
Sakaida Yoshihisa,
Kagawa Yutaka,
Watanabe Makoto
Publication year - 1996
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.1151-2916.1996.tb08078.x
Subject(s) - materials science , composite material , cyclic stress , ultimate tensile strength , fatigue limit , composite number , chemical vapor infiltration , tension (geology) , fracture (geology) , fiber
Tension‐tension cyclic‐fatigue tests of a two‐dimensional‐woven‐SiC‐fiber‐SiC‐matrix composite (SiC/SiC) prepared by chemical vapor infiltration (CVI) were conducted in air at room temperature and in argon at 1000°C. The cyclic‐fatigue limit (10 7 cycles) at room temperature was ∼160 MPa, which was ∼80% of the monotonic tensile strength of the composite. However, the fatigue limit at 1000°C was only 75 MPa, which was 30% of the tensile strength of the composite. No difference was observed in cyclic‐fatigue life at room temperature and at 1000°C at stresses >180 MPa; however, cyclic‐fatigue life decreased at 1000°C at stresses < 180 MPa. The fracture mode changed from fracture in 0° and 90° bundles at high stresses to fracture mainly in 0° bundles at low stresses. Fiber‐pullout length at 1000°C was longer than that at room temperature, and, in cyclic fatigue, it was longer than that in monotonic tension. The decrease in the fatigue limit at 1000°C was concluded to be possibly attributed to creep of fibers and the reduction of the sliding resistance of the interface between the matrix and the fibers.