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Tension–Tension Fatigue Behavior of Nextel TM 720/Alumina under Combustion Environment
Author(s) -
Mall Shankar,
Nye Andrew R.,
Jefferson George
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2011.02625.x
Subject(s) - materials science , combustion , ultimate tensile strength , fatigue limit , composite material , tension (geology) , chemistry , organic chemistry
Fatigue behavior of Nextel720 ™ /alumina was investigated under combustion environment, which was then compared with that in laboratory environment. Fatigue strength for 90,000 cycles was equal to 150 MPa under combustion condition, while 170 MPa in laboratory environment. However, normalized fatigue strength (ratio of fatigue strength and ultimate tensile strength) was equal in combustion and laboratory environments. The difference in fatigue strength was due to thermal stresses from impingement of combustion flame on one side of specimen. Fractographic analysis showed that combustion had little effect on fiber/matrix bonding in only flame impingement region. Combustion environment was not thus damaging to Nextel720 ™ /alumina.