Abstract
The fatigue behavior of a silicon carbide fiber reinforced glass ceramic matrix composite, SiC/CAS subjected to tension-compression cycling was investigated. Two laminate layups were studied: cross-ply, [0/90]25 and unidirectional, [0]16. At first, the fatigue limit based on one million cycles was established for a tension-tension fatigue condition. Then, compression cycling was superimposed on this measured fatigue limit. The addition of this compression loading resulted in the development of longitudinal cracks parallel to the loading direction. This increased the amount of damage and ulti mately led to total specimen failure prematurely. The larger the magnitude of the compres sion cycle, the earlier the development of longitudinal crack occurred and, consequently, the earlier failure occurred. This behavior was due to the inherently poor interfacial bond between matrix and fiber of the tested ceramic matrix composite.
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