As the interest keeps growing on insertion of ceramic matrix composites for engineering use, the effect of defects needs to be known. Defective samples were introduced via stopping the polymer infiltration pyrolysis at different number of cycles. Past work by the authors showed that increasing mechanical properties, such as proportional limit and elastic modulus, and physical properties could be correlated with increasing thermal diffusivity (lower defect volume) within the full gauge area of the sample. To extend this work, the effort was expanded into durability testing, specifically, fatigue tests. A limited number of tensile coupons were fully interrogated via micro-focus X-ray CT in the gauge section of the sample. After interrogation, the samples were fatigue tested at 982°C to failure. The localized effects of the defects on the performance will be presented.
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