Abstract
A novel technique for measuring interphase recession in ceramic‐matrix composites (CMCs) due to oxidation is described. The technique involves fiber push‐in testing and analysis of the load–displacement curves. Fiber push‐in tests were conducted on carbon‐coated Hi‐Nicalon SiC fibers in a CVI SiC matrix, where the carbon interphase had recessed due to oxidation. Estimates of interphase recession distances from analysis of fiber push‐in tests are in reasonable agreement with measurements made by optical microscopy. Besides measuring the recession distance, the fiber push‐in test can be used to investigate environmental effects on fiber bridging.
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