The fiber/matrix interface plays a key role in the toughening mechanisms and overall thermo-mechanical behavior of fiber-reinforced ceramic-matrix composites (CMCs). A debonded fiber/matrix interface induces energy-absorption (i.e., toughening) mechanisms, such as interfacial sliding and fiber pull-out, and consequently results in the graceful, rather than catastrophic, failure of fiber-reinforced CMCs; see, for example, Evans and McMeeking (1986).

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