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Evaluation of failure behavior of fusion-grade SiC/SiC composites by acoustic emission

Nozawa, Takashi; Ozawa, Kazumi; Tanigawa, Hiroyasu

One of big advantages to utilize fusion-grade SiC/SiC composites is to obtain quasi-ductility by fiber pullouts at the fiber/matrix (F/M) interface. This study primarily aims to identify the detailed failure process of this class of composites by the acoustic emission technique. Specifically, the first attempt of the wavelet analysis is enable to evaluate the time-dependent behavior of AE response during the failure process. Test results show the crack initiation below the proportional limit stress in the stress vs. strain curve, followed by non-linear behavior by sliding at the proportional limit. The strong interfacial bonding and friction due to the rough fiber surface of the fusion-grade SiC/SiC composites sustain load even after matrix cracking until the load achieved the proportional limit and this is totally different from the behavior of the conventional weak interface composites.

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