Electrical Resistance as a Nondestructive Evaluation Technique for SiC/SiC Ceramic Matrix Composites Under

SiC/SiC ceramic matrix composites under creep-rupture loading accumulate damage by means of local matrix cracks thattypically form near a stress concentration, such as a 901 fiber tow or a large matrix pore, and grow over time. Such damage isdifficult to detect through conventional techniques. This study demonstrates that electrical resistance is a viable method ofmonitoring and inspecting damage in SiC/SiC composites at high temperature. Both interrupted and uninterrupted creep-rupture experiments were performed at 13151C and 110MPa with in situ resistance measurements. A linear relationship wasfound between resistance and cumulative crack depth.