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1 August 2003 Acousto-ultrasonic characterization of C/SiC composites under different loading configurations
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Strong, lightweight, temperature-resistant ceramic matrix composite (CMC) materials such as carbon fiber reinforced silicon carbide (C/SiC) are being developed for use in reusable launch vehicles. C/SiC coupons were developed to investigate damage behavior due to tensile and fatigue testing. In order to describe the nature of damage in this material a nondestructive evaluation technique that can detect damage progression is necessary. This study determines acousto-ultrasonics’ (AU) capabilities and limitations for the detection of damage in these composites. AU parameters were evaluated for two sets of C/SiC coupons prior to interrupted fatigue testing. In addition, a single coupon was tested with two different loading configurations. The statistical significance of several AU parameters is determined for characterizing this composite material. Ten AU waveforms were collected along the gauge length of the C/SiC coupons prior to tensile and fatigue testing. Three operators collected the waveforms from each set of coupons to check repeatability. These waveforms were processed with an analysis routine that calculates AU parameters such as ultrasonic decay rate, the first moment of the power spectrum (M0), and the centroid of the power spectrum (fc). The results will recommend the most repeatable AU parameters and loading configuration for future evaluation of C/SiC components.
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Laura M. Cosgriff, Richard E. Martin, and George Y. Baaklini "Acousto-ultrasonic characterization of C/SiC composites under different loading configurations", Proc. SPIE 5046, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites II, (1 August 2003);

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