Uniaxial Tensile Strength and Flaw Characterization of SiC-N

Report No. ARL-TR-6794
Authors: Jared C. Wright; Jeffrey J. Swab
Date/Pages: January 2014; 48 pages
Abstract: Large blocks (10.8 × 29.4 × 39 cm3) of SiC-N composition were manufactured by BAE Systems (now CoorsTek Vista Operations) using their proprietary pressure-aided densification process. Quasi-static tensile strength was determined using cylindrical uniaxial tension specimens oriented either parallel or perpendicular to the densification direction. Fractography, using a combination of optical and scanning electron microscopy, identified three critical flaw populations: machining damage, agglomerates, and inclusions. The material exhibited a low Weibull modulus and characteristic strength compared to historical data. Two tensile specimen sizes were employed for strength-size scaling analysis yielding strength data as a function of effective volume. Strength-size scaling analysis, though performed, was hampered by the low Weibull modulus and the presence of multiple flaw populations.
Distribution: Approved for public release
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Last Update / Reviewed: January 1, 2014