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Abstract

The strength distribution of SiC fibers has been measured after chemical extraction from a titanium-alloy matrix composite both in the as-consolidated state and after heat-treatment at 950°C for 430 hours. The strength and fracture mode of fibers extracted from the as-consolidated composite was comparable to that of virgin fiber. However, fibers from the heat-treated composite demonstrated lower tensile strength and fractured from surface flaws created by chemical reaction between the fiber and matrix. A fracture mechanics analysis of the relationship between the size of these surface flaws and fiber tensile strength enabled the calculation of the fiber fracture toughness (2.2 MN V4). The validity of this toughness value for internally-initiated tensile failures was verified by comparison of observed and predicted flaw sizes.

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The Effect of Surface Flaws on SiC Fiber Strength in an SiC/Ti-Alloy Composite

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