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Fracture characteristics of SiC particle reinforced oxynitride glass using chevron-notch three-point bend specimens

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Abstract

The fracture toughness K1c and the effective fracture surface energy γeff, of oxynitride glass (m)/SiC(p) brittle particulate composites were measured by means of stable fracture tests, using chevron-notch three-point bend specimens. In comparison to oxide glasses, the oxynitride glass matrix is noticeably tougher: K1cm = 1.2 MPa.\(\sqrt m\) and γeff = 5 J/m2. The addition of SiC particles, 6 μm in diameter, results in a significant toughening: K1c = 2.5 MPa.\(\sqrt m\) and γeff = 9.1 J/m2 for the composite with 40 vol\% SiC. In such systems, with strong particle-matrix interfacial bonding, and where (Ep, K1cp, σrp) > (Em, K1cm, σrm), the main toughening contribution is due to a discrete pinning of the crack by particles near the crack tip in conjunction to bowing of the crack front between particles, and to a small scale bridging mechanism.

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  1. Université de Rennes 1, campus Beaulieu, 35042, Rennes cedex, France.

    T. Rouxel & Y. Laurent

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  1. T. Rouxel
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  2. Y. Laurent
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Rouxel, T., Laurent, Y. Fracture characteristics of SiC particle reinforced oxynitride glass using chevron-notch three-point bend specimens. International Journal of Fracture 91, 83–101 (1998). https://doi.org/10.1023/A:1007474415485

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