In-Plane Fracture Resistance of a Crossply Fibrous Monolith

The in‐plane fracture resistance of a crossply Si3N4/BN fibrous monolith in the 0°/90° and ±45° orientations is examined through tests on notched flexure specimens. The measurements and observations demonstrate the importance of fiber pullout following fiber fracture. The mechanical response is mode...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2001-02, Vol.84 (2), p.367-75
Main Authors: McNulty, John C., Begley, Matthew R., Zok, Frank W.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
crack bridging
Exact sciences and technology
fibers
fracture mechanics/toughness
Structural ceramics
Technical ceramics
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Summary:The in‐plane fracture resistance of a crossply Si3N4/BN fibrous monolith in the 0°/90° and ±45° orientations is examined through tests on notched flexure specimens. The measurements and observations demonstrate the importance of fiber pullout following fiber fracture. The mechanical response is modeled using a crack‐bridging approach. Two complementary approaches to evaluating the bridging law are developed: one based on a micromechanical model of fiber pullout and the other based on the load versus crack mouth opening displacement response of the flexure specimens following fracture of all fibers. Both approaches indicate that the bridging law follows an exponential form, characterized by a bridging strength and an effective pullout length. An assessment of the bridging model is made through comparisons of simulations of the load–displacement response with those measured experimentally.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2001.tb00664.x