Transverse strain response of Hi-Nicalon fiber reinforced silicon nitride matrix composites

Journal Article · Mon Dec 15 04:00:00 EST 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00382-5· OSTI ID:586057

Olivier, C; Veyret, J B ^[1]; Vanswijgenhoven, E; Biest, O van der ^[2]

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1. European Commission, Petten (Netherlands)
2. Catholic Univ. Leuven, Heverlee (Belgium). Dept. of Metallurgy and Materials Engineering

The relation between the longitudinal stress {sigma} and the transverse strain {var_epsilon}{sub tr} during monotonic tension testing of unidirectional fiber toughened ceramic matrix composites (UD-CMCs) has been studied experimentally and theoretically by several authors. Matrix cracking and interface debonding generally causes {var_epsilon}{sub tr} to increase or to become positive. Recently, this has been theoretically explained by a model taking into account the Poisson contraction of fiber and matrix, the redistribution of mechanical stress and the relief of residual thermal strain upon damage development, and the built-up of compressive radical stresses at the interface caused by the radial interfacial mismatch after interface debonding and sliding. In this paper, the {var_epsilon}{sub tr} response of a series of Hi-Nicalon (SiC) fiber reinforced silicon nitride matrix composites is reported and described by a previously developed model. This paper focuses on the extension of the model to composites with a radial gap {delta} after interface debonding, which was necessary to model the present CMC materials.

• OSTI ID: 586057
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 12 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
FAILURES
MECHANICAL TESTS
REINFORCED MATERIALS
SILICON CARBIDES
SILICON NITRIDES