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RESEARCH PAPERS

Tensile Behavior of Glass/Ceramic Composite Materials at Elevated Temperatures

[+] Author and Article Information
J. F. Mandell, D. H. Grande, J. Jacobs

Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Eng. Gas Turbines Power 109(3), 267-273 (Jul 01, 1987) (7 pages) doi:10.1115/1.3240035 History: Received February 05, 1987; Online October 15, 2009

Abstract

This paper describes the tensile behavior of high-temperature composite materials containing continuous Nicalon ceramic fiber reinforcement and glass and glass/ceramic matrices. The longitudinal properties of these materials can approach theoretical expectations for brittle matrix composites, failing at a strength and ultimate strain level consistent with those of the fibers. The brittle, high-modulus matrices result in a nonlinear stress-strain curve due to the onset of stable matrix cracking at 10 to 30 percent of the fiber strain to failure, and at strains below this range in off-axis plies. Current fibers and matrices can provide attractive properties well above 1000°C, but composites experience embrittlement in oxidizing atmospheres at 800 to 1000°C due to oxidation of a carbon interface reaction layer. The oxidation effect greatly increases the interface bond strength, causing composite embrittlement.

Copyright © 1987 by ASME
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