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Abs~ra~-Impregnation and recarbonization effectiveness during the processing of carbon-carbon composites is largely enhanced by subjecting them to intermediate graphitization cycles. The effect of an intermediate graphitization cycle on the fracture toughness of a Z-D C/C composite has been investigated. Two materials have been considered. Both composites are reinforced with plain woven fabrics of carbon yarns, and their matrices are derived from the same resin. The only difference is that one of the composites has undergone an extra intermediate graphitization cycle. Flexural tests were conducted on multiple geometrically identical. un-notched and notched specimens ofeach composite in the translaminar and crosslaminar directions. The current study reveals that an intermediate graphitization has increased the fracture toughness of the C/C composite by about one fold, as measured by both the critical energy release rate at the onset of crack extension, Gr,, and the critical value of the J integral, Jt,. This is accompanied by about a 25% loss in the translaminar flexural strength and a 2% decrease in the translaminar stiffness. A considerable decrease in the notch sensitivity of the

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Author

Heshmat A. Aglan

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-6223)

Published

1993

Language

EN

Field

Materials Science (Physical Sciences)