Kinetics of Moisture Degradation in Graphite-Epoxy Composites

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1974
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Kaelble, David
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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This study forms part of a more general program addressed to developing a better understanding of the mechanisms of interfacial bonding and environmental stability in polymer matrix composites. Several published studies have shown that exposure of graphite fiber reinforced epoxy or polyester composites to water immersion or water vapor at elevated temperature produces decreases in interlaminar shear strength accompanied by rising or falling values of fracture toughness. An approach to the correction of this moisture sensitivity has been suggested by Kaelble based upon a-modified Griffith-Irwin model for interfacial failure and a micro-mechanics model for fracture energy due to fiber debonding.

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