Fatigue crack growth resistance of unidirectional fiber-reinforced titanium metal-matrix composites under transverse loading

X. Wu, P. Bowen

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The transverse fatigue crack growth resistance of unidirectional 8 and 35 pct 1140+/Ti-6-4 fiber-reinforced composites has been investigated. It has been found that, at a low fiber volume fraction, the transverse fatigue crack growth resistance of metal-matrix composites (MMCs) is improved with respect to the monolithic matrix alloy. This occurs because `holes' from debonded interfaces can trap the crack and reduce the average fatigue crack growth rates by periodically increasing the effective crack-tip radius. However, an increase of fiber volume fraction from 8 to 35 pct decreases the fatigue crack growth resistance dramatically, due to the significant increase of the frequency of interaction and coalescence between the main crack, the debonded interfaces, and microcracks.

Original languageEnglish
Pages (from-to)2083-2092
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number8
Publication statusPublished - 1 Jan 2000

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