Determination of moisture effects on impact properties of composite materials

E. Woldesenbet, Nikhil Gupta, J. R. Vinson

Research output: Contribution to journalArticle

Abstract

Many applications of structural materials involving composites include impact or dynamic loading in a humid environment. Composite materials are known to degrade when subjected to humid conditions, and therefore the humidity confounds the difficulty of determining the high strain rate behavior of composites. Several researchers have found that water absorption by composites causes degradation of matrix dominated quasi-static properties. However, very little is known of the effect of absorbed moisture on the high strain rate properties of polymer matrix composites, that are useful in the automotive, aerospace, and naval applications of composite structures. A Split-Hopkinson Pressure Bar facility is used herein to study the effect of absorbed moisture in high strain rate tests (200-1200/s) of a unidirectional IM7/8551-7 graphite/epoxy composite. The study includes dry, medium, and saturated moisture conditions. The tests show significant variation of high strain rate properties from static properties, and the reasons are identified. In addition, a better understanding of the effect of the matrix and fiber/matrix interface on the high strain rate properties of composites is achieved.

Original languageEnglish (US)
Pages (from-to)2693-2698
Number of pages6
JournalJournal of Materials Science
Volume37
Issue number13
DOIs
StatePublished - Jul 1 2002

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Strain rate
Moisture
Composite materials
Graphite epoxy composites
Polymer matrix composites
Water absorption
Composite structures
Atmospheric humidity
Degradation
Fibers

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Determination of moisture effects on impact properties of composite materials. / Woldesenbet, E.; Gupta, Nikhil; Vinson, J. R.

In: Journal of Materials Science, Vol. 37, No. 13, 01.07.2002, p. 2693-2698.

Research output: Contribution to journalArticle

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