Investigation of failure mechanisms in aged aerospace composites

Fox, Bronwyn, Lowe, Adrian and Hodgkin, Jonathan 2004, Investigation of failure mechanisms in aged aerospace composites, Engineering failure analysis, vol. 11, no. 2, pp. 235-241.

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Title Investigation of failure mechanisms in aged aerospace composites
Author(s) Fox, Bronwyn
Lowe, Adrian
Hodgkin, Jonathan
Journal name Engineering failure analysis
Volume number 11
Issue number 2
Start page 235
End page 241
Publisher Pergamon
Place of publication London, England
Publication date 2004-04
ISSN 1350-6307
1873-1961
Keyword(s) composite
ageing
FTIR
delamination
bismaleimide
Summary The effect of isothermal ageing on two high temperature, bismaleimide composite materials, a novel CSIRO CBR 320/328 composite and a commercial CIBA GEIGY Matrimid® 5292 composite, was examined at 204 and 250 °C. Delamination is a major cause of failure in composite materials, therefore, the Mode I interlaminar fracture toughness (GIC) of both materials was measured using the double cantilever beam (DCB) test. Chemical degradation of the matrix was monitored concurrently using Fourier transform infrared (FTIR) and Raman spectroscopy. Chemical changes at the core of both of these materials were found to occur concomitantly with the observed changes in interlaminar fracture toughness. FTIR analysis of both matrix materials revealed the predominant degradation mechanism to be the oxidation of the methylene group bridging two aromatic rings common to the structure of both resins, and was substantiated by the ingrowth of a broad peak centred at 1600 cm−1 . In addition to this, the pyromellitic anhydride unit present only in the CBR 320/328 composites was found to be highly resistant to the effects of ageing, whereas the saturated imide, common to the cured structures of both materials, was observed to degrade. Raman spectroscopy indicated that the predominant degradation mechanism of the composites differed at the two ageing temperatures.
Language eng
Field of Research 091202 Composite and Hybrid Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, Elsevier Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30004407

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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