Deterioration of the fire structural resistance of sandwich composite under tension due to water absorption

Article

Anjang, A., Chevali, V. S., Feih, S. and Mouritz, A. P.. 2016. "Deterioration of the fire structural resistance of sandwich composite under tension due to water absorption." Composites Part A: Applied Science and Manufacturing. 87, pp. 263-270. https://doi.org/10.1016/j.compositesa.2016.05.008
Article Title

Deterioration of the fire structural resistance of sandwich composite under tension due to water absorption

ERA Journal ID4882
Article CategoryArticle
AuthorsAnjang, A. (Author), Chevali, V. S. (Author), Feih, S. (Author) and Mouritz, A. P. (Author)
Journal TitleComposites Part A: Applied Science and Manufacturing
Journal Citation87, pp. 263-270
Number of Pages8
Year2016
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN1359-835X
1878-5840
Digital Object Identifier (DOI)https://doi.org/10.1016/j.compositesa.2016.05.008
Web Address (URL)http://www.sciencedirect.com/science/article/pii/S1359835X16301269
Abstract

The effect of water absorption on the fire structural resistance of a sandwich composite is investigated. A sandwich material consisting of E-glass/vinyl ester laminate skins and balsa wood core was environmentally aged in hot (70 °C) and humid (85% relative humidity) conditions for an increasing period up to and exceeding the saturation time. The face skins displayed Fickian diffusion behaviour in the absorption of water whereas the core exhibited significant mass loss due to water causing hydrolysis of bioorganic compounds in the wood. Water absorption decreased the fire structural resistance of the sandwich composite under tensile loading. The saturated sandwich composite exposed to fire failed at lower tensile stresses and within shorter times compared to the dry composite. The reduction in fire resistance was primarily due to moisture-induced weakening of the laminate skins. The reduction to the fire structural resistance caused by water absorption was predicted using a thermal–mechanical model.

KeywordsA. Sandwich structures; B. Environmental degradation; B. Thermomechanical; Fire
ANZSRC Field of Research 2020400202. Automotive engineering materials
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Byline AffiliationsRoyal Melbourne Institute of Technology (RMIT)
Centre of Excellence in Engineered Fibre Composites
Institution of OriginUniversity of Southern Queensland
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