Thermal stability and flammability characteristics of phenolic syntactic foam core sandwich composites

Kumar S J, Amith and Kumar S J, Ajith and Nagaraja K, Bharath (2020) Thermal stability and flammability characteristics of phenolic syntactic foam core sandwich composites. Journal of Sandwich Structures and Materials. pp. 1-16. ISSN 1099-6362

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Abstract

Polymeric foam core sandwich composites are the nascent materials used in marine and aerospace structural applications for its low-density characteristics. A special class of foam called syntactic foam is one of the promising core material having high specific properties. However, these polymeric foam core sandwich composite structures may encounter problems in correlation with temperature and fire. Damages that happen due to the variation in temperature and by the catch of fire are sometimes imperceptible which may lead to the deterioration of load carrying ability or catastrophic failure of these composite structures. Present investigation is focused on the possibilities of reducing the extent of damages due to variation in temperature and by the catch of fire by enhancing its thermal stability and flame resistance characteristics. This was achieved from the development of syntactic foam by embedding hollow micro-spherical particles in phenolic resin for fire containment or fire isolation. Result of the experimentation reveals that the phenolic syntactic foam core was thermally more stable than glass/ epoxy face skins up to a temperature of 450C. The minimum concentration of oxygen required for burning was found to be 30%, in which phenolic syntactic foam core helps in flame isolation, whereas E-glass/epoxy face skins contribute to flame spread in the event of burning of sandwich composites. Improved thermal stability and fire resistance characteristics of developed sandwich composites are attributed to the phenolic syntactic foam core and by its orientation.

Item Type: Article
Uncontrolled Keywords: Syntactic foam, sandwich, thermal stability, flame index, limiting oxygen index
Subjects: Hotel Management > WGSHA Manipal
Depositing User: WGSHA EPrints Administrator
Date Deposited: 12 Jan 2021 10:58
Last Modified: 12 Jan 2021 10:58
URI: http://eprints.manipal.edu/id/eprint/156287

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