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Strength knock-down assessment of porosity in composites: modelling, characterising and specimen manufacture

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

McMillan, A, Archer, E, McIlhagger, AT and Lelong, G (2012) Strength knock-down assessment of porosity in composites: modelling, characterising and specimen manufacture. Journal of Physics: Conference Series , 382 . [Journal article]

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DOI: 0.1088/1742-6596/382/1/012027

Abstract

Porosity and inclusion of foreign material is known to reduce the strength of materials, and this paper addresses the particular problem of strength knock-down assessment due to porosity in composite materials. Porosity is often measured in terms of percentage of voids per unit volume of a component, because this can be related directly to ultra-sound absorption. Nevertheless, this is a poor indicator of actual strength knock-down, as it provides little information about void size, shape, orientation and whether they are evenly distributed or are clustered. Characterisation of void clustering enables a link between a cluster characteristic and the strength knock-down. Laboratory based testing achieves controlled porosity in specimens by introducing pin-holes into the RTM in-flow pipework, which entrains voids into the body of the preform within mould tooling. Specimens are manufactured to create resin regions bounded by a fibre reinforced picture frame, to allow for easy load application. Strength knock-downs from test are related to the theoretical expectations.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Engineering Composites
ID Code:23256
Deposited By:Dr Edward Archer
Deposited On:12 Sep 2012 11:35
Last Modified:12 Sep 2012 11:35

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