Skip to main content

Research Repository

See what's under the surface

Investigation of the mixed-mode delamination in polymer-matrix composites using acoustic emission technique

Fotouhi, Mohamad; Ahmadi Najafabadi, Mehdi

Authors

Mehdi Ahmadi Najafabadi



Abstract

© The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav. This paper is a novel application of acoustic emission (AE) technique to investigate the actual occurring modes of delamination damage (i.e. mode I, mode II and the combination of these pure modes) in glass/epoxy composites. AE parameters and mechanical information associated with some novel methodologies were used to develop new AE-based approaches for studying delamination damage. The inter-laminar fracture energy for the initiation of delamination, Gc, was also measured using the novel introduced methods and standard methodologies. The results indicate that different interface lay-ups and different GII/GT modal ratio values indicate different AE signals and mechanical behaviors. Scanning electron microscope was also used to observe the induced damage mechanisms. It was found that the presented methods of employing AEs to characterize delamination damage and to obtain Gc were successful, especially in mode II and mixed-mode conditions where unstable crack growth and difficult crack growth monitoring prohibit a rigorous measurement of Gc. The results of this study could lead to improve automatic techniques for health monitoring of the real composite structures.

Journal Article Type Article
Publication Date Jan 1, 2014
Journal Journal of Reinforced Plastics and Composites
Print ISSN 0731-6844
Electronic ISSN 1530-7964
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 33
Issue 19
Pages 1767-1782
APA6 Citation Fotouhi, M., & Ahmadi Najafabadi, M. (2014). Investigation of the mixed-mode delamination in polymer-matrix composites using acoustic emission technique. Journal of Reinforced Plastics and Composites, 33(19), 1767-1782. https://doi.org/10.1177/0731684414544391
DOI https://doi.org/10.1177/0731684414544391
Keywords composite materials, acoustic emission, fracture energy, delamination, fractography
Publisher URL http://dx.doi.org/10.1177/0731684414544391