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

Fotouhi, M. and 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), pp. 1767-1782. (doi: 10.1177/0731684414544391)

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Abstract

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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fotouhi, Dr Mohammad
Authors: Fotouhi, M., and Ahmadi Najafabadi, M.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Journal of Reinforced Plastics and Composites
Publisher:SAGE Publications
ISSN:0731-6844
ISSN (Online):1530-7964
Published Online:05 August 2014

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