Characterisation of Damage in Composite Structures using Acoustic Emission

Eaton, Mark Jonathan ORCID: https://orcid.org/0000-0002-7388-6522, May, M., Featherston, Carol Ann ORCID: https://orcid.org/0000-0001-7548-2882, Holford, Karen Margaret ORCID: https://orcid.org/0000-0002-3239-4660, Hallet, S. and Pullin, Rhys ORCID: https://orcid.org/0000-0002-2853-6099 2011. Characterisation of Damage in Composite Structures using Acoustic Emission. Journal of Physics: Conference Series 305 (1) , 012086. 10.1088/1742-6596/305/1/012086

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Abstract

Detection and characterisation of damage in composite structures during in-service loading is highly desirable. Acoustic emission (AE) monitoring of composite components offers a highly sensitive method for detecting matrix cracking and delamination damage mechanisms in composites. AE relies on the detection of stress waves that are released during damage propagation and using an array of sensors, damage location may be determined. A methodology for damage characterisation based on measuring the amplitude ratio (MAR) of the two primary lamb wave modes; symmetric (in-plane) and asymmetric (out-of-plane) that propagate in plate like structures has been developed. This paper presents the findings of a series of tensile tests in composite coupons with large central ply blocks. The specimens were monitored using AE sensors throughout loading and once significant AE signals were observed the loading process was stopped. The specimens were removed and subjected to x-ray inspection to assess for any damage. The onset of damage was successfully detected using AE and was identified as being matrix cracking using the MAR methodology. The results were validated with x-ray inspection and a strong correlation was observed between the number of significant AE signals recorded and the number of identified matrix cracks.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering Centre for Advanced Manufacturing Systems At Cardiff (CAMSAC)
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TL Motor vehicles. Aeronautics. Astronautics
Publisher:	IOP Publishing
ISSN:	1742-6596
Last Modified:	05 Jan 2024 06:08
URI:	https://orca.cardiff.ac.uk/id/eprint/14341

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