Quantitative characterization of interface delamination in composite T-joint using couplant-free Lamb wave methods

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dc.contributor.authorPadiyar M, Janardhan
dc.contributor.authorBalasubramaniam, Krishnan
dc.date.accessioned2020-12-18T15:43:50Z
dc.date.available2020-12-18T15:43:50Z
dc.date.issued2015-11-24
dc.description.abstractResearch in quick Non-Destructive Evaluation methods for field maintenance of aircraft has become a focus of attention due to increase in the use of co-cured skin-stiffened composite structures. When Lamb wave propagates over skin-stiffened structure, the occurrence of multiple modes is unavoidable due to structural features such as stringers and stiffeners, which in turn makes the interpretation of the received wave difficult and limits the defect-detection ability of Lamb waves. Using Finite Element simulations, the propagation of incident S0 Lamb mode in a typical composite T-joint with delamination between the flange and skin (interface) is investigated. Arrival time delays of the out-of-plane mode-converted wave packets are found to be promising indicator for quantitative detection and sizing of the delamination. A novel experimental technique of combining a liquid couplant-free transduction scheme using dry-coupled roller transducer (contact probe) for generating S0 mode and an air-coupled transducer (non-contact probe) as a receiver is proposed. This transduction scheme helps in selectively separating mode-converted wave packets. This investigation also establishes quantitative B-scan imaging method for characterization of delamination in the T-joint. Experimental results show a good agreement with Finite Element predictions.en_UK
dc.identifier.citationPadiyar MJ, Balasubramaniam K. (2016) Quantitative characterization of interface delamination in composite T-joint using couplant-free Lamb wave methods. Journal of Reinforced Plastics and Composites, Volume 35, Issue 4, February 2016, pp.345-361en_UK
dc.identifier.issn0731-6844
dc.identifier.urihttps://doi.org/10.1177/0731684415617247
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16101
dc.language.isoenen_UK
dc.publisherSageen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectwave propagationen_UK
dc.subjectair-coupled ultrasonicsen_UK
dc.subjectS0 modeen_UK
dc.subjectdelaminationen_UK
dc.subjectComposite structureen_UK
dc.titleQuantitative characterization of interface delamination in composite T-joint using couplant-free Lamb wave methodsen_UK
dc.typeArticleen_UK

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