Near-surface defect detection in additively manufactured components using laser induced phased arrays with surface acoustic wave crosstalk suppression

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dc.contributor.authorDavis, Geo
dc.contributor.authorStratoudaki, Theodosia
dc.contributor.authorLukacs, Peter
dc.contributor.authorRiding, Matthew W.
dc.contributor.authorAl Fuwaires, Ahmed
dc.contributor.authorKamintzis, Panagiotis
dc.contributor.authorPieris, Don
dc.contributor.authorKeenan, Alan
dc.contributor.authorWilcox, Paul
dc.contributor.authorPierce, Gareth
dc.contributor.authorMacLeod, Charles
dc.contributor.authorWilliams, Stewart
dc.date.accessioned2024-01-11T14:35:40Z
dc.date.available2024-01-11T14:35:40Z
dc.date.issued2023-11-24
dc.description.abstractIn-process inspection of the additive manufacturing process requires a technique that can provide reliable measurements given the extreme operating environments, the small size of the defects and the cyclic melting and heating of the material, caused by subsequently deposited layers. A remote and couplant-free ultrasonic inspection technique using bulk waves that can image near-surface defects could address these in-process inspection requirements. Laser induced phased arrays (LIPA) generate and detect ultrasound based on laser ultrasonics principles, while the array is synthesised in post-processing. However, when using LIPAs for inspection, the surface acoustic waves (SAWs) interfere with the bulk wave modes giving rise to crosstalk and artefacts, which makes near-surface defect imaging difficult. This work experimentally validates and compares five techniques for SAW suppression: amplitude thresholding, mean waveform subtraction, principal component subtraction, frequency-wavenumber filtering, and phase coherence imaging. SAW suppression is demonstrated in ultrasonic images of transverse waves based on 71-element LIPA data synthesised on a Ti-6Al-4V directed energy deposition-arc (DED-Arc/Ti6Al4V) sample with a ∼1 mm diameter side drilled hole, located at ∼4 mm below the inspected surface. The reported results show that the principal component subtraction approach achieved the highest ‘signal-to-crosstalk ratio’ improvement of 16 dB, while successfully suppressing the SAW.en_UK
dc.description.sponsorshipThis work was supported by the UK Engineering and Physical Sciences Research Council [EP/T012862/1, EP/R513349/1, EP/V051814/1, EP/S023275/1, EP/S023879/1, EP/R027218/1].en_UK
dc.identifier.citationDavis G, Stratoudaki T, Lukacs P, et al., (2023) Near-surface defect detection in additively manufactured components using laser induced phased arrays with surface acoustic wave crosstalk suppression. Materials & Design, Volume 236, December 2023, Article Number 112453en_UK
dc.identifier.eissn1873-4197
dc.identifier.issn0264-1275
dc.identifier.urihttps://doi.org/10.1016/j.matdes.2023.112453
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20642
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectAdditive manufacturingen_UK
dc.subjectLaser induced phased arraysen_UK
dc.subjectWave suppressionen_UK
dc.subjectTotal focusing methoden_UK
dc.subjectUltrasonic near-surface defect imagingen_UK
dc.titleNear-surface defect detection in additively manufactured components using laser induced phased arrays with surface acoustic wave crosstalk suppressionen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2023-11-05

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