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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wilcox, Pd
University of Bristol
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2023Modelling and evaluation of carbon fibre composite structures using high-frequency eddy current imagingcitations
- 2020Data fusion of multi-view ultrasonic imaging for characterisation of large defectscitations
- 2018Ultrasonic Analytic-Signal Responses from Polymer-Matrix Composite Laminatescitations
- 2016Ultrasonic tracking of ply drops in composite laminatescitations
- 2015Progress in non-destructive 3D characterization and modelling of aerospace composites
- 2013Imaging composite material using ultrasonic arrayscitations
- 2013Effective dynamic moduli and density of fiber-reinforced composites
- 2012Monte Carlo inversion of ultrasonic array data to map anisotropic weld propertiescitations
- 2012Autofocus imaging
- 2012Imaging composite material using ultrasonic arrayscitations
- 2012Effective dynamic constitutive parameters of acoustic metamaterials with random microstructurecitations
- 2010Inspection of single crystal aerospace components with ultrasonic arrayscitations
- 2009Post-processing of guided wave array data for high resolution pipe inspectioncitations
- 2008Acoustic emission from pitting corrosion in stressed stainless steel platecitations
- 2008Lamb wave propagation in negative Poisson's ratio composites
- 2006Guided Wave Acoustic Emission from Fatigue Crack Growth in Aluminium Plate
- 2006On the development and testing of a guided ultrasonic wave array for structural integrity monitoringcitations
- 2006Acoustic emission in wide composite specimens
- 2006Global crack detection for aircraft monitoring using bispectral analysis
- 2005Omnidirectional guided wave inspection of large metallic plate structures using an EMAT arraycitations
Places of action
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article
Imaging composite material using ultrasonic arrays
Abstract
<p>As carbon fibre composite becomes more widely used for primary structural components in aerospace and other applications, the reliable detection of small defects in thick-sections is increasingly important. This article describes an experimental procedure for improving the detectability of such defects based on modifications to the Total Focusing Method (TFM) of processing ultrasonic array data to form an image. First the TFM is modified to include the directional dependence of ultrasonic velocity in an anisotropic composite laminate, and practical procedures for measuring the direction-dependent velocity profile are described. The performance of the TFM is then optimised in terms of the signal to noise ratio for Side-Drilled Holes (SDHs) by tuning both the frequency-domain filtering of data and the maximum aperture angle used in processing. Finally an attenuation correction is applied to the image so that the background structural noise level is uniform at all depths. The result is an image where the sensitivity (i.e. the signal to noise ratio) to a particular feature is independent of depth. Signals from 1.5 mm diameter SDHs in the final image at depths of 4, 10 and 16 mm are around 15 dB above the root-mean-square level of the surrounding structural noise. In a standard TFM image, the signals from the same SDHs are not visible above the structural noise. (C) 2012 Elsevier Ltd. All rights reserved.</p>