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Abstract
Maintaining the correct fibre orientations and stacking sequence in carbon-fibre reinforced polymers (CFRP) during manufacture is essential for achieving the required mechanical properties of a component. This paper presents and evaluates a method for the rapid characterisation of the fibre orientations present in CFRP structures, and the differentiation of different stacking sequences, through the Radon-transform analysis of complex-valued eddy-current testing (ECT) inspection data. A high-frequency (20 MHz) eddy-current inspection system was used to obtain 2D scans of a range of CFRP samples of differing ply stacking sequences. The complex electrical impedance scan data was analysed using Radon-transform techniques to quickly and simply determine the dominant fibre orientations present in the structure. This method is compared to 2D-fast Fourier transform (2D-FFT) analysis of the same data and shown to give superior quantitative results with comparatively fewer computational steps and corrections. Further analysis is presented demonstrating and examining a method for preserving the complex information inherent within the eddy-current scan data during Radon-transform analysis. This investigation shows that the real and imaginary components of the ECT data encode information about the sacking sequence allowing the distinction between composites with different stacking structures. This new analysis technique could be used for in-process analysis of CFRP structures as a more accurate characterisation method, reducing the chance of costly manufacturing errors.
Original language | English |
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Pages (from-to) | 252-259 |
Number of pages | 8 |
Journal | Composites Part B: Engineering |
Volume | 148 |
Early online date | 8 May 2018 |
DOIs | |
Publication status | Published - 1 Sept 2018 |
Keywords
- Carbon fibre
- In-line monitoring
- Non-destructive testing
- Quality control
- Data analysis
- Radon transform
- CFRP
- Stacking sequence
- Lay-up
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Dive into the research topics of 'Characterisation of carbon fibre-reinforced polymer composites through radon-transform analysis of complex eddy-current data'. Together they form a unique fingerprint.Projects
- 1 Finished
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Rework of NDT for high-value manufacturing of composites EoI
Smith, R. A. (Principal Investigator)
24/04/13 → 23/07/18
Project: Research
Datasets
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Composites Part B - ECT of CFRP paper 2018
Smith, R. (Creator), Hughes, R. (Creator) & Drinkwater, B. (Creator), University of Bristol, 6 Mar 2018
DOI: 10.5523/bris.1fzdkcshuyrxs2mledzihlne6q, http://data.bris.ac.uk/data/dataset/1fzdkcshuyrxs2mledzihlne6q
Dataset
Profiles
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Dr Robert R Hughes
- School of Electrical, Electronic and Mechanical Engineering - Senior Lecturer
- Ultrasonics and Non-destructive Testing (UNDT)
Person: Academic , Member