Accurate fibre orientation measurement for carbon fibre surfaces

Zambal, Sebastian; Palfinger, Werner; Stöger, Matthias; Eitzinger, Christian

doi:10.1016/j.patcog.2014.11.009

Cited by 43 publications

(20 citation statements)

References 17 publications

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“…This presents a problem for many traditionally effective NDT methods such as ultrasonic testing (UT) as they require contact with the test material through a coupling medium or for the sample to be submerged in water. Potential in-line non-destructive testing techniques include optical sensing with image processing methods to measure fibre alignment [6,7,8,9]. Such approaches are fast and low cost but cannot measure orientation in $ sub-surface plies.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of carbon fibre-reinforced polymer composites through radon-transform analysis of complex eddy-current data

Hughes

Drinkwater

Smith

2018

Composites Part B: Engineering

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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 eddycurrent 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.

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Section: Introductionmentioning

confidence: 99%

Characterisation of carbon fibre-reinforced polymer composites through radon-transform analysis of complex eddy-current data

Hughes

Drinkwater

Smith

2018

Composites Part B: Engineering

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“…Although the general concept of a digital twin covers the complete life-cycle of a part [5,7], this work focuses on the carbon fiber lay-up process. Approaches for monitoring of such processes have been proposed in the past [8], [9]. For the experiments similar sensor systems are used to acquire raw data.…”

Section: Related Workmentioning

confidence: 99%

A digital twin for composite parts manufacturing : Effects of defects analysis based on manufacturing data

Zambal

Eitzinger

Clarke

et al. 2018

2018 IEEE 16th International Conference on Industrial Informatics (INDIN)

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The manufacturing of structural parts made from carbon fiber composite materials is a complex process that requires extended quality control. To facilitate better decisions about the mechanical properties of the part and, consequently, the need for rework , a manufacturing database is proposed that creates a digital twin of the part as manufactured. The main contribution of the paper is to highlight how to merge incoming sensor data into the database and how to use these data to determine the margin of safety for the part. This is demonstrated on the example of an ADMP (automated dry material placement) process during the manufacturing of a section of an aircraft wing lower cover.

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“…The problem of estimating the orientation or the direction of the objects of an image has been previously addressed with different approaches: using the Hough transformation (Chaudhuri et al 1993), estimating the skew angle of an image with a calibration method (Bian et al 2013), analysing the two-dimensional (2D) FFT with Principal Component Analysis (Josso et al 2005), and employing the photometric stereo technique (Zambal et al 2015). Moreover, the 2D-FFT and the structure tensor of the image are also employed by OrientationJ and Directionality, which are two plugins of the ImageJ image processing software (ImageJ -National Institutes of Health -USA)analys.…”

Section: Introductionmentioning

confidence: 99%

Method to estimate the medullar rays angle in pieces of wood based on tree-ring structure: application to planks of Quercus petraea

et al. 2017

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Estimating wood parameters employing non-destructive methods has been widely studied in recent years. The choice of wood used to build wine ageing barrels (cooperage) is strongly influenced by wood anatomy and specifically by the orientation of medullar rays among other aspects. In this article, a method based on the regularities of the tree-ring structure to estimate the medullar ray angle of the cross-section of a piece of wood is proposed. This angle shows the direction of the best linear path to evaluate several tree-ring features and could be employed to automate tasks, such as introducing an analysis path or rotating the image before the analysis, which some dendro analysis methods require. A dataset of 26992 synthetic images and 110 real oak wood images was used to validate the approach. The medullar ray angle of each image considered was measured manually and estimated using the method proposed here, which employs the Fast Fourier Transform (FFT) to take advantage of the tree-ring structure regularities and find the direction angle of the best linear path to evaluate several tree-ring features. The results obtained demonstrate a mean squared error of 0.29º and 8.19º and a mean absolute error of 0.19º and a 5.91º for the synthetic and oak wood images, respectively. These data suggest the suitability of the proposed method as part of an automated system to inspect and analyse the growth rings in oak wood planks.

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Accurate fibre orientation measurement for carbon fibre surfaces

Cited by 43 publications

References 17 publications

Characterisation of carbon fibre-reinforced polymer composites through radon-transform analysis of complex eddy-current data

Characterisation of carbon fibre-reinforced polymer composites through radon-transform analysis of complex eddy-current data

A digital twin for composite parts manufacturing : Effects of defects analysis based on manufacturing data

Method to estimate the medullar rays angle in pieces of wood based on tree-ring structure: application to planks of Quercus petraea

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