Individual Fibre Inclination Segmentation from X-ray Computed Tomography using Principal Component Analysis

Filip Bo Salling*, Niels Jeppesen, Mads Rostgaard Sonne, Jesper H. Hattel, Lars Pilgaard Mikkelsen*

*Corresponding author for this work

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This study presents a holistic segmentation procedure, which can be used to obtain individual fibre inclination angles from X-ray computed tomography. The segmentation approach is based on principal component analysis and was successfully applied for a unidirectional and an air textured glass fibre reinforced composite profile. The inclination results show a weighted mean fibre inclination of 2.1° and 8.0° for the unidirectional and air textured profile, respectively. For the air textured composite, fibre inclinations of up to 55° were successfully segmented. The results were verified by comparative analysis with equivalent results obtained from structure tensor analysis – showing no notable deviation. The comparable characteristics in combination with the distinct differences of the two material systems make this case study ideal for verification and validation of idealized models. It is shown how this approach can provide fast, accurate and repeatable inclination estimates with a high degree of automation.
Original languageEnglish
JournalJournal of Composite Materials
Issue number1
Pages (from-to)83-98
Number of pages16
Publication statusPublished - 2022


  • Glass fibre composites
  • Fibre undulation
  • Segmentation verification
  • Singular value decomposition
  • Structure tensor


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