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An approach for the layer-by-layer analysis of fiber orientation of continuously fiber-reinforced polymers based on orientation analyses of computer-tomographic (CT) scans

Thursday (27.09.2018)
17:30 - 17:45 S1/01 - A2
Part of:

Dear reviewers,

unfortunately the system does not offer the possibility to change the first authors deviating from the logged in person. Please note that the first author and speaker of this submission will be Ludwig Schöttl. Please find our abstract below.


Dominik Dörr


Continuously fiber-reinforced polymers (CoFRP) are of great interest for designing lightweight structural components. The fiber orientation within CoFRP components has a distinct influence on the mechanical properties and is in turn significantly influenced by the manufacturing process. By means of computer-tomographic (CT) scans, the resulting fiber orientation can be measured. Fiber orientation analyses of CT scans, however, result in a tremendous amount of data and in a result for fiber orientation distribution for the entire laminate. For the efficient analysis of fiber orientation and validation of process simulation, however, a layer-by-layer result and a representative amount of data is desirable.

In this study, an approach for the determination of fiber orientation for each ply of CoFRP by means of CT scans is presented. This approach is based on fiber orientation analyses of CT scans by means of the grey-value gradient and the structure tensor for the determination of the local fiber orientation. For the separation of the single plies of the stacked laminate, two different methods are presented. The first approach uses the fiber orientation gradient in thickness direction of the laminate, whereas the second approach is based on the fiber orientation tensor coherence signal in thickness direction. The resulting fiber orientation for each ply is mapped onto a triangular surface mesh, resulting in a significant reduction of data and a ply-by-ply result for the fiber orientation. Based on this, a quantitative validation of process simulation, which predicts fiber orientation in forming simulation of CoFRP, is enabled.

The presented approaches are successfully applied to continuously fiber-reinforced thermoplastic tape-laminates (PA6-CF). The results reveal that especially the approach based on the fiber orientation gradient is suitable for the separation of the single plies.


Ludwig Schöttl
Karlsruhe Institute of Technology (KIT)
Additional Authors:
  • Dominik Dörr
    Karlsruhe Institute of Technology (KIT)
  • Pascal Pinter
    Karlsruhe Institute of Technology (KIT)
  • Tobias Joppich
    Fraunhofer Institute for Chemical Technology ICT
  • Frank Henning
    Karlsruhe Institute of Technology (KIT)
  • Luise Kärger
    Karlsruhe Institute of Technology (KIT)