Resources | PAAM Lab

Method for the microstructural characterisation of unidirectional composite tapes

Mon, 12 Oct 2026 00:00:00 +0000

Method for the microstructural characterisation of unidirectional composite tapes (Katuin et al.) This code by Nico Katuin presents a novel approach to identify microstructural features both along the tape thickness and through the thickness. Voronoi tesselation based evaluation of the fibre volume content on cross sectional micrographs, with consideration of the matrix boundary, is performed. The method is shown to be robust and is suitable to be automated. It has the potential to discriminate specific microstructural features and to relate them to processing behaviour removing the need for manufacturing trials. The original code is based on the master thesis of Nico Katuin at Delft University of Technology (https://repository.tudelft.nl/islandora/object/uuid%3A071a2a22-fa4d-423b-b049-6f2e70dbfc19) and has been further developed for this publication.

The MicrostructuralCharaterisation_v5.py code was originally written to compare micrographs from three UD tapes from different suppliers. The fileloc variable can be used to specify which UD tape is analysed. In the original work of Katuin a powerful stitching functionality of a high resolution optical/confocal microscope was used. The obtained wide micrograph of a UD tape section was split into several width segments. This to increase the ease of manually defining the tape boundary. The amount of micrograph segments is not limited for the algorithm. Although, the width of the segments should be equal.

The function blocks and function code are provided with comments in the .py file and should be self explanatory.

GitHub: tud-amt/ud-micro

X-ray computed tomography of a unidirectional composite tape with microporosity features

Mon, 12 Oct 2026 00:00:00 +0000

The collection includes X-ray computed tomography measurements in 8-bit .tif format of a development-grade version of the unidirectional carbon fibre tape Toray Cetex® TC1225, manufactured by Toray Advanced Composites.

The data was acquired using a Zeiss Xradia 520 Versa at a voxel size of 0.7788 µm, with a voltage-to-power ratio of 70/5 kV/W, an exposure time of 7 s, and a 2000x2000 pixel detector operating with no binning and 4x magnification. Three scan volumes were stitched together along the tape’s longitudinal direction with a 20% overlap. The measurements were conducted at the Naturalis Biodiversity Center, Leiden (NL). A .txt file summarizing the dataset description is also included.

Since multiple materials were present in the field of view of the original scan, only the region corresponding to the tape of interest has been cropped and reported here.

DOI: 10.4121/B877FE30-D07F-4936-AF8D-06FB78C54566

X-ray computed tomography of unidirectional carbon fiber composites

Mon, 12 Oct 2026 00:00:00 +0000

The collection includes two .tif files, corresponding to two different X-ray computed tomography measurements of unidirectional carbon fibre and poly(ether-ether-ketone) tapes for automated fiber placement.

The data reported was acquired with a Zeiss Xradia 520 Versa, at a resolution of 0.7232 um, voltage-to-power ratio of 100/9 kV/W, exposure time of 6 s with a 2000x2000 pixel detector in binning mode 2 and 4x objective. Three scan volumes were stitched together in the tape longitudinal direction. The measurements were conducted at Naturalis Biodiversity Center, Leiden (NL). A .txt file with a summary of the datasets description is also included.

DOI: 10.4121/16437297

Gas Permeation Tool

Tue, 01 Oct 2024 00:00:00 +0000

This tool has been developed by Joffrey Feltin and Ran Tao, supervised by Bilim Atli-Veltin to clarify and explain the physical phenomena of gas permeation in materials.

On this web page, you’ll find :

Explanations, definitions and animations of this phenomena,
A tool to determine the permeation coefficient (permeability) from experimental data,
A unit converter to convert all the differents units you can find in paper about permeability,
A tool to see the evolution of the permeate flow in cases of cracks, or not.
A glossary and some useful resources and references.

Open the Gas Permeation Tool