CT dataset for 3D visualisation of particle distributions in carbon fibre-reinforced polymer composites using Near-field ptychography

November 9th 2025 CT data files information CT datasets used for the paper: “3D strain mapping around fibre breaks using in situ synchrotron computed tomography and digital volume correlation” Authors: Yeajin Lee, Yentl Swolfs, Partha Paul, Marco Margini, Fernando AlvarezBorges, Pierre Thibault, Mark N. Mavrogordato, Ian Sinclair, S. Mark Spearing 1. Folder "NFP_CFRP_150nm" • The folder “NFP_CFRP_150nm” contains CT data files obtained via Near-Field Ptychography (NFP) at a voxel size of 150 nm at the ID16A beamline of the European Synchrotron Radiation Facility. • This folder contains CT data used for 3D visualisation of particle (i.e. volumetric speckle patterns) distributions within a DVC sub-volume of 21 µm (see Sections 2.4 and 4.1 of the manuscript). • This folder contains four sub-folders, each containing 10 analysed sample volumes: - “STEP1_NFP_CFRP_Original” - “STEP2_NFP_Fibre_Removed_Only_Particles” - “STEP3_NFP_Denoised_Particles_Non-local_Filter” - “STEP4_NFP_Segmented_Particles” 2. File naming strategy The file-naming strategy is explained with an example, and the same file-naming strategy is applied to all files in the other subfolders. Example) You can see a raw file named “S1_STEP1_140x140x140.8bit.raw” in the sub-folder “STEP1_NFP_CFRP_Original” November 9th 2025 • S1 indicates the CT volume corresponding to Sample 1 among the 10 analysed volumes. • STEP1 indicates that the volume was used/processed in Step 1. • 140x140x140.8bit.raw represents the CT volume size, bit type, and file format. First, the 140x140x140 correspond to number of pixels in the X, Y, and Z directions, respectively. A dimension of 140 pixels is equivalent to 21 µm (the DVC sub-volume size). Second, ‘8bit.raw’ indicates that the file is in 8-bit format and saved as a raw file. Note: You will need this information, along with the voxel size (150 nm), when importing the raw files into image processing software (e.g. ImageJ, Avizo, Dragonfly, etc). For example, if you open the S2 volume corresponding to steps 1, 2, 3, and 4, you will be able to track how the particles were segmented from the original CFRP volumes, as shown below. The Step 4 volume is the binarised file, meaning that the greyscale values are either 0 or 1. Therefore, when opening the raw files of the segmented particles (Step 4), you’ll need to adjust the histogram range appropriately (ideally 0 to 1) to visualise the pixels with a greyscale value of 1. S2_STEP1_140x140x140 S2_STEP2_140x140x140 S2_STEP3_140x140x140 S2_STEP4_140x140x140 Histogram range [0,1] November 9th 2025 Acknowledgements The authors acknowledge the European Synchrotron Radiation Facility (ESRF) for the provision of synchrotron radiation facilities at the ID19 beamline under proposal number MA5711 and ID16A beamline. We greatly appreciate the technical support provided by the beamline scientists at ID19 (Ludovic Broche) and ID16A (Dmitry Karpov and Peter Cloetens) throughout the preparation and execution of the experiments, as well as the reconstruction of the scans. We also extend our deepest gratitude to our colleagues in the MA5711 experiment (Orestis Katsamenis, Marco Endrizzi, Lorenzo Massimi, Fabio De Marco, Vittorio Di Trapani) for invaluable assistance in performing in situ SRCT experiments. The μ-VIS X-Ray Imaging Centre at the University of Southampton is acknowledged for providing access to image processing facilities. Citation and Contact Information The published CT datasets are those processed for the manuscript “3D strain mapping around fibre breaks using in situ synchrotron computed tomography and digital volume correlation”. The authors kindly request that this paper and datasets be cited when the datasets are used. If you encounter any issues using the files or require further information, please contact to [email protected]