Synchrotron micro-CT in kink-band formation of UD-CFRP laminates with microdefects

Srisuriyachot, Jiraphant and Bénézech, Jean and Couégnat, Guillaume and McNair, Sophie A.M. and Maierhofer, Thomas and Butler, Richard and Lunt, Alexander J.G. (2023) Synchrotron micro-CT in kink-band formation of UD-CFRP laminates with microdefects. Composites Part B: Engineering, 266. 111038. ISSN 1359-8368 (

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This paper presents the first synchrotron micro-Computed Tomography (micro-CT) study on in-situ pure compressive kink-band failure in Uni-Directional Carbon Fibre-Reinforced Polymer composites (UD-CFRPs) with a notch. The study compares the failure behaviour of baseline samples under standard conditions with defect-rich samples containing micro-defects such as voids and fibre misalignment. Quantitative image-based analysis using the structure tensor technique and Digital Volume Correlation (DVC) reveals changes in fibre orientation and localised strain, respectively, at each increment load. A large 400 μm kink-band inclined at 30° with a half-cosine wave fibre orientation is observed in the baseline samples, while the defect-rich samples form narrower conjugate kink bands (ranging from 77 μm 25 μm) inclined at 45°. Development of kink-band formations/failure of both samples is discussed and compared with literature, providing key implications for the design and safe use of this type of composite layup.