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

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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 (https://doi.org/10.1016/j.compositesb.2023.111038)

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Abstract

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.

ORCID iDs

Srisuriyachot, Jiraphant, Bénézech, Jean, Couégnat, Guillaume, McNair, Sophie A.M. ORCID logoORCID: https://orcid.org/0000-0002-6793-2481, Maierhofer, Thomas, Butler, Richard and Lunt, Alexander J.G.;
CORE (COnnecting REpositories)