Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 73, Issue -, Pages 132-142Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2015.03.012
Keywords
Carbon fibre; Defects; Fracture; Finite element analysis (FEA)
Funding
- Rolls-Royce plc through the Composites University Technology Centre (UTC) at the University of Bristol, UK
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An experimental and numerical study has been carried out to understand and predict the compressive failure performance of quasi-isotropic carbon-epoxy laminates with out-of-plane wrinkle defects. Test coupons with artificially induced fibre-wrinlding of varied severity were manufactured and tested. The wrinkles were seen to significantly reduce the pristine compressive strength of the laminates. High-speed video of the gauge section was taken during the test, which showed extensive damage localisation in the wrinkle region. 3D finite element (FE) simulations were carried out in Abaqus/Explicit with continuum damage and cohesive zone models incorporated to predict failure. The FE analyses captured the locations of damage and failure stress levels very well for a range of different wrinkle configurations. At lower wrinkle severities, the analyses predicted a failure mode of compressive fibre-failure, which changed to delamination at higher wrinkle angles. This was confirmed by the tests. (C) 2015 Elsevier Ltd. All rights reserved.
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