Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 81, Issue -, Pages 111-120Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2015.11.010
Keywords
Carbon fibre; Thermosetting resin; Fracture toughness; Environmental degradation
Funding
- Irish Research Council for Science, Engineering and Technology (IRCSET)
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Carbon fibre/Benzoxazine laminates with and without non-woven polyamide (PA) fibre veils at the interlaminar regions were manufactured using vacuum assisted resin transfer moulding (VARTM). The effect of the interlaminar thermoplastic veils on the Mode-II critical strain energy release rate (Glic), under both wet and dry conditions, was determined using two commercially available Benzoxazine resins: a toughened system and an untoughened system. In all samples the toughened system outperformed the untoughened system. The overall resistance to Mode-II crack growth was significantly improved by the inclusion of the interlaminar veils due to an increase in the thickness of the matrix-rich interlaminar region, plastic deformation of the PA fibres and a crack-pinning mechanism. Moisture caused an increase in matrix ductility, which improved the resistance to crack initiation; however, this was counteracted by a reduction in fibre/matrix interfacial strength causing a reduction in resistance to crack growth. (C) 2015 Elsevier Ltd. All rights reserved.
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