The reversibility of Mode-I and -II interlaminar fracture toughness after hydrothermal aging of Carbon/Benzoxazine composites with a thermoplastic toughening interlayer
作者： N.H. Nash , T.M. Young , W.F. Stanley
DOI: 10.1016/J.COMPSTRUCT.2016.05.086
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摘要: Abstract In order to determine the ability reverse changes in Mode-I and -II critical strain energy release rate (G IC G IIC ) or interlaminar fracture toughness (ILFT) brought about by water ingress, baseline (B) toughened (T) carbon laminates with two different Benzoxazine resin systems (BZ9120, BZ9130) manufactured using Vacuum Assisted Resin Transfer Moulding (VARTM) were tested under dry, wet dried environmental conditions. This study represents a “worst-case scenario” approach, that samples are soaked hot until maximum moisture content is achieved. It was found neither Mode-II ILFT of BZ9120B can be restored fully once saturation point has been reached. Microscopic images cross-sections showed causes irreversible damage form intralaminar matrix cracks. Dried exhibited brittle behaviour low fibre/matrix interfacial strength. Toughened outperformed as they partial recovery ILFT.
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