Mixed-Mode Interlaminar Fracture Toughness of Glass and Carbon Fibre Powder Epoxy Composites – for Design of Wind and Tidal Turbine Blades

Christophe Floreani, Colin Robert, Parvez Alam, Peter Davies, Conchúr M. Ó Brádaigh

Research output: Contribution to journalArticlepeer-review

Abstract

Powder epoxy composites have several advantages for the processing of large composite structures, including low exotherm, viscosity and material cost, as well as the ability to carry out separate melting and curing operations. This work studies the mode I and mixed-mode toughness, as well as the in-plane mechanical properties of unidirectional stitched glass and carbon fibre reinforced powder epoxy composites. The interlaminar fracture toughness is studied in pure mode I by performing Double Cantilever Beam tests and at 25% mode II, 50% mode II and 75% mode II by performing Mixed Mode Bending testing according to the ASTM D5528-13 test standard. The tensile and compressive properties are comparable to that of standard epoxy composites but both the mode I and mixed-mode toughness are shown to be significantly higher than that of other epoxy composites, even when comparing to toughened epoxies. The mixed-mode critical strain energy release rate as a function of the delamination mode ratio is also provided. This paper highlights the potential for powder epoxy composites in the manufacturing of structures where there is a risk of delamination.
Original languageEnglish
Article number2103
JournalMaterials
Volume14
Issue number9
Early online date21 Apr 2021
DOIs
Publication statusE-pub ahead of print - 21 Apr 2021

Keywords

  • Toughened Composites
  • Fracture Toughness
  • Delamination

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