Hygrothermal ageing behaviour of a glass/epoxy composite used in wind turbine blades

I. Barcelos Carneiro M Rocha*, S Raijmaekers, R. P.L. Nijssen, F. P. van der Meer, L. J. Sluys

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

36 Citations (Scopus)
59 Downloads (Pure)

Abstract

In this work, a glass/epoxy material system applied in wind turbine blades was used to evaluate degradation processes induced by water ingression. Composite and neat epoxy specimens were conditioned in demineralised water at 50 °C for 4800 h and tested quasi-statically and in fatigue. Comparing results from mechanical tests in composite specimens, significant degradation was found, with up to 36% lower static shear strength and three orders of magnitude shorter fatigue life. For neat epoxy specimens, a lower degree of degradation was observed, with up to 17% lower tensile and bending moduli and strength. Specimens dried after having been immersed were also tested. For composite samples, recovery of shear stiffness and strength was incomplete. For neat resin, stiffness and bending strength were completely recovered but a decrease in the strain at failure was observed. It is hypothesised from differences in magnitude and reversibility of degradation between composite and neat resin that matrix degradation is accompanied by high differential swelling stresses and damage to the fibre/matrix interface in composites. The damage due to moisture ingression and the subsequent changes in failure behaviour are further investigated through thermal analysis (DSC, DMA) and optical microscopy.

Original languageEnglish
Pages (from-to)110-122
Number of pages13
JournalComposite Structures
Volume174
DOIs
Publication statusPublished - 15 Aug 2017

Keywords

  • Environmental degradation
  • Interface/Interphase
  • Mechanical testing
  • Polymer-matrix composites (PMCs)

Fingerprint

Dive into the research topics of 'Hygrothermal ageing behaviour of a glass/epoxy composite used in wind turbine blades'. Together they form a unique fingerprint.

Cite this