An experimental and numerical study on fatigue damage development in laminates containing embedded wrinkle defects

Supratik Mukhopadhyay*, Oliver J. Nixon-Pearson, Stephen R. Hallett

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

12 Citations (Scopus)
313 Downloads (Pure)

Abstract

Out-of-plane fibre waviness or ‘wrinkle’ defects significantly reduce the strength of laminated composites under quasi-static tension loads. Under tension-tension cyclic loading, the peak load amplitude remains lower than the wrinkled laminate quasi-static strength. Small delaminations can however still initiate early during the load history and grow steadily with increasing numbers of cycles until becoming critical, leading to ultimate structural failure. This paper focusses on the application of a novel 3D finite element modelling framework to predict fatigue delamination initiation and growth from wrinkle defects. An experimental programme was conducted alongside the modelling, for validation purposes. Carbon fibre/epoxy laminates with a quasi-isotropic layup containing artificially induced wrinkles were tested at various load severities (percentage of quasi-static failure load), until failure (defined percentage loss of the initial undamaged stiffness). Failure progression was closely monitored throughout the test. A detailed comparison between the novel finite element analyses and experiments was undertaken, and it was shown that the delamination locations, extent and cycles to failure could be very accurately predicted.
Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalInternational Journal of Fatigue
Volume107
Early online date16 Oct 2017
DOIs
Publication statusPublished - 1 Feb 2018

Structured keywords

  • Composites UTC

Keywords

  • Composites
  • Defects
  • Fatigue crack growth
  • Finite elements

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