Fatigue and post-fatigue static crack characterisation of a wrinkled thick glass fibre laminate in a composite wind turbine blade

Xing-Yuan Miao, Chi-Jen Chen, Søren Fæster, Seyed Sina Samareh-Mousavi, Xiao Chen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

27 Downloads (Pure)

Abstract

In this study, we present the fatigue and post-fatigue static crack characterisation of a wrinkled thick glass fibre/polyester composite laminate, which is cut out from a spar cap of a wind turbine blade after full-scale fatigue loading. Fatigue cracks in the laminate were characterised with X-ray computed tomography. The fracture mode and fracture path under fatigue loading were identified. A subsequent static compression test was conducted on the laminate to induce a further propagation of the existing fatigue cracks. The laminate was scanned again with X-ray computed tomography after static compression to identify the crack growth path. The fracture features induced by the fatigue and static compression were examined using scanning electron microscope analysis. It is found that the fractures of the wrinkled thick laminate under fatigue loading is characterised by Mode-II dominated fracture. Prominent and frequent matrix rollers and striations were observed on the fatigue fracture surfaces. The fractures of the laminate under static compression show mixed mode. The effects of existing fatigue cracks on the post-fatigue static cracks were investigated. The fracture features characterised in this work provide a reference for the root cause analysis of blade failure in the field.
Original languageEnglish
Article number107855
JournalInternational Journal of Fatigue
Volume176
Number of pages13
ISSN0142-1123
DOIs
Publication statusPublished - 2023

Keywords

  • Wind turbine blades
  • Crack characterisation
  • Fatigue
  • Static compression
  • Post-fatigue damage

Fingerprint

Dive into the research topics of 'Fatigue and post-fatigue static crack characterisation of a wrinkled thick glass fibre laminate in a composite wind turbine blade'. Together they form a unique fingerprint.

Cite this