Understanding Fatigue Delamination Crack Growth in a Wind Turbine Rotor Blade Through an Element Testing

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Abstract

A novel element test specimen, considered to be representative of a thick composite laminate in a wind turbine rotor blade, is investigated in cyclic loading for fatigue delaminations. The element test specimen has an embedded artificial defect to mimic the delaminations in the spar cap of a 31 m wind turbine rotor blade. The aim was to measure the growth rate of delamination cracks and the temperature rise during the cracks propagation. It was noticed that four delamination cracks initiated and propagated, out of which two cracks were along the embedded defect interface planes and the other two originated from the crack-tips of a transvers tunneling crack in the resin pocket. The initial difference in the crack lengths of the four cracks translated throughout the cyclic loading. Initiation and propagation of multiple delamination cracks documented by the optical images were well correlated by the temperature distribution recorded from the thermal images.
Original languageEnglish
Title of host publicationProceedings of ECCM21 – 21st European Conference on Composite Materials : Material and Structural Behavior - Simulation & Testing
Volume3
Place of PublicationNantes, France
PublisherEuropean Society for Composite Materials
Publication date2024
Pages1132-1139
ISBN (Electronic)978-2-912985-01-9
Publication statusPublished - 2024
Event21st European Conference on Composite Materials - Nantes, France
Duration: 2 Jul 20245 Jul 2024

Conference

Conference21st European Conference on Composite Materials
Country/TerritoryFrance
CityNantes
Period02/07/202405/07/2024

Keywords

  • Delamination
  • Element test specimen
  • Cyclic loading
  • Fatigue crack growth
  • Wind turbine rotor blade

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