A new model for fatigue load sequence effects in offshore wind turbine substructures and its implications for design life

R. C. Dragt, S. T. Hengeveld, J. Maljaars

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Measurements at Offshore Wind Turbine (OWT) substructures show that typical loading patterns include overloads, underloads, and shifts in mean stress cycles, due to the everchanging wind direction. These events follow each other in time and are further expressed as load sequences. Load sequences may affect the fatigue life. A novel model consisting of a set of explicit equations is developed to estimate the fatigue crack growth including effects of load sequences. The model is based on both experiments and finite element simulations. The model allows for (combinations of) over- and underloads and mean changes. With this model, an extrapolation is made towards realistic loading on OWT substructures to gain insight into the expected effect of load sequences on the fatigue life.

Original languageEnglish
Title of host publicationProceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018
PublisherInternational Society of Offshore and Polar Engineers
Pages265-272
Number of pages8
ISBN (Print)978-188-065-387-6
Publication statusPublished - 1 Jan 2018
Event28th International Ocean and Polar Engineering Conference, ISOPE 2018 - Sapporo, Japan
Duration: 10 Jun 201815 Jun 2018

Conference

Conference28th International Ocean and Polar Engineering Conference, ISOPE 2018
CountryJapan
CitySapporo
Period10/06/1815/06/18

Keywords

  • Crack growth
  • Fatigue
  • Load sequence effects
  • Offshore Wind Turbines
  • Overloads
  • Underloads

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