### 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 language | English |
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Title of host publication | Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018 |

Publisher | International Society of Offshore and Polar Engineers |

Pages | 265-272 |

Number of pages | 8 |

ISBN (Print) | 978-188-065-387-6 |

Publication status | Published - 1 Jan 2018 |

Event | 28th International Ocean and Polar Engineering Conference, ISOPE 2018 - Sapporo, Japan Duration: 10 Jun 2018 → 15 Jun 2018 |

### Conference

Conference | 28th International Ocean and Polar Engineering Conference, ISOPE 2018 |
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Country | Japan |

City | Sapporo |

Period | 10/06/18 → 15/06/18 |

### Fingerprint

### Keywords

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

### Cite this

*Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018*(pp. 265-272). International Society of Offshore and Polar Engineers.

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*Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018.*International Society of Offshore and Polar Engineers, pp. 265-272, 28th International Ocean and Polar Engineering Conference, ISOPE 2018, Sapporo, Japan, 10/06/18.

**A new model for fatigue load sequence effects in offshore wind turbine substructures and its implications for design life.** / Dragt, R. C.; Hengeveld, S. T.; Maljaars, J.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

TY - GEN

T1 - A new model for fatigue load sequence effects in offshore wind turbine substructures and its implications for design life

AU - Dragt, R. C.

AU - Hengeveld, S. T.

AU - Maljaars, J.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - 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.

AB - 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.

KW - Crack growth

KW - Fatigue

KW - Load sequence effects

KW - Offshore Wind Turbines

KW - Overloads

KW - Underloads

UR - http://www.scopus.com/inward/record.url?scp=85053455801&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85053455801

SN - 978-188-065-387-6

SP - 265

EP - 272

BT - Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018

PB - International Society of Offshore and Polar Engineers

ER -