Propagation of Interacting Cracks in Offshore Wind Welded Structures through Numerical Analysis

Chakkalakkal Joseph, Jose Mishael; Morato, Pablo G; Rigo, Philippe

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Propagation of Interacting Cracks in Offshore Wind Welded Structures through Numerical Analysis

Chakkalakkal Joseph, Jose Mishael; Morato, Pablo G; Rigo, Philippe

2024 • In Proceedings of the Thirty-fourth (2024) International Ocean and Polar Engineering Conference

Peer reviewed

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https://hdl.handle.net/2268/331012

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Keywords :

Fatigue crack growth; stress intensity factor; crack interaction; crack coalescence; welded structures; offshore wind turbine foundations.

Abstract :

[en] This study investigates the behavior of interacting surface cracks at the circumferential weld toe of monopile-supported offshore wind turbines. Relying on a numerical model that explicitly considers weld profiles, we explore the impact of crack interaction and loading scenarios on crack propagation. Our findings reveal that, initially, surface cracks grow independently, resembling single crack behavior. However, a pronounced interaction effect accelerates their growth as cracks propagate further, potentially leading to crack coalescence, high stress intensity factors, and reduced fatigue life. Consequently, this work highlights the need for integrating specific weld geometry representation in numerical models, as neglecting this can lead to significantly inaccurate fatigue life estimates in typical practical applications. Moreover, this study points out the challenge in accessing representative crack growth material parameters, vital for accurately evaluating the fatigue life of structural connections in offshore wind turbines.

Disciplines :

Engineering, computing & technology: Multidisciplinary, general & others

Author, co-author :

Chakkalakkal Joseph, Jose Mishael ; Université de Liège - ULiège > Urban and Environmental Engineering

Morato, Pablo G; Delft University of Technology, Delft, Netherlands > Faculty of Architecture and the Built Environment

Rigo, Philippe ; Université de Liège - ULiège > Département ArGEnCo ; Université de Liège - ULiège > Département ArGEnCo > ANAST (Systèmes de transport et constructions navales)

Language :

English

Title :

Propagation of Interacting Cracks in Offshore Wind Welded Structures through Numerical Analysis

Publication date :

June 2024

Event name :

Thirty-fourth (2024) International Ocean and Polar Engineering Conference

Event place :

Rhodes, Greece

Event date :

June 16-21, 2024

By request :

Yes

Audience :

International

Main work title :

Proceedings of the Thirty-fourth (2024) International Ocean and Polar Engineering Conference

Publisher :

The International Society of Offshore and Polar Engineers (ISOPE), United States

Pages :

3116-3123

Peer review/Selection committee :

Peer reviewed

Name of the research project :

MAXWind project

Funding text :

Energy Transition Fund (ETF), Belgium

Available on ORBi :

since 22 April 2025

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