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Multiaxial Fatigue Analysis of Jacket-Type Offshore Wind Turbine Based on Multi-Scale Finite Element Model.
Mengyao Peng1, Min Liu1,2, Shuitao Gu1
1School of Civil Engineering, Chongqing University, Chongqing 400044, China.
Materials (Basel, Switzerland)
|June 28, 2023
Summary
A new multi-scale modeling method enhances fatigue analysis for offshore wind turbines. This approach improves accuracy in predicting structural failure under complex wind and wave loading.
Area of Science:
- Mechanical Engineering
- Structural Engineering
- Materials Science
Background:
- Offshore wind turbine structural failure is often caused by fatigue damage in local joints.
- These structures endure complex multiaxial stress states due to wind and wave loading.
Purpose of the Study:
- To develop a multi-scale finite element modeling method for jacket-type offshore wind turbines.
- To analyze multiaxial fatigue damage in local joints under random loading.
Main Methods:
- A multi-scale finite element model was developed, using solid elements for local joints and beam elements for other components.
- Multiaxial fatigue damage analysis was performed using equivalent Mises and Lemaitre methods with multiaxial S-N curves.
Main Results:
- The multi-scale method accurately models tubular joints, showing up to a 15% difference in uniaxial fatigue damage compared to conventional beam models.
- Multiaxial fatigue analysis using the multi-scale model revealed approximately a 15% larger difference compared to uniaxial analysis.
Conclusions:
- The multi-scale finite element model is recommended for accurate multiaxial fatigue analysis of jacket-type offshore wind turbines.
- This method is crucial for predicting structural integrity under combined wind and wave random loading.
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