Details
| Original language | English |
|---|---|
| Number of pages | 20 |
| Publication status | E-pub ahead of print - 15 Jan 2024 |
Abstract
This paper investigates the degree of non-proportionality of three-dimensional stress histories in trailing edge adhesive joints of wind turbine rotor blades. For the quantification of non-proportionality, the concept of so-called non-proportionality factors is utilized. Existing approaches show weaknesses for the application to adhesives. Hence, a novel non-proportionality factor is introduced in this work that combines two formulations from literature. After a concise verification, it is applied to analyze the trailing edge adhesive joints of three different blade designs in the framework of a numerical comparative study.
The results do not reveal any correlation between the degree of non-proportionality and the blade size. General conclusions are hard to draw, as the blade response does not only depend on the turbine size, but also on the blade design philosophy. However, each blade shows significant degrees of non-proportionality that should not be neglected in fatigue damage analyses.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
Research Area (based on ÖFOS 2012)
- TECHNICAL SCIENCES
- Construction Engineering
- Civil Engineering
- Endurance strength
- TECHNICAL SCIENCES
- Construction Engineering
- Civil Engineering
- Lightweight design
- TECHNICAL SCIENCES
- Construction Engineering
- Civil Engineering
- Computational engineering
- TECHNICAL SCIENCES
- Environmental Engineering, Applied Geosciences
- Environmental Engineering
- Renewable energy
Sustainable Development Goals
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2024.
Research output: Working paper/Preprint › Preprint
}
TY - UNPB
T1 - Non-proportionality analysis of multiaxial fatigue stress histories in trailing edge adhesive joints of wind turbine rotor blades
AU - Balzani, Claudio
AU - Castelos, Pablo Noever
N1 - This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) as part of the Collaborative Research Center 1463 ‘Integrated Design and Operation Methodology for Offshore Megastructures’ (SFB1463 – Project ID 434502799) and by the German Federal Ministry for Economic Affairs and Climate Actions (BMWK) of Germany as part of the coordinated research projects ‘SmartBlades2’ (Project ID 0324032C) and ‘ReliaBlade’ (Project ID 0324335B). The authors acknowledge the financial support.
PY - 2024/1/15
Y1 - 2024/1/15
N2 - Wind turbine rotor blades are exposed to complex multiaxial stress states due to the aero-(hydro-)servo-elastic behaviour of the turbine. The dynamic response of rotor blades can result in non-proportional stress histories in the adhesive joints. These are not properly considered in current design guidelines and standards. However, knowledge about the degree of non-proportionality is crucial for choosing an appropriate fatigue analysis framework.This paper investigates the degree of non-proportionality of three-dimensional stress histories in trailing edge adhesive joints of wind turbine rotor blades. For the quantification of non-proportionality, the concept of so-called non-proportionality factors is utilized. Existing approaches show weaknesses for the application to adhesives. Hence, a novel non-proportionality factor is introduced in this work that combines two formulations from literature. After a concise verification, it is applied to analyze the trailing edge adhesive joints of three different blade designs in the framework of a numerical comparative study.The results do not reveal any correlation between the degree of non-proportionality and the blade size. General conclusions are hard to draw, as the blade response does not only depend on the turbine size, but also on the blade design philosophy. However, each blade shows significant degrees of non-proportionality that should not be neglected in fatigue damage analyses.
AB - Wind turbine rotor blades are exposed to complex multiaxial stress states due to the aero-(hydro-)servo-elastic behaviour of the turbine. The dynamic response of rotor blades can result in non-proportional stress histories in the adhesive joints. These are not properly considered in current design guidelines and standards. However, knowledge about the degree of non-proportionality is crucial for choosing an appropriate fatigue analysis framework.This paper investigates the degree of non-proportionality of three-dimensional stress histories in trailing edge adhesive joints of wind turbine rotor blades. For the quantification of non-proportionality, the concept of so-called non-proportionality factors is utilized. Existing approaches show weaknesses for the application to adhesives. Hence, a novel non-proportionality factor is introduced in this work that combines two formulations from literature. After a concise verification, it is applied to analyze the trailing edge adhesive joints of three different blade designs in the framework of a numerical comparative study.The results do not reveal any correlation between the degree of non-proportionality and the blade size. General conclusions are hard to draw, as the blade response does not only depend on the turbine size, but also on the blade design philosophy. However, each blade shows significant degrees of non-proportionality that should not be neglected in fatigue damage analyses.
UR - https://doi.org/10.5194/wes-2023-167
U2 - 10.5194/wes-2023-167
DO - 10.5194/wes-2023-167
M3 - Preprint
BT - Non-proportionality analysis of multiaxial fatigue stress histories in trailing edge adhesive joints of wind turbine rotor blades
ER -