Non-proportionality analysis of multiaxial fatigue stress histories in trailing edge adhesive joints of wind turbine rotor blades

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OriginalspracheEnglisch
Seitenumfang20
PublikationsstatusElektronisch veröffentlicht (E-Pub) - 15 Jan. 2024

Abstract

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.

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title = "Non-proportionality analysis of multiaxial fatigue stress histories in trailing edge adhesive joints of wind turbine rotor blades",
abstract = "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.",
author = "Claudio Balzani and Castelos, {Pablo Noever}",
note = "This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) as part of the Collaborative Research Center 1463 {\textquoteleft}Integrated Design and Operation Methodology for Offshore Megastructures{\textquoteright} (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 {\textquoteleft}SmartBlades2{\textquoteright} (Project ID 0324032C) and {\textquoteleft}ReliaBlade{\textquoteright} (Project ID 0324335B). The authors acknowledge the financial support.",
year = "2024",
month = jan,
day = "15",
doi = "10.5194/wes-2023-167",
language = "English",
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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.

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