Preprints
https://doi.org/10.5194/wes-2023-167
https://doi.org/10.5194/wes-2023-167
15 Jan 2024
 | 15 Jan 2024
Status: a revised version of this preprint is currently under review for the journal WES.

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

Claudio Balzani and Pablo Noever Castelos

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.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Claudio Balzani and Pablo Noever Castelos

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2023-167', Alexander Krimmer, 31 Jan 2024
    • AC2: 'Reply on RC1', Claudio Balzani, 07 May 2024
  • RC2: 'Comment on wes-2023-167', Anonymous Referee #2, 18 Feb 2024
    • AC3: 'Reply on RC2', Claudio Balzani, 07 May 2024
  • AC1: 'Comment on wes-2023-167', Claudio Balzani, 15 Apr 2024
Claudio Balzani and Pablo Noever Castelos
Claudio Balzani and Pablo Noever Castelos

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Short summary
Wind turbine rotor blades consist of several subcomponents that are glued together. Such connections are subjected to fatigue loads. This paper analyzes the characteristics of those fatigue loads in trailing edge adhesive joints of three different wind turbine rotor blades. It is shown that the fatigue loads have significant degrees of non-proportionality, which helps engineers to choose a valid fatigue analysis framework and to design more reliable and cost-efficient rotor blades in the future.
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