Fatigue properties of a structural rotor blade adhesive under axial and torsional loading

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  • Fraunhofer-Institut für Windenergiesysteme (IWES)
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OriginalspracheEnglisch
Seiten (von - bis)1121-1139
Seitenumfang19
FachzeitschriftFatigue and Fracture of Engineering Materials and Structures
Jahrgang46
Ausgabenummer3
PublikationsstatusVeröffentlicht - 8 Feb. 2023

Abstract

Axial and torsional fatigue tests at different stress ratios were performed on a structural adhesive designed for wind turbine rotor blades. By employing previously optimized specimens, fatigue properties were recorded without influences of manufacturing-induced defects such as pores. The Stüssi S–N model was an excellent fit to the data and was combined with a Haibach extension line to account for uncertainties in the gigacycle fatigue regime. A comparison of the results with hand-mixed specimens revealed significant and load level-dependent differences, indicating that manufacturing safety factors should be applied to the slope of the S–N curve. The experiments were accompanied by stiffness degradation measurements, which enabled an analysis of Young's and shear modulus degradation interactions. The degradation was modeled using power law fits, which incorporated load level-dependent fitting parameters to allow for a full description of the stiffness reduction and a prediction of the residual fatigue life of run-out specimens.

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Fatigue properties of a structural rotor blade adhesive under axial and torsional loading. / Kuhn, Michael; Manousides, Nikolas; Antoniou, Alexandros et al.
in: Fatigue and Fracture of Engineering Materials and Structures, Jahrgang 46, Nr. 3, 08.02.2023, S. 1121-1139.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Kuhn, Michael ; Manousides, Nikolas ; Antoniou, Alexandros et al. / Fatigue properties of a structural rotor blade adhesive under axial and torsional loading. in: Fatigue and Fracture of Engineering Materials and Structures. 2023 ; Jahrgang 46, Nr. 3. S. 1121-1139.
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abstract = "Axial and torsional fatigue tests at different stress ratios were performed on a structural adhesive designed for wind turbine rotor blades. By employing previously optimized specimens, fatigue properties were recorded without influences of manufacturing-induced defects such as pores. The St{\"u}ssi S–N model was an excellent fit to the data and was combined with a Haibach extension line to account for uncertainties in the gigacycle fatigue regime. A comparison of the results with hand-mixed specimens revealed significant and load level-dependent differences, indicating that manufacturing safety factors should be applied to the slope of the S–N curve. The experiments were accompanied by stiffness degradation measurements, which enabled an analysis of Young's and shear modulus degradation interactions. The degradation was modeled using power law fits, which incorporated load level-dependent fitting parameters to allow for a full description of the stiffness reduction and a prediction of the residual fatigue life of run-out specimens.",
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N1 - Funding Information: This work was supported by the German Federal Ministry for Economic Affairs and Climate Action (BMWK) in the ReliaBlade project (grant numbers 0324335A, 0324335B). The authors would like to acknowledge the work of Martina Karalus and Henning Schnellen, who accompanied the fatigue experiments as technicians and implemented the machine code. Open Access funding enabled and organized by Projekt DEAL.

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