Fatigue as a design driver for composite wind turbine blades

Nijssen, R.P.L.; Brøndsted, Povl

doi:10.1533/9780857097286.2.175

Cited by 28 publications

(23 citation statements)

References 5 publications

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“…Regarding common literature characterisations [45,46] for the fatigue life behaviour of typical unidirectional composites, for example, those used in rotor blade applications, the results obtained with the new test specimens are well comparable. In particular, the slopes of the best-fit SN-curves, as well as the composites strength, stiffness, and ply structure, are of the same magnitude.…”

Section: Details Of Fatigue Testing After Hygrothermal Wet Ageingsupporting

confidence: 53%

Effects of Hygrothermal Ageing on the Interphase, Fatigue, and Mechanical Properties of Glass Fibre Reinforced Epoxy

Gibhardt

Doblies

Meyer³

et al. 2019

Fibers

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Reliability and cost-effectiveness represent major challenges for the ongoing success of composites used in maritime applications. The development of large, load-bearing, and cyclically loaded structures, like rotor blades for wind or tidal energy turbines, requires consideration of environmental conditions in operation. In fact, the impact of moisture on composites cannot be neglected. As a result of difficult testing conditions, the knowledge concerning the influence of moisture on the fatigue life is limited. In this study, the impact of salt water on the fatigue behaviour of a glass fibre reinforced polymer (GFRP) has been investigated experimentally. To overcome the problem of invalid failure during fatigue testing, an improved specimen geometry has been developed. The results show a significant decrease in fatigue life for saturated GFRP specimens. In contrast, a water absorption of 50% of the maximum content showed no impact. This is especially remarkable because static material properties immediately decrease with the onset of moisture absorption. To identify the water absorption induced damage progress, light and scanning electron microscopy was used. As a result, the formation of debondings and cracks in the fibre–matrix interphase was detected in long-term conditioned specimens, although no mechanical loading was applied.

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Section: Details Of Fatigue Testing After Hygrothermal Wet Ageingsupporting

confidence: 53%

Effects of Hygrothermal Ageing on the Interphase, Fatigue, and Mechanical Properties of Glass Fibre Reinforced Epoxy

Gibhardt

Doblies

Meyer³

et al. 2019

Fibers

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“…During a wind turbine's life-time of around 20-30 years, it experiences a high number of load cycles (in the range of 10 8 − 10 9 cycles) [2]. The blade is subjected to repeated flapwise bending from the wind and repeated edge-wise bending from the blade weight combined with the rotation [3]. The main load carrying parts of a wind turbine blade consist of uni-directional (UD) glass fibre composite materials made from non-crimp fabrics (NCF).…”

Section: Introductionmentioning

confidence: 99%

Fatigue damage assessment of uni-directional non-crimp fabric reinforced polyester composite using X-ray computed tomography

Jespersen

Zangenberg

Lowe

et al. 2016

Composites Science and Technology

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“…The fatigue damage mechanisms in glass fibre-reinforced composite materials used for wind turbine rotor blades are closely related to the material architecture and the material systems (Nijssen & Brøndsted, 2011). The damage progression in fibre-reinforced composites can be monitored experimentally and quantified in the measurement of the experimentally observed stiffness degradation (Brøndsted et al, 1996).…”

Section: Fatigue Damagementioning

confidence: 99%

“…This is in order to give an optimised wind flow around the blade, taking the optimal energy out from the wing, to obtain optimal structural performance and aeroelasticity, combining interaction between dynamic loads and structural elasticity and damping, and to ensure material strength and stiffness in the critical load-carrying parts. These topics are described in detail in various chapters elsewhere (Nijssen & Brøndsted, 2011, 2013. The flap-wise longitudinal loads are carried by two longitudinal spars, referred to as the main laminates (beams), separated by one or more webs taking up the shear and edge-wise loads.…”

Section: Blade Design Conceptsmentioning

confidence: 99%