Bend-Twist Coupling Design and Evaluation of Spar Cap of Wind Turbine Compliance Blade

Wang Yu Liu; Yong Zhang

doi:10.4028/www.scientific.net/AMR.139-141.1400

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 139-141Bend-Twist Coupling Design and Evaluation of Spar...

Bend-Twist Coupling Design and Evaluation of Spar Cap of Wind Turbine Compliance Blade

Abstract:

The bend-twist coupling design method of spar cap of 1.5MW wind turbine blade made by biased hybrid fibers is discussed, and the coupling parameter is established. It is found that flap-twist coupling effect is only related to the laminated materials, not sensitive to the geometry shape. When varying the angle of off-axis carbon fibers from 7.5° to 30° and the volume fraction from 10% to 90%, different bend-twist coupling effect can be obtained. The results show that the optimal angle of spar cap is closer to 18°, and of skins are about 13°. When constraints, such as fibers strain, the in-plane shear stress and Von Mises stress of static index, are added on the blade, the spar cap is optimized with about 45% carbon fiber volume fraction and 18° off-axis angle. Finally, the impact of natural frequencies of dynamic performance on the blade design is proved to be inessential.

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Periodical:

Advanced Materials Research (Volumes 139-141)

Pages:

1400-1405

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.139-141.1400

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Online since:

October 2010

Authors:

Wang Yu Liu, Yong Zhang

Keywords:

Bend-Twist Coupling, Compliance Blade, Fraction of Off-Axis Carbon Fibers, Spar Cap

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