STUDY ON INFLUENCE OF BLADE ROOT STRUCTURE ON LIMIT FATIGUE STRENGTH OF BLADE ROOT BOLTS IN WIND TURBINES

Chen Zhongya; He Xianzhao; Luo Yongshui; Lyu Xufeng; Lu Shijie; Zhou Mengyu

doi:10.19912/j.0254-0096.tynxb.2024-2426

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (5) : 307-313. DOI: 10.19912/j.0254-0096.tynxb.2024-2426

STUDY ON INFLUENCE OF BLADE ROOT STRUCTURE ON LIMIT FATIGUE STRENGTH OF BLADE ROOT BOLTS IN WIND TURBINES

Chen Zhongya, He Xianzhao, Luo Yongshui, Lyu Xufeng, Lu Shijie, Zhou Mengyu

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Abstract

With the accelerating process of large-scale wind turbines, the increase in blade size makes the root studs of wind turbine blades subject to more complex and severe loads. Innovatively exploring the ultimate stress and fatigue strength of root studs is of great significance for ensuring the safe operation of wind turbines. This study proposes a flexible coupling modeling method for root studs of wind turbine blades, which combines a filleted variable-diameter solid and beam elements. Under the given pre-tightening force of the root stud design, the effects of the fillet radius of the variable-diameter section of the root stud, the thickness of the connecting disc, the depth of the counterbore of the bolt sleeve, and the diameter of the thin rod on the ultimate and fatigue strength of the root stud of a certain wind turbine unit are studied. However, it can be improved by increasing the yield utilization rate, and there is an optimal solution for its design. Compared with the traditional modeling method using only equal-cross-section beam elements, the modeling method proposed in this study can accurately simulate the fillet of the variable-diameter section and more precisely reflect the mechanical characteristics of the actual structure. Compared with solid stud modeling, it can significantly reduce the mesh quantity and improve the calculation efficiency. This study provides important theoretical support and technical guidance for the design optimization of the connection structure of root studs of wind turbine blades.

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wind turbines / bolts of blade root / finite element analysis / ultimate stress / fatigue strength

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Chen Zhongya, He Xianzhao, Luo Yongshui, Lyu Xufeng, Lu Shijie, Zhou Mengyu. STUDY ON INFLUENCE OF BLADE ROOT STRUCTURE ON LIMIT FATIGUE STRENGTH OF BLADE ROOT BOLTS IN WIND TURBINES[J]. Acta Energiae Solaris Sinica. 2026, 47(5): 307-313 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2426

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