CHAPTER 13 Blade materials, testing methods and structural ...

CHAPTER 13 Blade materials, testing methods and structural design Bent F. S rensen , John W. Holmes , Povl Br ndsted & Kim Branner Ris National Laboratory for Sustainable Energy The Technical University of Denmark. A major trend in wind energy is the development of larger wind turbines for offshore wind farms. Since access to offshore wind turbines is diffi cult and costly, it is of great importance that they operate safely and reliable. The wind turbine rotor blades, which are the largest rotating component of a wind turbine, are designed for an expected lifetime of 20 years. During this period of time, the blades will be subjected to varying loads.

Modern wind turbine blades are structurally advanced constructions utilizing composite laminates, sandwich core materials, gelcoat fi lms and adhesive joints. h L d Matrix Fiber t ~ 100-500 mμ h ~ 1-50 mm H ~ 50-100 mm L ~ 10-60 m d ~ 5-150 mμ R a R 10-50 nm a ~ Face (laminate) Core H t Roughness scale Lamina scale Microscale Laminate scale ...

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  Material, Laminate, Core, Advanced, Core materials

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