Transcription of CHAPTER 13 Blade materials, testing methods and structural ...
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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. Large wind turbine blades are made of composite materials and can develop a number of interacting failure modes.
weight of a large wind turbine blade also increases the loads on the rotor input shaft and bearings as well as the wind turbine tower and mechanisms used to con-trol yaw and pitch of the blades. Weight savings is therefore of great importance, and signifi cant efforts are devoted by wind turbine companies in the selection of materials.
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