Transcription of CHAPTER 13 Blade materials, testing methods and structural ...
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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. Large wind turbine blades are made of composite materials and can develop a number of interacting failure modes. High structural reliability can be achieved by designing the blades against the develop-ment of these failure modes.
scale blade testing including some results for blades tested to failure (Section 3) that leads to a classifi cation of common failure modes (Section 4). The material properties that control the development of the various failure modes are presented in Section 5. Section 6 describes experimental methods for determination of these properties.
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