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Chapter 13 Fatigue Life Prediction for Adhesively Bonded Root Joint of Composite Wind Turbine Blade Using Cohesive Zone Approach

In order to estimate the cost effectiveness of a wind turbine system, the fatigue life of wind turbine blades is an essential step in the design process. The blades of a wind turbine are considered to be the most basic and the most critical component of the wind turbine system. In general the major cause of wind turbine blade failure is fatigue phenomenon, where wind turbine blades are subjected during working conditions to different loads such as aerodynamics, gyroscopic and gravitational forces. These loading conditions will cause fatigue failure of the blade mainly at root joint, where the most critical zone of the blade is located.