An Effective Method for Evaluating the Failure of Wind Turbine Blade Under Various Conditions

Wind turbine blades are critical components of wind turbines. The behavior of a wind turbine blade when operating involves multi-field coupling, requiring a comprehensive and interdisciplinary understanding of its performance under various design load conditions (DLCs). This paper introduces an efficient algorithm for evaluating the strength failure of all finite elements within the blade components. The algorithm utilizes a distributed load application method. It identifies the maximum failure index value and its corresponding DLC for each individual finite element across all load angles of the load envelope. This novel approach rapidly identifies the primary failure DLC at different locations along the blade’s length. To validate the algorithm, a series of aeroelastic response simulations of a 5MW wind turbine blade are conducted. Then, all load angles in load envelope are thoroughly examined, conduct global failure index assessments based on the Hashin laminate failure theory for the skin’s triaxial ply layer and the shear web’s biaxial ply layer of the blade. In essence, this research offers a rapid and accurate algorithm of identifying potential weaknesses. The algorithm is employed to assess the blade’s vulnerability to strength failure, highlighting its practical value in blade strength failure assessment, ensuring the safety and durability of these critical components.