Fatigue Life Prediction of Wind Turbine Blade Based on Damage Mechanics

Inhalt:
In order to study the stress distribution characteristics and dangerous weak parts of wind turbine blades, and calculate and analyze its fatigue life. A certain type of wind turbine was taken as the research object in this paper. Firstly, the unidirectional fluid structure coupling numerical analysis method is used to calculate the stress of the blade under different external wind speed conditions and explore its stress distribution characteristics based on ANSYS Workbench. Secondly, based on the classical fatigue damage mechanical life prediction model and comprehensively considering the interaction between strain and stress, a new fatigue damage mechanical life prediction model is proposed. its model parameters are obtained by solving the stress life fatigue data of Glass Fiber Reinforced Composites (GFRC). Finally, the finite element method and the proposed fatigue life prediction model are used to calculate and compare the fatigue life of blades under different working conditions. The results show that the maximum stress of wind turbine blade is located at the root of wind turbine blade. The new fatigue damage mechanics life prediction model proposed in this paper is highly accurate in calculating the fatigue life of wind turbine blades. which has great practical engineering value.