Abstract: Finite element modeling and simulation of various blade root connection configurations were conducted using finite element software. By comparing the simulation results,this study investigates the influence of bolt shank diameter,flange thickness,and applied preload on the static strength and fatigue damage of blade root bolts,aiming to provide theoretical support for the design and development of large-scale wind turbine blades. Simulation results show that as flange thickness increases,both the static strength and fatigue damage of bolts initially decrease and subsequently increase. An increase in bolt shank diameter leads to a reduction in static strength but an increase in fatigue damage. On the other hand,increasing the applied preload enhances the static strength while gradually reducing fatigue damage. The diverse mechanical responses of blade bolts under varying parameters provide important guidance for bolt selection and setting in blade root connections when operating under complex environmental conditions.

Key words: wind turbine, blade root connection bolt, finite element simulation, static strength, fatigue damage