Abstract: As a key component of the connection between wind turbine blade and hub,the blade root bears complex tensile,torsion,shear and other different types of loads. Currently,there are two modeling methods of blade root,one of them is 1/2N or 1/N model that the bolts and the balls of pitch bearing are solid elements,the other is full model that the bolts and the balls of pitch bearing are rod elements. The influence of two kinds of modeling methods on the root verification results is analyzed and verified using finite element analysis software,which is aimed to provide theoretical reference for blade design and simulation,blade root pulling test and so on.

Key words: wind turbine, blade root bolt, finite element simulation, full model of blade root, 1/2N model of blade root