Abstract: According to the current general surface treatment method of composite core materials, the core material simulation model based on ANSYS is used to predict its out of plane shear modulus, and the theoretical calculation results of the classical sheet model of composite material mechanics are checked with it, and the two results coincide with each other. Based on the results of the simulation model, the influence of different factors on the shear modulus of the core material is further discussed. The results show that the core material has higher shear modulus when the hole diameter is 2 mm, the width of the deep groove is 1.2 mm, the height of the deep groove bottom is 2 mm and the height of the shallow groove is 3 mm. The test results show that the error value between the two is 1.74%, which is within the acceptable range. The design concept of "simulation first, then verification though experiment" is efficient, time-saving and labor-saving. At the same time, comparing the simulation results with Wang Yaoxian′s semi-empirical formula, it is found that when p=2.047, the error value between the two is no more than 0.97%, and the coincidence is good. The empirical formula can be used to predict the simple form of core shear modulus.

Key words: wind turbine blade, composite materials, sheet model theory, ANSYS, PVC core material, shear performance, Wang Yaoxian′s semi-empirical formula