Abstract: Three-dimensional topological design of composites microstructure of large-scale wind turbine blade was conducted to achieve its lightweight properties in this paper. By homogenization theory, the effective elasticity of composite reinforced by carbon fiber was derived from the equivalent homogenized microstructure. Optimization model was established by using solid isotropic material with penalization (SIMP) model to build the relationship between the design variables and the macroscopic elastic modulus. In the model, the relative density of each element was defined as design variables, the volume fraction of overall solid material as optimization constraints,the weighted sum of main diagonal elements of the equivalent elasticity modulus matrix as objectives. Optimality criteria combined with sensitivity filter technique was applied to control the distribution of the material. The problem was solved under MATLAB platform. Numerical results of different objectives show correctness and efficiency of the proposed optimization model and have some influences on the lightweight design of wind turbine blade.

Key words: wind turbine blade, lightweight, composite, homogenization, topology optimization