Abstract: This paper analyzed the structure of a MW-class wind turbine blade. The effects of E glass UD fabric and high modulus glass UD fabric on the blade weight, stiffness, frequency and normal stress safety factor were analyzed. The results showed that using high modulus glass UD fabric could reduce the weight of blade spar caps significantly and increase the safety, while the stiffness is basically retained.

Key words: high modulus glass, wind rotor blade, structural analysis, safety factor