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Recently, low-carbon green energy developing units are getting much attention due to the exhaustion of energy and environmental issues. The wind power generator, a typical low-carbon green energy developing unit, has less influence on the weather. Also, its generation quantity compared to the ground contact area has a point. Moreover, the generation quantity can be expanded through enlarging the surface area of wind power generator’s wind blade. Before, GFRP (Glass Fiber Reinforced Plastic) was the most popularly used material for wind blade of wind power generator. However, the usage of carbon-fiber in lieu of glass fiber continues to increase regarding the efforts to improve the efficiency of the wind power system. The spinning radius of the wings has increased by 30% every year and now the blade is as big as 120m, and the set-up (installation) cost of wind power generator is increasing while the efficiency is reducing.
CFRP composites applied to wind blades are manufactured by lamination sequence and carbon fiber arrangement using unidirectional prepreg sheet. In the additive process, defects such as pores, resin distribution and micro-cracks may occur due to lamination failure
Therefore, In this study the defect characterization was performed by analyzing defect signal of the prepreg CFRP composite using the ultrasonic method
