Fan blade

Abstract

The invention provides a fan blade. The fan blade comprises a composite material body made of a composite material, wherein at least one part of the composite material body in the chordwise direction is a mixed composite material body, the mixed composite material body provides at least part of blade root and at least part of blade tip of a fan blade body, and the thickness of the mixed composite material body is gradually reduced from the blade root side to the blade tip side in the spanwise direction; and the mixed composite material body comprises a center carbon fiber layer, a first non-carbon fiber layer, a second non-carbon fiber layer, a first carbon fiber layer and a second carbon fiber layer in the thickness direction, the first non-carbon fiber layer and the second non-carbon fiber layer provide at least part of the outer contour of the blade tip, the first carbon fiber layer and the second carbon fiber layer provide at least part of the outer contour of the blade root, and the toughness of non-carbon fibers is greater than that of carbon fibers. According to the fan blade, the shock resistance of the fan blade can be improved, and meanwhile, the rigidity of the fan blade is adjusted.

Description

technical field [0001] The invention relates to a fan blade. Background technique [0002] Large bypass ratio turbofan engines have the characteristics of low fuel consumption, high take-off thrust, low noise, and large windward area, and are widely used in civil transport aircraft. Large size and lightweight fan blades are one of the key components of high bypass ratio turbofan engines. [0003] Composite material blades with metal reinforcement and wrapping are currently one of the schemes for lightweight and large bypass ratio fan blades successfully applied to aero-engines in the world. If the weight reduction effect of lightweight fan blades is measured by the equivalent hollow ratio (the actual blade weight / the weight of a solid titanium alloy blade of the same size), some composite material blades have achieved a weight reduction of more than 60% of the equivalent hollow ratio. Due to the better weight reduction effect, fan blades containing composite materials have...

AI Technical Summary

Problems solved by technology

The inventor believes that the elastic modulus of carbon fiber material is large, and the failure strain (also called failure strain) is small. When the fan blade is subjected to the impact load of bird impact, the fan blade will undergo a large bending deformation, and the upper and lower surfaces of the blade will deform greatly. , it is easy to cause excessive strain on the surface of the fan blade, resulting in cracks, and further damage and fracture of the fan blade

[0005] In addition, the inventor believes that for fan blades woven from the same carbon fiber material, it is difficult to adjust the local toughness and stiffness of the fan blades as required, for example, different thickness positions and blade body positions

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