Anti-deformation composite airfoil sandwich foam structure and preparation method thereof

The invention relates to an anti-deformation composite material airfoil sandwich foam structure and a preparation method thereof, and belongs to the technical field of composite material design and forming. The anti-deformation composite material airfoil sandwich foam structure comprises at least two arched foam units, the foam units are tightly attached, and gaps between the foam units are filled with fiber strips in the spanwise direction of an airfoil. The anti-deformation composite airfoil comprises upper foam, lower foam, a fiber reinforced bottom plate arranged between the upper foam and the lower foam, and a skin, wherein each of the upper foam and the lower foam comprises at least two arched foam units, the foam units are tightly attached, and gaps among the foam units are filled with fiber strips in the spanwise direction of the airfoil. According to the method, the deformation of the foam under pressure can be obviously reduced, so that the orientation of skin fibers on the surface of the foam is cl