Forming technique for large-curvature composite foam sandwich structure

Abstract

The invention discloses a forming technique for a large-curvature composite foam sandwich structure. According to the forming technique for the large-curvature composite foam sandwich structure, PVC foam provided with array reinforced holes is used as a core material, a sandwich preform is prepared under the heating auxiliary vacuum condition, fiber reinforced materials and the preform are laid in a mold, a resin system is poured into the forming mold through the vacuum auxiliary forming technique, demolding is conducted after curing, and thus the large-curvature composite foam sandwich structure is obtained. The large-curvature composite foam sandwich structure obtained through the method has good overall performance, high stripping strength and high forming precision.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a forming process method of a large-curvature composite material foam sandwich structure. Background technique [0002] The sandwich structure of composite materials consists of three parts. The outermost layer is the panel, which mainly bears the normal stress caused by bending deformation. It is made of high-strength and high-modulus materials, such as laminated carbon fiber or glass fiber cloth; the middle is the core material. Provide enough section moment of inertia for the sandwich structure, mainly bear the shear stress, commonly used honeycomb, foam, balsa and other materials. There is an adhesive layer between the panel and the core material, and the two are bonded together by resin, such as unsaturated polyester, vinyl resin, epoxy resin, phenolic resin, etc. are commonly used. [0003] The composite material sandwich structure not only makes full use of ...

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Problems solved by technology

[0004] In my country, honeycomb is mostly used as the core material in the composite sandwich structure, but the contact area between the face plate and the core material of the honeycomb sandwich structure is small, so its bonding performance is relatively weak.

In addition, our country also has a composite material sandwich structure with polyurethane foam as the core material, but the interface structure between the panel and the core material is simple, which may easily lead to serious consequences such as degumming and peeling of the panel. The capacity is low, so the tensile capacity of the fiber panel cannot be fully utilized, so that the sandwich structure cannot be widely used