Forming method of resin matrix composite with double layers of foam sandwich structures

Abstract

The invention discloses a forming method of a resin matrix composite with double layers of foam sandwich structures, the entire forming preparation of the resin matrix composite with double layers of foam sandwich structures is realized by adopting a liquid forming method, the forming method comprises the following steps: on a mold which can heat, employing a step-by-step dipping technology, dipping a lower-layer pre-formed body in a pre-formed body of the double layers of sandwich structures in a Z direction by using a resin film infusion method, and then guiding fluid resin by using a vacuum infusion molding process to dip upper-layer pre-formed body and a middle layer pre-formed body in the pre-formed body of the double layers of sandwich structures; after dipping, carrying out co-curing forming on the upper, middle and lower layers of pre-formed bodies and two foam sandwiches clamped between the upper, middle and lower layers of pre-formed bodies, so as to obtain the resin matrix composite with double layers of foam sandwich structures, wherein the upper, middle and lower layers of pre-formed bodies and the two foam sandwiches are thoroughly dipped by resin. The forming method has the advantages of simplicity in operation, environment protection, low cost, high functionality and the like, and is especially suitable for the forming preparation of a large-size composite material component.

Description

technical field [0001] The invention belongs to the technical field of processing dimension-reinforced resin-based composite materials, and in particular relates to a molding method of a resin-based composite material with a sandwich structure. Background technique [0002] Since the sandwich structure appeared in the 1940s, its main features are high bending rigidity and light structure weight, that is, the sandwich structure has high specific strength and specific modulus, and has good fatigue resistance and vibration resistance. It has excellent properties such as heat insulation, and can effectively absorb impact energy. At the same time, it can meet the requirements of various service conditions by selecting appropriate panels, core materials and adhesives. Therefore, it has always been an important "structural material" in aerospace engineering. ". [0003] The molding of the sandwich structure generally adopts the pre-molding of the panel and the core material and th...

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Problems solved by technology

[0009] (2) There is a transitional state in the damage form of the double-layer sandwich structure, and it does not mean that the entire structure will fail once the outer panel is damaged

[0011] As far as the manufacturing process is concerned, the single-layer foam sandwich structure can be formed by low-cost vacuum injection molding. The VIMP process can soak the upper and lower preforms in a single-layer sandwich structure, and then solidify the molded product as a whole; but for the double-layer foam sandwich structure, due to the isolation of the double-layer foam core material, this type of structure cannot be used. The VIMP process achieves low-cost overall preparation. Like the single-layer sandwich structure, holes (guide holes) are opened in the foam core material. The traditional VIMP process, which is mainly in-plane impregnation, can penetrate the double-layer sandwich structure. The upper and middle layer preforms, but the lower layer preform cannot be completely saturated to produce acceptable quality double-layer sandwich composite structures

Especially after the solid flame retardant filler is added to the resin system, the fluidity of the resin decreases, making it more difficult to penetrate the lower preform, and it is impossible to integrally form a large-size double-layer sandwich composite structure with good impact resistance

[0012] It can be seen that although the performance of the double-layer sandwich structure is good, its manufacturing process is not simple. It is necessary to preform the three-layer panel and the two-layer sandwich respectively before bonding and curing. Guaranteed, these shortcomings limit the popularization and application of double-layer sandwich structure

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