Multilayered composite material foam sandwich board and preparation method

Abstract

The invention provides a multilayered composite material foam sandwich board and a preparation method. The multilayered composite material foam sandwich board is prepared from foam sandwiches, fibersand resin, wherein at least three layers of the foam sandwiches are arranged; each layer of the foam sandwich is formed by arraying unit modules; a resin filling groove is formed in an outer wall of each foam sandwich unit module; the fibers are distributed on the surfaces, except end parts, of each foam sandwich unit module; the resin is filled through the filling grooves and penetrates into thefibers; after the resin is cured, the foam sandwiches, the fibers and the resin form a whole body. According to the multilayered composite material foam sandwich board provided by the invention, the manufacturing cost is effectively reduced and the mechanical properties are improved; the preparation method of the multilayered composite material foam sandwich board, provided by the invention, adopts a groove type vacuum injection molding technology to distribute a flow channel on the surface of a core material and a mold is filled with the resin through the flow channel. The groove type vacuuminjection molding technology has the advantages that a high-penetration medium and a stripping material are not added, so that the preparation method is simple in technology and low in cost, and is especially suitable for preparing large-size, reinforced and sandwich abnormal-shaped structural parts.

Description

technical field [0001] The invention relates to a composite material, and the invention also relates to a preparation method of the composite material. Specifically, it relates to a multi-layer composite material foam sandwich panel and a preparation method thereof. Background technique [0002] The composite material sandwich structure increases the moment of inertia of the section through the core material to obtain higher bending strength and stiffness, and the use of composite material sandwich components can obtain better energy absorption capacity. A large number of experimental studies have proved that the use of composite material structure As an energy absorbing component, it has a higher energy absorbing capacity than some commonly used metal material structures, and the crushing load is evenly distributed. It has been gradually applied in the protection engineering fields such as ships, aerospace, and transportation. [0003] There are many types of composite san...

AI Technical Summary

Problems solved by technology

Although many research results show that sewing and Z-Pinning technology can improve the surface-core bonding strength of the sandwich structure and enhance the mechanical properties of the foam core layer, but due to the complexity of the process, high cost, and low production efficiency, it is rarely used.

In addition, in sewing and Z-Pinning technology, fiber or metal needles are inserted into the panel, causing fiber filament bending and resin enrichment in the panel, which will destroy the integrity of the panel and weaken the mechanical properties of the panel itself

In addition, the thickness of the composite foam sandwich panel is generally not large, and it is often a single-layer structure, so the bending strength, stiffness and energy absorption effect of the panel normal direction of the composite foam sandwich panel are limited.

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