Sandwich structure composite material with elastic core material and preparation method thereof

Abstract

The invention relates to a composite material of sandwich structure with an elastic core material. The composite material consists of upper and lower composite material panels and a porous elastic core material (1) positioned between the upper and lower composite material panels, which are stitched by fiber yarns (3) passing through holes of the elastic core material, wherein the composite material panels are made of fiber cloths (2) and matrix resins of the composite material. The method for preparing the composite material comprises the following steps: drilling holes on the elastic core material (1) at intervals, laying the fiber cloths (2) on the upper surface and the lower surface of the elastic core material, and making the fiber yarns (3) pass through the holes of the core material by a straight stitching lock type stitching method, to make the core material and the fabric cloths into a whole; making the resin soak the fabric cloths and the holes of the core material by the vacuum assisted resin transfer molding; and finally, solidifying and molding the whole by solidification technology, to obtain the composite material. The material has excellent performance, novel structure and simple preparation technology, is easy to operate, and is applicable to the industrialized production.

Description

technical field [0001] The invention relates to composite materials, in particular to an impact-resistant and energy-absorbing composite material with a sandwich structure and a preparation method thereof. Background technique [0002] Composite sandwich structures have good mechanical properties and low apparent density, and are often used in the field of composite structure design. In the field of shipbuilding and transportation, composite sandwich structures are widely used in many components in composite aircraft, composite boats, and yachts. At present, the core materials of composite sandwich panels at home and abroad are mainly honeycomb and lightweight foam materials, the panels adopt a two-dimensional composite material laminate structure, and the panels and core materials are bonded by bonding. On the one hand, the traditional two-dimensional composite panels have low interlayer strength, are easy to delaminate under impact loads, and have poor impact damage resis...

AI Technical Summary

Problems solved by technology

On the one hand, the traditional two-dimensional composite panel has low interlayer strength, is easy to delaminate under impact load, and has poor impact damage resistance; on the other hand, the adhesive interface between the panel and core material is also easy to fall off under impact load

This greatly limits its wider application

[0003] Chinese patent ZL200520018548.5 introduces a stitched lattice composite sandwich panel, the core panel and the composite material panels on both sides are still connected by adhesive bonding, and the core panel is a plane made of multiple composite material laminates embedded in each other Lattice grid panels, whose outer panels are stitched composite panels. This design can rely on stitching the outer panels of composite materials to improve its impact resistance to a certain extent, but it does not improve the interface bonding effect between the panel and the core material.

[0004] Relevant patent databases have been searched, so far, no technology identical to the present invention has been found

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