Reinforced aramid honeycomb sandwich plate

Abstract

The invention relates to a reinforced aramid honeycomb sandwich plate which is composed of an upper skin layer, a middle aramid honeycomb core layer and a lower skin layer, wherein every two adjacentlayers are bonded through an adhesive. The upper skin and the lower skin are each of a three-layer composite structure, and the middle layers are made of aramid pulp. Concave-convex leftover materialsare reserved on the upper edge and the lower edge of the aramid honeycomb core. The wall thicknesses of the hole grids in the middle aramid fiber honeycomb core are the same; or in a certain direction, the wall thickness of the middle hole grid is large, and the wall thicknesses of the hole grids on the two sides are small. The honeycombs of the aramid fiber honeycomb core are hollow, or hollow columns made of aramid fibers are placed in the honeycombs of the aramid fiber honeycomb core. The concave-convex leftover materials are reserved on the upper edge and the lower edge of the aramid honeycomb core, so that the contact area between the aramid honeycomb core and the upper skin and between the aramid honeycomb core and the lower skin is increased, the bonding strength, the bonding strength and the tearing strength are improved, and the aramid honeycomb sandwich plate is not prone to layering. Meanwhile, the middle layer of the upper skin and the middle layer of the lower skin are controlled to be aramid pulp, so that the impact resistance of the aramid honeycomb sandwich plate is improved.

Description

technical field [0001] The invention belongs to the technical field of composite plates and relates to a reinforced aramid honeycomb sandwich plate. Background technique [0002] Carbon fiber composite is a new material with excellent mechanical properties. The characteristics of light weight and high strength make carbon fiber composite materials widely used in the fields of automobiles, high-speed rail and aircraft. Aramid honeycomb core material is a bionic material in the pursuit of lightweight modern It is even more favored. The carbon fiber aramid honeycomb panel is made of carbon fiber composite board as the skin, and the aramid honeycomb as the core material is bonded by adhesive. However, the impact resistance of existing carbon fiber honeycomb panels is poor, and tearing and delamination often occur in practical applications. The cost of re-maintenance makes the use of carbon fiber honeycomb panels more costly. [0003] Considering that the reason for delaminatio...

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Problems solved by technology

[0004] The Chinese Patent Gazette has published an application number: CN110978650A, a patent for invention of a new honeycomb structure and its manufacturing method, which solves the problem that the honeycomb structure cannot meet the requirement of variable strength along a certain radial direction of the cells, but this When the honeycomb structure is glued to the upper and lower skins, because the contact area with the skin is small, the bonding strength is low, which often leads to the delamination of the honeycomb board and core material during use.

[0005] The Chinese Patent Gazette has published an application number: CN110845755A, the invention patent of which is named foamed epoxy film, aramid honeycomb sandwich panel and its preparation method, and provides a foamed epoxy film to protect the honeycomb structure. The strength of the honeycomb panel is improved by performing edge sealing treatment, but the panel is mainly subjected to tensile and compressive loads when subjected to bending loads. The ability of the honeycomb panel mentioned in the patent to withstand bending loads is not strong, and its impact resistance is poor

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