Dual-interlayer symmetrical multi-pyramid configuration three-dimensional integrally-braid lattice composite material and preparation method thereof

Abstract

The invention relates to a dual-interlayer symmetrical multi-pyramid configuration three-dimensional integrally-braid lattice composite material and a preparation method thereof. The composite material comprises an upper panel layer, a middle panel layer, a lower panel layer and lattice core layers arranged between the upper panel layer and the middle panel layer as well as between the middle panel layer and the lower panel layer. The composite material is characterized in that the upper panel layer, the middle panel layer and the lower panel layer form a dual-interlayer structure, the lattice core layers are of a space network truss structure consisting of symmetrical multi-pyramid configuration unit cells arranged periodically and communicated through holes, and the lattice core layers, the upper panel layer, the middle panel layer and the lower panel layer are weaved, alternated, wound and sutured into a whole according to the design rule and are subjected to once resin injection forming by adopting a resin transfer process. The preparation method in the invention comprises the steps of: 1, preparing the upper panel layer, the middle panel layer and the lower panel layer; 2, drilling a needle hole; 3, preparing the lattice core layers; and 4, curing and forming resins. The composite material prepared by the method has better integrity, more excellent mechanical property, lighter mass, higher bearing efficiency and better functionality in comparison with the traditional interlayer structure composite material.

Description

technical field [0001] The invention relates to a textile composite material and its preparation technology, in particular to a three-dimensional integral braided lattice composite material with a double-interlayer symmetrical polygonal pyramid configuration and a preparation process thereof, belonging to the fields of engineering material preparation and structural design. Background technique [0002] Due to the outstanding advantages of high specific stiffness, sandwich structure composite materials are more and more used in the manufacturing sectors of aerospace and ships, and are also receiving more and more attention in engineering. During the manufacturing process of sandwich structures, the quality of the panels and their bonding strength with the sandwich layer are the key factors affecting the performance of the sandwich structure. In the existing sandwich structure composite materials, the upper and lower panels are usually laminated and laminated. The shear stren...

AI Technical Summary

Problems solved by technology

However, at present, the common lattice materials are mostly metal materials, and there are few fiber-reinforced composite materials, and there is also a lack of mature preparation technology for lattice composite materials.

For the existing single sandwich structure lattice composite materials, the lattice cores do not have a high height, that is, the height of the cores in the sandwich is limited, generally not exceeding 30mm, and the lattice cores lack effective support points, When the interlayer height reaches more than 20mm, the core is prone to instability and shear failure occurs, which eventually makes the composite structure unusable

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