3D printing structure composite material laminboard with negative Poisson's ratio effect and processing method of laminboard

Abstract

The invention discloses a 3D printing structure composite material laminboard with a negative Poisson's ratio effect and a processing method of the laminboard. The 3D printing structure composite material laminboard comprises an upper surface layer, a lower surface layer and a middle core material layer; the upper surface layer and the lower surface layer are made of a composite material formed bycuring fiber cloth and resin, the middle core material layer is a negative Poisson's ratio structure layer through 3D printing, and the structure layer is bonded with the upper surface layer and thelower surface layer through a bonding agent; the negative Poisson's ratio structure layer is formed by arraying negative Poisson's ratio units and connecting the negative Poisson's ratio units throughmiddle rod pieces, the rod pieces are of inwards-concave structures with the auxetic compression negative Poisson's ratio effect, and the cross sections of the rod pieces are square or circular. Thecomposite material laminboard can be used as a surface layer of a sandwich structure, and plays roles in protecting a core material and improving the overall mechanical property; the composite material laminboard also can be used as an anti-collision surface layer for bridges, buildings and the like. And the upper surface layer and the lower surface layer can also be filled with foam to serve as sound insulation plates to achieve the sound insulation effect.

Description

technical field [0001] The invention relates to a sandwich panel material, in particular to a 3D printed structural composite material sandwich panel with a negative Poisson's ratio effect and a processing method thereof. Background technique [0002] It is generally believed that almost all materials have a positive Poisson's ratio, about 1 / 3, rubber materials are 1 / 2, metal aluminum is 0.133, copper is 0.127, and typical polymer foams are 0.11 to 0.14, etc., that is, these The transverse direction of the material shrinks when the material is stretched. The negative Poisson's ratio effect means that when stretched, the material expands laterally within the elastic range; while when compressed, the material shrinks laterally. This phenomenon is thermodynamically possible, but negative Poisson's ratio effects are not generally observed in materials. Some materials with special structures discovered in recent years have a negative Poisson's ratio effect, and have attracted m...

AI Technical Summary

Problems solved by technology

There is no precedent for the use of negative Poisson's ratio materials in sandwich panel core materials in my country. The main reason is that the selection of negative Poisson's ratio structures is difficult and the processing is difficult. Traditional processing methods cannot obtain negative Poisson's ratio structures. Use materials limited to positive Poisson's ratios

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