Sandwich Composite Materials with Cylindrical Cell Structure of Facing Hemispherical Shells

Abstract

The invention discloses a sandwich composite material with an opposite-hemispherical-shell columnar cell structure.Multiple energy-absorption columnar cell units which are each composed of two hemispherical shells and arranged in an up-and-down mode are arranged between a first panel and a second panel, the opening ends of every two corresponding hemispherical shells are connected with the inner side face of the first panel and the inner side face of the second panel respectively, and the two corresponding hemispherical shells are connected with each other or make contact with each other.According to the sandwich composite material, the progressive energy-absorption advantage can be exerted, and the negative influence, caused due to the fact that internal stress peak values of other columnar cell types are higher, on a support structure is avoided.The spherical-shell columnar cell structure does not have a threshold in deformation and energy absorption, and for different types of impacts and vibrating loads, energy can be absorbed through deformation of a columnar cell body; in the deformation and energy absorption processes, the internal stress of the columnar cell structure for bearing the impacts and loads is gradually increased along with deformation, and a larger internal stress peak value cannot occur; machining and making are easy, and industrial production is easy.

Description

technical field [0001] The invention relates to an energy-absorbing sandwich composite material, in particular to a sandwich composite material with a cylindrical cell structure of opposing hemispherical shells and a cylindrical energy-absorbing structure formed by two hemispherical shells facing each other. Background technique [0002] Industrial production, equipment manufacturing, aerospace, and military protection have increasingly high demand for new composite materials that are lightweight, high-strength, energy-absorbing, and vibration-reducing. The sandwich material is generally made of two layers of high-strength thin panels and the middle lightweight core layer by welding or gluing, etc. It combines the advantages of the panel material's bending resistance, strong tensile capacity and the core material's plastic deformation and energy absorption. , and take advantage of the advantages of light weight, high specific strength, high specific stiffness, energy absorpt...

AI Technical Summary

Problems solved by technology

However, there are problems: first, the spatial geometry is complex, the preparation process is complicated, the processing is difficult, and the cost is high; second, there is still a large load "threshold" limit: if it is a combination of hemispherical shell + round tube, it will be completely deformed In the state, the energy absorption value is very large, but in actual engineering, because the impact load is characterized by a short action time, the initial load is large and then rapidly decays

Therefore, when the hemispherical shell first deforms and absorbs energy, due to the rapid reduction of impact load energy, the peak load may not reach the "threshold" of circular tube deformation and energy absorption, so that the circular tube does not deform and absorb energy, thus making the overall energy-absorbing structure absorb energy The efficiency cannot be fully utilized, and the energy absorption efficiency is significantly reduced

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