Recoverable multi-step deformation buffering and energy-absorbing metamaterial structure

Abstract

The invention belongs to the technical field of metamaterials, and provides a recoverable multi-step deformation buffering and energy-absorbing metamaterial structure which is formed by periodically arranging a plurality of unit cells, and each unit cell is composed of a crossed curved beam, an elastic ring, a cuboid frame and a rod; the crossed curved beam consists of two curved beams, and the two groups of crossed curved beams are respectively mounted in two opposite surfaces of the frame and are opposite in bending direction; and the end part of the crossed curved beam is fixedly connected with the cuboid frame. The upper end face and the lower end face of the elastic ring are connected with the middles of the upper cross curved beam and the lower cross curved beam through rods correspondingly, and the middles of the cross curved beams of different unit cells are connected through rods. The faces, not provided with the crossed curved beams, of the cuboid frames are connected in a frame sharing mode. The cross curved beams with the buckling step property and the elastic rings with the geometric large deformation characteristic are used, the unit-cell structure is designed through combination of the cross curved beams and the elastic rings, and the unit-cell metamaterial and the multi-cell metamaterial which have the recoverable multi-step deformation characteristic and can be used for buffering and energy absorption are successfully constructed.

Description

technical field [0001] The invention relates to the field of metamaterials, in particular to a recoverable multi-step deformation buffering energy-absorbing metamaterial structure. Background technique [0002] "Metamaterial" refers to artificial materials with special properties through artificially designed microstructures, which can exhibit extraordinary physical properties that the constituent materials do not have. Metamaterials are also widely used in the field of cushioning and energy absorption, and are mainly divided into two categories: non-recoverable and recoverable metamaterials. Among them, non-recoverable metamaterials mainly use the plastic deformation of materials to absorb energy, which is characterized by high specific energy, but the disadvantage is that they cannot be reused. Recoverable metamaterials mainly use the elastic deformation of materials to absorb energy, can be reused, and have low maintenance costs. Therefore, this type of metamaterial has ...

AI Technical Summary

Problems solved by technology

Invention patent CN201710065664X describes a multi-level safety anti-collision beam assembly based on a multi-stable unit cell structure, which endows the structure with good cushioning and energy absorption capacity through the periodic arrangement of multiple unit cells, but the unit filled in the assembly Cells also have only one force threshold and cannot handle multiple levels of loads

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