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Gradient lattice energy absorption structure, chiral cell element with programmable rigidity of gradient lattice energy absorption structure and 3D printing method

An energy-absorbing structure and cell technology, applied in the field of chiral cells, can solve problems such as stress concentration, achieve high platform stress, achieve gradient design, and good impact resistance

Active Publication Date: 2021-02-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in size between large and small cells, stress concentration is likely to occur at the junction of cells. Therefore, consideration should be given to improving the mechanical properties of cells without changing the size of the junction between cells to achieve Gradient Design of Structural Properties

Method used

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  • Gradient lattice energy absorption structure, chiral cell element with programmable rigidity of gradient lattice energy absorption structure and 3D printing method
  • Gradient lattice energy absorption structure, chiral cell element with programmable rigidity of gradient lattice energy absorption structure and 3D printing method
  • Gradient lattice energy absorption structure, chiral cell element with programmable rigidity of gradient lattice energy absorption structure and 3D printing method

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Experimental program
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Embodiment 1

[0052] like figure 1 , 2 As shown, the programmable stiffness chiral cell of the present invention includes a cellular structure, the cellular structure includes an upper ring, an upper connecting rod, a middle ring, a lower connecting rod, and a lower ring, wherein:

[0053] The upper ring and the lower ring have the same geometric shape. In the accompanying drawings, the upper ring and the lower ring are both circular rings, and their radius is R 1 . The middle ring can be of any shape, and is arranged between the upper ring and the lower ring, and the axes of the upper ring, the middle ring and the lower ring are all coincident with the central axis of the cell structure.

[0054] The upper connecting rod has several; the two ends of each upper connecting rod are respectively connected with the upper ring and the middle ring and are evenly distributed between the upper ring and the middle ring in an oblique manner, and each upper connecting rod is relative to the cell str...

Embodiment 2

[0061] like Figure 4-6 As shown in the figure, a specific embodiment of the gradient lattice structure of the present invention is disclosed, which includes three cell layers arranged in layers, from top to bottom are the upper cell layer, the middle cell layer and the lower cell layer. cell layer. Alternatively, the cell layer described in the present invention has only two layers, or alternatively, the cell layer described in the present invention has four layers, five layers, . gradient to the bottom.

[0062] Each cell layer includes several cell structures with the same stiffness; for each cell structure in the same cell layer, the upper and lower rings of two adjacent cell structures are connected by beams , while the middle rings of two adjacent cell structures are alternately arranged.

[0063] When the cell layer is multi-layered, between two adjacent cell layers, the upper cell layer is the upper cell layer, and the lower cell layer is the lower cell layer; the u...

Embodiment 3

[0076] The difference between this embodiment and Embodiment 2 lies in that the stiffness variation trend of each cell layer is implemented in different ways. Specifically, in this embodiment, as Figure 7As shown, the diameters of the upper connecting rod and the lower connecting rod of each cell structure on the same axis are set according to the gradient change from top to bottom, that is, the upper connecting rod / lower connecting rod of each cell structure in the upper cell layer The diameter of the connecting rod, the diameter of the upper connecting rod / lower connecting rod of each cell structure in the middle cell layer, and the diameter of the upper connecting rod / lower connecting rod of each cell structure of the lower cell layer are set in descending order; The included angle ϴ, the included angle -ϴ, and the inner diameter of the middle ring of each cell structure on the same axis are correspondingly the same, so as to realize the gradient change of the stiffness of...

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Abstract

The invention discloses a gradient lattice energy absorption structure, a chiral cell element with programmable rigidity and a 3D printing method. The chiral cell element comprises a cell element structure; the cell element structure comprises an upper ring, a middle ring, a lower ring, upper connecting rods and lower connecting rods; the upper ring and the lower ring have the same geometrical shape, and the middle ring is located between the upper ring and the lower ring. A plurality of upper connecting rods are arranged; the two ends of each upper connecting rod are correspondingly connectedwith the upper ring and the middle ring respectively and are obliquely and uniformly distributed between the upper ring and the middle ring; there are several lower connecting rods; the two ends of each lower connecting rod are correspondingly connected with the lower ring and the middle ring respectively and are obliquely and uniformly distributed between the lower ring and the middle ring. Therefore, the cell structure provided by the invention has a deformation behavior of axial compression torsion, and shows a zero Poisson's ratio characteristic in a compression process, i.e., in the compression process, the overall structure of the cell does not expand outwards, so that the cell has relatively high platform stress and good impact resistance.

Description

technical field [0001] The invention relates to a chiral cell with programmable stiffness, which is used to form a lattice structure. [0002] The invention also relates to a gradient lattice energy absorbing structure, especially a gradient lattice energy absorbing structure based on programmable stiffness chiral cells. [0003] The present invention also relates to a 3D printing method for forming the above-mentioned gradient lattice energy absorbing structure. Background technique [0004] The lattice structure has excellent characteristics such as light weight, high specific stiffness, high specific strength, sound absorption and heat insulation, and is increasingly used in automobiles, ships, aerospace and other fields. Functionally graded lattice structure (Functionally graded lattice structure) is a kind of structural optimization design of lattice structure for impact resistance applications. It fails, and can absorb more energy than a uniform lattice structure wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B3/20B32B3/14B32B15/01B22F3/105B33Y10/00
CPCB32B3/20B32B3/14B32B15/01B33Y10/00B32B2307/558B32B2307/56B32B2307/51B22F5/10B22F10/28B22F2999/00B22F2207/11
Inventor 顾冬冬高捷马成龙宋英杰陈威
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS