Gradient lattice energy-absorbing structure based on chiral cells with programmable stiffness and its 3D printing method

An energy-absorbing structure and cell technology, applied in the field of chiral cells, can solve problems such as stress concentration, and achieve the effects of short processing time, simple processing method and good impact resistance.

Active Publication Date: 2021-12-07
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-absorbing structure based on chiral cells with programmable stiffness and its 3D printing method
  • Gradient lattice energy-absorbing structure based on chiral cells with programmable stiffness and its 3D printing method
  • Gradient lattice energy-absorbing structure based on chiral cells with programmable stiffness and its 3D printing method

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Experimental program
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Effect test

Embodiment 1

[0052] Such as figure 1 , 2 As shown, the chiral cell with programmable stiffness according to the present invention includes a cell structure, and the cell structure includes an upper ring 1, an upper connecting rod 4, a middle ring 2, a lower connecting rod 5, and a lower ring 3, 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 circular rings with a radius of R 1 . The middle ring can be in any shape, and is arranged between the upper ring and the lower ring, and the axes of the upper ring, middle ring, and lower ring coincide with the central axis of the cell structure.

[0054] The upper connecting rods have several pieces; the two ends of each upper connecting rod are respectively connected to the upper ring and the middle ring and are uniformly distributed between the upper ring and the middle ring in an oblique manner, and each upper connecting rod is relative to the ...

Embodiment 2

[0061] Such as Figure 4-6 As shown, a specific embodiment of the gradient lattice structure of the present invention is disclosed, which includes three layers of cell layers arranged in layers, and from top to bottom are the upper cell layer 6-1, the middle cell layer Layer 6-2 and lower cell layer 6-3. Or, the cell layer of the present invention has only two layers, or, the cell layer of the present invention has four layers, five layers... At this time, the rigidity of each cell layer arranged in stacks, from above Gradient change from bottom to top.

[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 , and the middle rings of two adjacent cell structures are arranged alternately.

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

Embodiment 3

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

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Abstract

The invention discloses a gradient lattice energy-absorbing structure and a chiral cell with programmable stiffness thereof, and a 3D printing method. The chiral cell includes a cell structure, and the cell structure includes an upper ring, a middle ring, a lower ring, an upper connecting rod, and a lower connecting rod; the upper ring and the lower ring have the same geometric shape, and the middle ring is located between the upper ring and the lower ring; There are several upper connecting rods; the two ends of each upper connecting rod are connected to the upper ring and the middle ring respectively and are evenly distributed obliquely between the upper ring and the middle ring, and there are several lower connecting rods; the two ends of each lower connecting rod are respectively Correspondingly connected with the lower ring and the middle ring and obliquely evenly distributed between the lower ring and the middle ring. Therefore, the cell structure of the present invention has a deformation behavior of axial compression and torsion, and shows zero Poisson's ratio characteristics during the compression process, that is, the overall cell structure does not expand outward during the compression process. Therefore, the The cell itself has a 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, in particular to a gradient lattice energy-absorbing structure based on programmable rigidity chiral cells. [0003] The present invention also relates to a 3D printing method for forming the 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 the lattice structure for impact resistance applications. Under axial impact, the functionally graded lattice structure has a gradual In c...

Claims

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Application Information

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Patent Type & Authority Patents(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
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