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Reinforced unit cell structure, preparation method and application thereof and sandwich panel

A sandwich panel and unit cell technology, applied in the field of reinforced materials, can solve the problems of incompetent anti-explosion, anti-penetration, impact resistance, and inability to meet safety standards.

Active Publication Date: 2021-05-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each of these structures has different characteristics, but none of them are competent in the three major fields of anti-explosion, anti-penetration, and anti-impact.
Although the addition of foamed aluminum or other materials to honeycomb panels can barely cope with the problems of anti-explosion and anti-penetration (the overall quality of the structure increases), but it still cannot meet the safety standards for vertical 90° frontal high-speed collisions

Method used

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  • Reinforced unit cell structure, preparation method and application thereof and sandwich panel
  • Reinforced unit cell structure, preparation method and application thereof and sandwich panel
  • Reinforced unit cell structure, preparation method and application thereof and sandwich panel

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] The present invention also provides a method for preparing the reinforced unit cell structure described in the above technical solution, comprising the following steps:

[0047] Fix the welding torch on the spindle of the CNC machine tool, and input the finished product parameters in the CNC machine tool;

[0048] Start the welding machine and use the welding torch to preheat the substrate;

[0049] Start the wire feeder and send the wire to the bottom of the welding torch;

[0050] The welding torch heats the wire material, and the resulting melt falls onto the substrate to form a molten pool, and printing starts to obtain the reinforced unit cell structure.

[0051] In the present invention, the welding torch is preferably covered with a metal ring; a threaded hole is opened in the metal ring, and matching screws in the threaded hole fix the welding torch on the spindle of the numerically controlled machine tool.

[0052] In the present invention, the printing param...

Embodiment 1

[0078] A sandwich panel: the upper and lower panels are 1mm thick TC4 boards; the sandwich layer is a single-layer reinforced unit cell structure, with 5 layers in the X direction, 1 layer in the Y direction, and 5 layers in the Z direction, with a total of 25 unit cells. The length, width and height of each unit cell are 7mm, the length of the bar is 4.95mm, and the radius of the bar is 0.3mm; the total thickness of the whole assembly is 9mm; the material of the sandwich layer is TC4.

[0079] Sandwich panels are printed using laser selective melting technology.

[0080] Test of sandwich panels against vertical 90° frontal high-speed collision:

[0081] The penetrating object is a tungsten steel ball with a diameter of 10mm, and its incident velocity is 350m / s (simulating the exit velocity of ordinary pistols and submachine gun projectiles), ignoring the influence of gravity.

[0082] The resulting speed-time graph of the steel ball is shown in Figure 9 shown. From Figu...

Embodiment 2

[0084] A sandwich panel: the upper and lower panels are 2mm thick TC4 boards; the sandwich layer is a single-layer reinforced unit cell structure, with 5 layers in the X direction, 1 layer in the Y direction, and 5 layers in the Z direction, with a total of 25 unit cells. The length, width and height of each unit cell are 7mm, the length of the bar is 4.95mm, and the radius of the bar is 0.3mm; the total thickness of the whole sandwich panel is 9mm; the material of the sandwich layer is TC4.

[0085] Sandwich panels are printed using laser selective melting technology.

[0086] Numerical Simulation of TNT Explosion

[0087] Place 5g of TNT at a position 40mm from the center of the panel on the sandwich panel for explosion, the effect picture is as follows Figure 10 shown. From Figure 10 It can be seen that each unit cell is squeezed, and the overall structure is evenly stressed, which can effectively absorb energy.

[0088] Figure 11 It is the energy absorption-time cu...

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Abstract

The invention provides a reinforced unit cell structure, a preparation method and application thereof and a sandwich panel, and belongs to the technical field of additive materials. The reinforced unit cell structure provided by the invention comprises an octagonal lattice structure and a BCC body-centered cubic lattice structure, wherein in a stress mode, the octagonal lattice structure consists of 40 same rod pieces, from the total volume of the space, the octagonal lattice structure is composed of 28 same rod pieces, and the rod pieces of the BCC body-centered cubic lattice structure make contact with the eight rod pieces of the octahedron of the inner layer of the octagonal lattice structure. According to the invention, the parts, prone to buckling, of the octagonal lattice structure in the external force bearing process are reinforced through the BCC body-centered cubic lattice structure, so that the overall rigidity of the octagonal lattice structure is improved; and the sandwich panel prepared by utilizing the reinforced unit cell structure not only can be used as an energy absorption structure in the explosion impact process to absorb energy generated by external explosion impact waves, but also has outstanding penetration resistance when resisting high-speed impact of foreign matters such as elastic sheets and the like.

Description

technical field [0001] The invention relates to the technical field of reinforced materials, in particular to a reinforced unit cell structure, its preparation method and application, and a sandwich panel. Background technique [0002] Sandwich panels are composed of upper and lower panels with extremely high density and sandwich parts with relatively low density. Compared with the entity of the same volume and the same material, the sandwich panel has the characteristics of light weight, high strength, and high specific energy absorption ratio. At the same time, adding different materials such as ceramics, resin rubber, and aluminum foam to the internal gap of the sandwich layer can further improve its anti-explosion energy absorption, anti-penetration and other characteristics, and adding radar absorbing materials can also have the characteristics of stealth materials . [0003] In the field of safety protection, the sandwich lattice structure manufactured by combining t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01B32B3/12F41H5/04B22F10/18B22F10/64B33Y10/00B33Y40/20B33Y80/00
CPCB32B15/01B32B3/12F41H5/0421F41H5/0457B22F3/00B22F3/24B33Y10/00B33Y40/20B33Y80/00B32B2250/40B32B2571/02B22F2003/248Y02P10/25
Inventor 廉艳平韩松宇刘长猛陈嘉伟敬晨晨
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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