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Composite energy absorption structure based on degradable material and 3D printing process of composite energy absorption structure

A technology of degradable materials and energy-absorbing structures, applied in the field of 3D printing technology, can solve problems such as weak impact resistance, unsatisfactory miniaturization, customized design requirements and product requirements, and achieve the effect of high-efficiency cushioning performance

Inactive Publication Date: 2021-06-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing honeycomb energy-absorbing structures generally present a positive Poisson's ratio macroscopically. The energy-absorbing structure of this single structure is relatively soft and its impact resistance is weak.
At the same time, the manufacturing of honeycomb energy-absorbing structures generally uses the form of large-scale equipment manufacturing and multi-step multi-process molding, which does not meet the miniaturization and customization design requirements and product requirements

Method used

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  • Composite energy absorption structure based on degradable material and 3D printing process of composite energy absorption structure
  • Composite energy absorption structure based on degradable material and 3D printing process of composite energy absorption structure
  • Composite energy absorption structure based on degradable material and 3D printing process of composite energy absorption structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a 3D printing method for a composite energy-absorbing structure based on degradable materials. For details of the composite energy-absorbing structure, see figure 1 As shown, it includes end plates 3 located on both sides, and a negative Poisson’s ratio-honeycomb energy-absorbing region made of degradable material between the two end plates 3, the negative Poisson’s ratio-honeycomb type energy-absorbing area The functional area is composed of honeycomb structure monomer layers and negative Poisson's ratio structure monomer layers arranged alternately in sequence, wherein the honeycomb structure monomer layer is composed of several honeycomb structure monomers 1 arranged side by side, and the negative Poisson's ratio The Poisson's ratio structural monomer layer is composed of several negative Poisson's ratio structural monomers 2 arranged side by side. The inside is bent such that two of the interior angles of the hexagon are greater than 180°). ...

Embodiment 2

[0062] Compared with Embodiment 1, most of them are the same, except that the printing process parameters of this embodiment are as follows:

[0063] Material: PLA;

[0064] Composite structure, the relationship between the size parameters of the two monomers is a=a` or c=c`, where the size range a=4mm, c=8mm, and the range of the angle between two adjacent side walls is α=115 degrees. Side width or wall thickness t is 1.3 mm.

[0065] Layer thickness: 0.2-0.4mm.

[0066] Wire diameter: 1.75mm.

[0067] Nozzle aperture: 0.4mm.

[0068] Printing speed: 40mm / s.

[0069] Printing temperature: 205-225°C, hot bed temperature: 60-70°C.

[0070] Compression and impact tests were carried out on this structure, and the stress-strain curve was obtained. The obtained platform stress range was 3.1-3.4MPa, and the specific energy absorption value Es range was 6.4-6.8KJ / m 3 .The range of stress is 33-38MPa, and the range of strain is 48-55%.

Embodiment 3

[0072] Compared with Example 1, most of them are the same, except that the composite energy-absorbing structure in this example is replaced by figure 2 structure, specifically:

[0073] Two adjacent rows of honeycomb structure monomers 1 of the same honeycomb structure monomer layer are stacked in the form of "side to side", and the same row of honeycomb structure monomers 1 is stacked "bottom to bottom". The forms are arranged side by side; at this time, there is a natural transition between the two layers of monomers, forming a zero-thickness zigzag section. The sides of the honeycomb structural monomer 1 and the negative Poisson's ratio structural monomer 2 are respectively facing the end plate 3, and the side of the honeycomb structural monomer 1 is facing the side of the negative Poisson's ratio structural monomer 2, At this time, b=b', t=t'.

[0074] When the end plate 3 is a honeycomb structure monomer layer, the honeycomb structure monomer layer continues for half a...

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Abstract

The invention relates to a composite energy absorption structure based on a degradable material and a 3D printing process of the composite energy absorption structure. The composite energy absorption structure comprises end plates located on the two sides and a negative Poisson's ratio-honeycomb type energy absorption area which is arranged between the two end plates and is made of the degradable material. The negative Poisson's ratio-honeycomb type energy absorption area is composed of honeycomb structure monomer layers and negative Poisson's ratio structure monomer layers which are sequentially and alternately arranged, and each honeycomb structure monomer layer is composed of a plurality of honeycomb structure monomers which are arranged side by side; and each negative Poisson's ratio structure monomer layer is composed of a plurality of negative Poisson's ratio structure monomers which are arranged side by side, and the section of each negative Poisson's ratio structure monomer is in an infolded hexagon shape. Compared with the prior art, according to the 3D printing method, molten materials are stacked and formed in a layer-by-layer stacking mode, complex modeling can be achieved, meanwhile, the printed composite energy absorption structure can achieve hardness and softness of the energy absorption structure, and the buffering efficiency is achieved more efficiently.

Description

technical field [0001] The invention belongs to the technical field of energy-absorbing structure preparation, and relates to a 3D printing process of a composite energy-absorbing structure based on degradable materials. Background technique [0002] The energy-absorbing structure is the structure that absorbs energy. The traditional porous composite structure represented by the honeycomb structure has high in-plane and out-of-plane stiffness and good energy absorption capacity. For porous structures, plateau stress is an important index to evaluate energy absorption performance. A porous structure with excellent energy absorption capacity should have the characteristics of high platform stress, long duration, and stable platform stress. Existing honeycomb energy-absorbing structures generally present a positive Poisson's ratio macroscopically, and this energy-absorbing structure with a single structure is relatively soft and its impact resistance is weak. At the same time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F7/00B29C64/118B33Y30/00B33Y80/00
CPCB33Y30/00B33Y80/00B29C64/118F16F7/00F16F2224/0225
Inventor 张雪霞严鹏飞严彪
Owner TONGJI UNIV