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Light honeycomb sandwich structure with impact resistance and self-repairing functions and preparation method thereof

A honeycomb sandwich and self-repair technology, applied in the field of impact materials, can solve the problems of large deformation and damage of lightweight sandwich structures, and achieve the effects of rapid impact resistance and self-repair ability, excellent bending resistance, and excellent load-displacement response

Active Publication Date: 2021-11-02
北京中科力信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problem in the prior art that high-speed collisions can cause large deformation damage to lightweight sandwich structures, the purpose of the present invention is to provide lightweight honeycomb sandwich structures with impact-resistant and self-repairing functions and their preparation methods

Method used

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  • Light honeycomb sandwich structure with impact resistance and self-repairing functions and preparation method thereof
  • Light honeycomb sandwich structure with impact resistance and self-repairing functions and preparation method thereof
  • Light honeycomb sandwich structure with impact resistance and self-repairing functions and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 As shown, the lightweight honeycomb sandwich structure with impact resistance and self-repairing function includes an upper panel, a lower panel and a honeycomb core layer. The upper panel and the lower panel are respectively welded to the upper end surface and the lower end surface of the honeycomb core layer by vacuum welding. Both the above-mentioned upper panel and the lower panel are arranged in a planar structure, and the honeycomb core layer is arranged in a hollow hexagonal block structure (a hollow prism structure with a regular hexagonal cross-section).

[0036]The honeycomb core layer is filled with self-healing EMAA material. The self-healing EMAA material is DuPont's Sarin 8940 resin material. The self-healing EMAA material is a partially neutralized ethylene-methacrylic acid polymer, Sarin 8940 ionomer Contains 5.4 mol% of methacrylic acid groups and 30% of which are neutralized with Na+.

[0037] The self-healing EMAA material was placed in...

Embodiment 2

[0039] like figure 2 As shown, the preparation method of the lightweight honeycomb sandwich structure with impact resistance and self-repairing function specifically includes the following steps:

[0040] (1) First paste the lower panel and the honeycomb core layer with glue, and then place it in the mold provided by the asbestos rope. The mold height is 25mm, which is greater than the height of the honeycomb sandwich structure;

[0041] (2) the space of the honeycomb core layer and the mold are filled with EMAA particles, and a layer of polyimide film is placed on the upper and lower sides of the mold to prevent EMAA from bonding with the upper and lower metal surfaces of the tablet press (this One step is temporarily not placed on the panel);

[0042] (3) Set the upper and lower tablet presses of the tablet press at a temperature of 150 ° C, apply an initial pressure of 1 kN to the sample prepared in step (2), and gradually apply pressure until the internal space of the ho...

Embodiment 3

[0047] Self-healing honeycomb sandwich structure samples such as image 3 As shown, the lightweight honeycomb sandwich structure with impact resistance and self-repairing function is used for ballistic target test, the thickness h of the honeycomb core layer is set to 10mm, the wall thickness t of the honeycomb core layer is set to 0.06mm, and the honeycomb core layer Set as a small honeycomb interlayer or a large honeycomb interlayer, the side length L of the small honeycomb interlayer is set to 8mm; the side length L of the large honeycomb interlayer is set to 15mm.

[0048] The upper panel, the lower panel and the honeycomb core layer are all made of stainless steel.

[0049] like image 3 (a), image 3 As shown in (a1), the size of the three-point bending test sample of the empty honeycomb sandwich panel is 170*35*12mm, and the mass is about 150g; image 3 As shown in (a2), the external size and mass of the self-repairing honeycomb sandwich panel are about 200g; the pur...

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Abstract

The invention belongs to the technical field of impact materials, and discloses a light honeycomb sandwich structure with impact resistance and self-repairing functions and a preparation method of the light honeycomb sandwich structure in allusion to the technical problem that high-speed collision in the prior art can cause large deformation damage of the light honeycomb sandwich structure. The light honeycomb sandwich structure comprises an upper face plate, a lower face plate and a honeycomb core layer, wherein the upper face plate and the lower face plate are welded to the upper end face and the lower end face of the honeycomb core layer in a vacuum welding mode respectively, the core material space of the light sandwich structure is filled with an EMAA material with the impact resistance and self-repairing functions through the compression molding technology, and the self-repairing honeycomb sandwich structure with the self-repairing function is obtained. The self-repairing function of the novel self-repairing light sandwich structure is verified by utilizing a ballistic target impact test. The bending mechanical response and the energy absorption behavior of the novel self-repairing light sandwich structure are researched by utilizing a three-point bending test. The novel self-repairing light sandwich structure integrates self-repairing and light weight, and has important potential application in many industrial fields.

Description

technical field [0001] The invention belongs to the technical field of impact materials, and in particular relates to a lightweight honeycomb sandwich structure with an impact-resistant self-repair function and a preparation method thereof. Background technique [0002] Due to the characteristics of light weight, high specific strength, high specific stiffness and impact resistance, lightweight sandwich structures are widely used in packaging engineering, aircraft skins, high-speed rail skins and other fields. Zhang et al. studied the response of lightweight sandwich structures under compressive and impact loads by means of experiments and finite element simulations. Yungwirth, Wadley et al. studied the ballistic response and failure mechanism of sandwich panels under different impact velocities. Dharmasena, Wadley et al. investigated the deformation and energy absorption behavior of lightweight sandwich structures under blast loads, describing the failure mechanisms of fac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01B32B15/18B32B3/08B32B3/12B32B7/12B32B37/12B32B37/10B32B37/06B32B38/00B29D99/00F41H5/04
CPCB32B15/011B32B3/08B32B3/12B32B7/12B32B37/12B32B37/10B32B37/06B32B38/00B29D99/0089F41H5/0442B32B2571/02B32B2307/546B32B2307/718B32B2307/558B32B2605/10B32B2605/18
Inventor 杨喆孙超男
Owner 北京中科力信科技有限公司
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