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Lightweight lattice sandwich structure with impact-resistant self-healing function and preparation method thereof

A sandwich structure and self-healing technology, applied in the field of impact materials, can solve the problems of large deformation and damage of lightweight sandwich structures, and achieve the effect of rapid impact resistance and self-healing ability, excellent bending mechanical properties, and lightweight design.

Active Publication Date: 2022-05-24
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problem that high-speed collisions in the prior art can cause large deformation damage to lightweight sandwich structures, the purpose of the present invention is to provide a lightweight lattice sandwich structure with impact-resistant self-repair function and its preparation method. technology, the EMAA material with impact resistance and self-repairing function is filled in the core material space of the lightweight sandwich structure, and a self-repairing lattice sandwich structure with self-repairing function is obtained

Method used

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  • Lightweight lattice sandwich structure with impact-resistant self-healing function and preparation method thereof
  • Lightweight lattice sandwich structure with impact-resistant self-healing function and preparation method thereof
  • Lightweight lattice sandwich structure with impact-resistant self-healing function and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] like figure 1 As shown in the figure, the lightweight lattice sandwich structure with impact resistance and self-healing function is characterized in that it includes a panel and a lattice core layer, the panel and the lattice core layer are firmly welded by vacuum welding, and the panel is set as a hollow cube In the frame structure, the lattice core layer extends upward along the center of the bottom surface of the panel to form lattice support points, and extends along the lattice support points to each bottom corner of the bottom surface of the panel to form lattice support rods.

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

[0037] The sarin 8940...

Embodiment 2

[0039] like figure 2 As shown in the figure, the preparation method of the lightweight lattice sandwich structure with impact-resistant self-healing function specifically includes the following steps:

[0040] (1) The lattice sandwich structure is first placed in the mold set by the asbestos rope, the mold height is 25mm, and the mold height is greater than the height of the lattice sandwich structure;

[0041] (2) Fill the mold with EMAA particles again, place a layer of polyimide film on the top and bottom of the mold, and control EMAA to not bond with the upper and lower metal surfaces of the tablet press through the polyimide film;

[0042] (3) Set the temperature of 150°C on both the upper and lower tablet presses of the tablet press, apply an initial pressure of 5kN to the sample, and continue to apply pressure until the inner space of the lattice sandwich structure is completely filled with EMAA material;

[0043] (4) Then, turn off the heating function of the tablet ...

Embodiment 3

[0046] like image 3 As shown, the lightweight lattice sandwich structure with impact resistance and self-healing function, the self-healing lattice sandwich structure sample is used for ballistic target test, the panel and lattice core material of lattice sandwich structure are all made of 304 stainless steel , the thickness of the panel is set to 1.05mm (such as image 3 (a)); the lattice core layer is set as a small lattice core layer or a large lattice core layer, and the small lattice core layer uses t c = 0.7mm grid line, large lattice core layer with t c =1mm grid lines; the length and width L of the small lattice core layer and the large lattice core layer are both set to 170mm, and the small lattice core layer is punched with a 60° stamping die to form a small lattice height h c =6.7mm; the large lattice height h formed by punching the large lattice core layer with a 60° stamping die c =12mm.

[0047] like image 3 (a), image 3 As shown in (a1), the size of th...

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Abstract

The invention belongs to the technical field of impact materials. 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 invention is to provide a lightweight lattice sandwich structure with impact-resistant and self-repairing functions The preparation method thereof comprises a face plate and a dot matrix core layer, the face plate and the dot matrix core layer are firmly welded by vacuum welding, and the EMAA material with impact resistance and self-repairing function is filled in the core of a lightweight sandwich structure through a compression molding process In the material space, a self-healing lattice sandwich structure with self-healing function was obtained. Verification of the self-healing function of a novel self-healing lightweight sandwich structure using a ballistic target impact test. The bending mechanical response and energy absorption behavior of a novel self-healing lightweight sandwich structure were studied by three-point bending test. A new type of self-healing lightweight sandwich structure that integrates self-healing and lightweight has great potential applications 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 lattice sandwich structure with impact-resistant self-repairing 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. investigated the response of lightweight sandwich structures under compressive and shock loads by means of experiments and finite element simulations. Yungwirth, Wadley et al. studied the ballistic response and failure mechanism of sandwich panels at different impact velocities. Dharmasena, Wadley et al. studied the deformation and capacity absorption behavior of lightweight sandwich structures under blast loading, describing the failure mechanism of the pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B15/18B32B3/08B32B3/22B29C39/10F41H5/04
CPCB32B15/011B32B3/08B32B3/18B29C39/10F41H5/0442B32B2571/02B32B2307/546B32B2307/718B32B2307/56B32B2605/10B32B2605/18
Inventor 陈玉超郭雅悰魏延鹏
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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