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Light dot matrix sandwich structure with impact resistance and self-repairing functions and preparation method of light dot matrix sandwich structure

A sandwich structure and self-repair technology, which is 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, improved specific energy absorption capacity, and lightweight design

Active Publication Date: 2021-11-02
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Light dot matrix sandwich structure with impact resistance and self-repairing functions and preparation method of light dot matrix sandwich structure
  • Light dot matrix sandwich structure with impact resistance and self-repairing functions and preparation method of light dot matrix sandwich structure
  • Light dot matrix sandwich structure with impact resistance and self-repairing functions and preparation method of light dot matrix sandwich structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the lightweight lattice sandwich structure with impact resistance and self-repairing 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 dot matrix core layer extends upward along the center of the bottom surface of the panel and is set as a dot matrix support point, and extends along the dot matrix support point to each bottom corner of the bottom surface of the panel to form dot matrix support rods.

[0036]The lattice 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, and Sarin 8940 ion polymer The compound contains 5.4 mol% of methacrylic acid groups, 30% of which are neutralized with Na+.

[0037] Before using...

Embodiment 2

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

[0040] (1) the lattice sandwich structure is first placed in the mold provided 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 upper and lower sides of the mold, and control EMAA and the upper and lower metal surfaces of the tablet press to not bond by the polyimide film;

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

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

Embodiment 3

[0046] Such as image 3 As shown, the lightweight lattice sandwich structure with impact resistance and self-repairing function, the sample of the self-repairing lattice sandwich structure is used for the ballistic target test, and the face plate and lattice core material of the 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) shown); The lattice core layer is set to a small lattice core layer or a large lattice core layer, and the small lattice core layer uses t c = 0.7mm grid lines, large lattice core layer with t c =1mm grid lines are made; the plate length and width L of the small lattice core layer and the large lattice core layer are all set to 170mm, and the small lattice core layer is stamped with a 60° stamping die to form a small lattice height h c =6.7mm; the large lattice height h formed by stamping the large lattice core layer with a 60° stamping die c = 12 mm.

[0047] Such as ...

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Abstract

The invention belongs to the technical field of impact materials, and aims to provide a light dot matrix sandwich structure with impact resistance and self-repairing functions and a preparation method of the light dot matrix sandwich structure in allusion to the technical problem that high-speed collision can cause large deformation damage of the light sandwich structure in the prior art. The light dot matrix sandwich structure comprises a face plate and a dot matrix core layer, wherein the face plate and the dot matrix core layer are firmly welded in a vacuum welding mode, and 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, so that the self-repairing dot matrix 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 lattice 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 face ...

Claims

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Application Information

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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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