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Fiber band toughened sandwich structure of honeycomb core body

A sandwich structure, honeycomb core technology, applied in the direction of layered products, metal layered products, synthetic resin layered products, etc., can solve the problems of debonding of the surface-core interface and small contact area of ​​the surface-core interface.

Active Publication Date: 2019-04-05
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the traditional honeycomb core sandwich structure, due to the small contact area of ​​the face-core interface, the surface-core interface of the sandwich structure will still be debonded if only aramid short fiber film is used to toughen the face-core interface.

Method used

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  • Fiber band toughened sandwich structure of honeycomb core body
  • Fiber band toughened sandwich structure of honeycomb core body
  • Fiber band toughened sandwich structure of honeycomb core body

Examples

Experimental program
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Effect test

specific Embodiment 1

[0034] Specific example 1: Sandwich panel with carbon fiber tape toughened aluminum honeycomb, its upper and lower skins are made of 6 layers of unidirectional carbon fiber cloth and LY5288 / HY5289 epoxy resin, wherein the 6 layers of carbon fiber cloth are all orthogonal Laying, the skin height (thickness) is 1.2mm; the aluminum honeycomb aperture is 6mm, the hole wall thickness is 0.06mm, and the height is 10mm; the toughening fiber tape is formed by shearing unidirectional carbon fiber prepreg along the fiber direction, and the width of the carbon fiber tape is about 3mm ;Aramid staple fiber film is made of Kevlar49, with an area density of 12g / m 2 , The short fiber length is about 10mm.

[0035] In a Z-shaped unit in which carbon fiber strips are interspersed with aluminum honeycomb cores, the fiber strips cover two honeycomb units on the surface of a core, and the distance between the two fiber strips is one honeycomb unit cell, such as Figure 4 shown.

[0036] The afor...

specific Embodiment 2

[0043] Specific embodiment 2: have the sandwich panel of carbon fiber band toughened aluminum honeycomb, in a Z-shaped unit that carbon fiber band penetrates aluminum honeycomb core body, fiber band covers three honeycomb unit cells on a core body surface, two fiber bands The distance is one honeycomb unit cell. The sandwich panel preparation process and sample size are the same as in Example 1, and the displacement loading rate of the three-point bending test is 2mm / min.

[0044] Figure 8 The load-displacement curves of sandwich beams with or without fiber tape-toughened aluminum honeycomb core are given when the displacement loading rate is 2mm / min, in which the fiber tape-toughened aluminum honeycomb Both the toughened sandwich beam and the non-toughened sandwich beam have 4 samples participating in the test. It can be seen from the figure that the load-displacement curve of the sample toughened with fiber tape is basically above the load-displacement curve of the untoug...

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Abstract

The invention provides a fiber band toughened sandwich structure of a honeycomb core body. An aramid staple film and a fiber band are added between the honeycomb core body and a skin interface; a transition region is formed on the structure; through the bridging effect of an aramid staple and the connection effect of the fiber band, the contact area and surface-core bond strength of a surface-coreinterface are improved; and the structure is prevented from generating interface debonding damage. Shown by a test result, the fiber band has a crack blocking effect; the large-area debonding of thesurface-core interface can be effectively prevented; the structure is guaranteed to generate overall performance; meanwhile, the toughened sandwich structure can be also used for improving the local rigidity of the structure; and the structure is prevented from generating local buckling damage.

Description

technical field [0001] The invention relates to a sandwich structure of a fiber tape toughened aluminum honeycomb core. The structure can greatly improve the common surface of the sandwich structure on the premise of ensuring light weight and not damaging the mechanical properties of the skin and the core. The core interface is debonded, significantly improving the structural strength and stiffness. Background technique [0002] Carbon fiber sandwich structure is widely used in aerospace, shipbuilding, automobile manufacturing and other fields due to its light weight, high specific strength, high specific modulus, heat and sound insulation, and corrosion resistance. However, the carbon fiber sandwich structure has the problems of poor interface toughness and easy debonding of the face-core interface. At present, the commonly used methods to solve the poor toughness of the interface of the carbon fiber sandwich structure and the easy debonding of the surface-core interface a...

Claims

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Application Information

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IPC IPC(8): B32B3/12B32B3/08B32B27/02B32B27/34B32B15/20B32B15/14B32B15/088B32B9/00B32B9/04B32B27/38B32B27/08B32B27/12B32B33/00
CPCB32B3/08B32B3/12B32B5/02B32B5/26B32B9/045B32B9/047B32B15/088B32B15/14B32B15/20B32B27/08B32B27/12B32B27/38B32B33/00B32B2262/0269B32B2262/106B32B2307/10B32B2307/558B32B2307/714
Inventor 孙直陈红杰石姗姗郭旭
Owner DALIAN UNIV OF TECH
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