Sandwich structure composite material with elastic core material and preparation method thereof

A composite material and sandwich structure technology, applied in the field of composite materials, can solve the problems of not improving the interface bonding effect between the panel and the core material, poor impact damage resistance, and restricting wider applications, and achieve excellent energy absorption effect, anti- Excellent impact properties and improved interlaminar strength

Inactive Publication Date: 2009-06-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the traditional two-dimensional composite panel has low interlayer strength, is easy to delaminate under impact load, and has poor impact damage resistance; on the other hand, the adhesive interface between the panel and core material is also easy to fall off under impact load
This greatly limits its wider application
[0003] Chinese patent ZL200520018548.5 introduces a stitched lattice composite sandwich panel, the core panel and the composite material panels on both sides are still connected by adhesive

Method used

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  • Sandwich structure composite material with elastic core material and preparation method thereof
  • Sandwich structure composite material with elastic core material and preparation method thereof
  • Sandwich structure composite material with elastic core material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The fiber yarn 3 used for suturing adopts non-alkali untwisted glass fiber roving (Taishan Glass Fiber Co., Ltd. direct non-alkali non-twisting glass fiber roving T910); The cloth is alkali-free glass fiber untwisted square cloth from Taishan Glass Fiber Co., Ltd.; the resin used for resin column 3 adopts the low-viscosity WHUT-UPR unsaturated resin curing system of the Department of Composite Materials of Wuhan University of Technology. First use a puncher to drill the rubber sheet according to the seam spacing Hole 4, then spread the alkali-free glass fiber cloth up and down on the rubber plate, each 2mm thick. Use glass fiber roving to sew the glass fiber cloth and the rubber sheet together by hand, the stitching method is straight lock stitching, and the stitching distance is 20mm. Finally, vacuum-assisted resin transfer molding (VARTM) is used to impregnate the fiber cloth and sutures with resin, and the sandwich structure is solidified as a whole according to th...

Embodiment 2

[0022] The fiber yarn 3 used for suturing adopts aramid fiber (U.S. DuPont Kevlar 49 aramid fibers); the elastic core material 1 adopts butadiene rubber plate with a thickness of 5mm; the composite material panel 2 is 1; —Esys108 room temperature epoxy resin curing system. First use a puncher to drill the rubber sheet according to the seam spacing Hole 4, and then spread the alkali-free glass fiber cloth up and down on the rubber plate, each 3mm. Use aramid fiber to sew the glass fiber cloth and rubber together through an ordinary industrial sewing machine. The stitching method is straight chain stitching, and the stitching distance is 15mm. Finally, vacuum-assisted resin transfer molding (VARTM) is used to impregnate the fiber cloth and sutures with resin, and the sandwich structure is solidified as a whole according to the curing process. The damping ratio of the prepared composite material is 5.2433% by INV-DASP dynamic test and signal analysis system.

Embodiment 3

[0024] The fiber yarn 3 used for suturing adopts non-alkali untwisted glass fiber roving (Taishan Glass Fiber Co., Ltd. direct non-alkali non-twisting glass fiber roving T980); The cloth is alkali-free glass fiber untwisted square cloth from Taishan Glass Fiber Co., Ltd.; the resin used for resin column 3 adopts the low-viscosity WHUT-Esys208 medium-temperature epoxy resin curing system of the Department of Composite Materials of Wuhan University of Technology. First use a puncher to drill the rubber sheet according to the seam spacing Hole 4, then spread the alkali-free glass fiber cloth up and down on the rubber plate, each 2mm thick. Use glass fiber roving to sew the glass cloth and rubber together by hand, the stitching method is straight lock stitching, and the stitching distance is 10mm. Finally, vacuum-assisted resin transfer molding (VARTM) is used to impregnate the fiber cloth and sutures with resin, and the sandwich structure is solidified as a whole according to t...

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Abstract

The invention relates to a composite material of sandwich structure with an elastic core material. The composite material consists of upper and lower composite material panels and a porous elastic core material (1) positioned between the upper and lower composite material panels, which are stitched by fiber yarns (3) passing through holes of the elastic core material, wherein the composite material panels are made of fiber cloths (2) and matrix resins of the composite material. The method for preparing the composite material comprises the following steps: drilling holes on the elastic core material (1) at intervals, laying the fiber cloths (2) on the upper surface and the lower surface of the elastic core material, and making the fiber yarns (3) pass through the holes of the core material by a straight stitching lock type stitching method, to make the core material and the fabric cloths into a whole; making the resin soak the fabric cloths and the holes of the core material by the vacuum assisted resin transfer molding; and finally, solidifying and molding the whole by solidification technology, to obtain the composite material. The material has excellent performance, novel structure and simple preparation technology, is easy to operate, and is applicable to the industrialized production.

Description

technical field [0001] The invention relates to composite materials, in particular to an impact-resistant and energy-absorbing composite material with a sandwich structure and a preparation method thereof. Background technique [0002] Composite sandwich structures have good mechanical properties and low apparent density, and are often used in the field of composite structure design. In the field of shipbuilding and transportation, composite sandwich structures are widely used in many components in composite aircraft, composite boats, and yachts. At present, the core materials of composite sandwich panels at home and abroad are mainly honeycomb and lightweight foam materials, the panels adopt a two-dimensional composite material laminate structure, and the panels and core materials are bonded by bonding. On the one hand, the traditional two-dimensional composite panels have low interlayer strength, are easy to delaminate under impact loads, and have poor impact damage resis...

Claims

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Application Information

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IPC IPC(8): B32B3/24B32B5/06
Inventor 蔡浩鹏王钧王翔杨小利罗涵段华军徐任信
Owner WUHAN UNIV OF TECH
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