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Reinforcing sheet design and reinforcing method for fiber composite material opening workpiece

A technology of fiber composite materials and composite materials, which is applied in the field of reinforcement sheet design and reinforcement at openings, and can solve problems such as low work efficiency, low reliability of reinforcement structures, tedious and time-consuming reinforcement sheet design, etc.

Active Publication Date: 2013-02-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the poor reinforcement effect, low reliability of the reinforcement structure, difficult quality control, cumbersome process, low work efficiency, cumbersome and time-consuming reinforcement piece design existing in the existing fiber composite material perforation part reinforcement method. and other problems, it provides a reinforcement sheet with the advantages of simple design, universal application, excellent reinforcement effect, no need for cutting, and suitable for mass production.

Method used

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  • Reinforcing sheet design and reinforcing method for fiber composite material opening workpiece
  • Reinforcing sheet design and reinforcing method for fiber composite material opening workpiece
  • Reinforcing sheet design and reinforcing method for fiber composite material opening workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Example 1: Reinforcement Experiment of Carbon Fiber / Epoxy Resin Composite Open-hole Laminate with Integrated Curing RTM Molding Process

[0125] In this embodiment, the open-hole product of fiber composite material is a carbon fiber / epoxy resin composite open-hole laminate prepared by two layers of Toray T700 12K four-axis carbon fiber warp-knitted fabric, and the layup is [0 / +45 / 90 / -45]s, the composite laminate is subjected to uniaxial tensile load, its structure and the direction of the tensile load are as follows figure 1 As shown; the hole diameter Φ of the hole is 20mm; the reinforcement sheet 4 is prepared from Toray T700 12K carbon fiber tow without resin matrix, and the reinforcement sheet 4 and the carbon fiber / epoxy resin composite material perforated laminate are prefabricated. Molded body 3 Figure 5 The integrated curing RTM molding process shown in the figure obtains a carbon fiber / epoxy resin composite laminate reinforced with openings. The specific me...

Embodiment 2

[0141] Example 2: Reinforcement Experiment of Open Cell Glass Fiber / Epoxy Resin Composite Laminates by Secondary Curing Vacuum Assisted Resin Injection Molding Process

[0142] In this embodiment, the fiber composite material perforated part 1' is made of 4 layers of EW400-1000 glass fiber plain weave cloth to prepare a glass fiber / epoxy resin composite perforated laminate, and the composite laminate bears uniaxial tension load, its structure and the direction of the tensile load such as Image 6 As shown; the diameter of the opening part is Φ18mm; the reinforcing sheet 4 is prepared from SC11-2400W glass fiber strands that are not impregnated with resin matrix, and the reinforcing sheet 4 passes through Figure 9The shown secondary curing vacuum-assisted resin injection molding process is cured on the opening part of the glass fiber / epoxy resin composite open-hole laminate to obtain the open-hole reinforced glass fiber / epoxy resin composite open-hole laminate. The specific m...

Embodiment 3

[0161] Example 3: Reinforcement experiment of fiber composite open-hole laminate by integrated curing vacuum-assisted resin injection molding process

[0162] In this embodiment, the fiber tow not impregnated with resin is used to prepare the reinforcing sheet 4, and the reinforcing sheet and the preform 3 of the fiber composite material opening are processed. Figure 10 The integrated curing vacuum-assisted resin injection molding process shown in the figure obtains the open-hole parts of the fiber composite material reinforced with open holes. The specific method includes the following steps:

[0163] Step 1. Design matching reinforcing sheet 4 according to the shape and size of the opening of the fiber composite material part;

[0164] Step 2, using the fiber tow not impregnated with the resin matrix according to the trajectory, geometry and size of the fiber tow designed in step 1, using sutures or adhesives to fix the fiber tow to obtain the required reinforcing sheet 4;...

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Abstract

The invention discloses a reinforcing sheet design and a reinforcing method for a fiber composite material opening workpiece. A matched reinforcing sheet is designed in accordance with the shape and the size of the opening portion of the workpiece. The fiber trajectory of the reinforcing sheet consists of a radial trajectory layer and an annular fiber trajectory layer, presoaked or unsoaked fiber bundles are used for preparing the reinforcing sheet in accordance with the designed fiber trajectory, the reinforcing sheet is laid on the reinforcing portion of an opening, the reinforcing sheet is cured to the opening portion through an integral curing process or a secondary curing process, and the opening reinforcement of the fiber composite material opening workpiece is achieved. The reinforcing sheet has the advantages of being simple in design, good in reinforcing effect, free from cutting, suitable to mass production and wide in application prospects.

Description

technical field [0001] The invention relates to the technical field of fiber composite materials, in particular to a design and a reinforcement method for a reinforcement sheet at an opening part to improve the performance of a fiber composite material opening. Background technique [0002] Fiber-reinforced composite materials have a series of excellent properties such as high specific strength, high specific modulus, fatigue resistance, corrosion resistance, and strong designability, and have been widely used in aerospace, navigation, national defense, transportation, chemical machinery and other fields. However, composite laminates often need openings in practical applications due to reasons such as component connection, maintenance, and weight reduction. The openings sever the fibers, causing stress concentrations that greatly reduce the load-carrying capacity of the structure. The opening part becomes a weak link in the composite material structure that is prone to dama...

Claims

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Application Information

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IPC IPC(8): B29C70/08B29C70/34
Inventor 祝颖丹
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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