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Thickness-variable local reinforcement method for fiber composite material workpiece

A fiber composite material and composite material technology, which is applied in the field of local variable thickness reinforcement and reinforcement, can solve the problems of low reliability of reinforcement structure, poor reinforcement effect, and low work efficiency, and achieve weight reduction and thickness reduction. , the effect of improving work efficiency

Active Publication Date: 2013-11-20
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 technical problem to be solved by the present invention is to solve the shortcomings of existing methods of local reinforcement of fiber composite parts, such as poor reinforcement effect, low reliability of the reinforcement structure, difficult quality control, cumbersome procedures, and low work efficiency. Provide a local variable thickness reinforcement method suitable for fiber composite parts with arbitrary geometric shapes on the surface, and can ensure that the reinforcement parts have sufficient structural rigidity and structural strength

Method used

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  • Thickness-variable local reinforcement method for fiber composite material workpiece
  • Thickness-variable local reinforcement method for fiber composite material workpiece
  • Thickness-variable local reinforcement method for fiber composite material workpiece

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In this embodiment, the fiber composite material part is an open-hole carbon fiber / epoxy resin composite material laminate prepared by eight layers of Toray 12K T700 carbon fiber twill cloth. The composite material laminate bears a uniaxial tensile load, and its structure and the The direction of tensile load is as figure 1 As shown; the part to be reinforced is the opening part of the open-hole carbon fiber / epoxy resin composite laminate, and the hole diameter of the opening part is Φ16mm; the reinforcement piece 4 is made of Toray 12K T700 carbon fiber wire not impregnated with matrix resin bundle preparation, the reinforcing sheet 4 and the preform 3 of the perforated carbon fiber / epoxy resin composite laminate Figure 4 The integrated curing RTM molding process shown in the figure obtains a carbon fiber / epoxy resin composite laminate with holes reinforced with variable thickness at the holes. The specific method includes the following steps:

[0034] Step 1. Accor...

Embodiment 2

[0052] In this embodiment, the fiber composite material part 1' is an open-hole carbon fiber / epoxy resin composite laminate, and its structure is as follows Figure 5 As shown; the part to be reinforced is the opening part of the open-hole carbon fiber / epoxy resin composite laminate. The reinforcement sheet 4 is prepared from Toray 12K T700 carbon fiber tow not impregnated with matrix resin, and the reinforcement sheet 4 passes Figure 8 The secondary curing vacuum-assisted resin injection molding process shown is cured on the opening of the open-hole carbon fiber / epoxy resin composite laminate to obtain an open-hole carbon fiber / epoxy resin composite laminate with reinforcement at the opening. The specific method includes the following steps:

[0053] Step 1. According to the uniaxial tensile load of the carbon fiber / epoxy resin composite laminate, analyze the force of the opening part of the composite laminate, determine the main load direction of the opening part, and dete...

Embodiment 3

[0067] In this embodiment, the fiber tow not impregnated with resin is used to prepare the reinforcement sheet, and the reinforcement sheet and the preform of the fiber composite product are subjected to Figure 9 The integrated curing vacuum-assisted resin injection molding process shown in the figure can obtain fiber composite parts reinforced with local variable thickness. The specific method includes the following steps:

[0068] Step 1. Carry out force analysis on the part to be reinforced, determine the main load bearing direction of the part to be reinforced, and determine the geometric shape, size and thickness of each position of the part to be reinforced, and then design the reinforcement sheet 4, Make the fiber tow trajectory of the reinforcing sheet 4 consistent with the force bearing direction of the part to be reinforced, and match the geometry, size and thickness of each position with the part to be reinforced;

[0069] Step 2, using fiber tows that are not inf...

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Abstract

The invention discloses a thickness-variable local reinforcement method for a fiber composite material workpiece. The method comprises designing a matching reinforcement panel according to the main load supporting direction, the geometrical shape, the dimension and the actual thickness at each position of a part to be reinforced; preparing the reinforcement panel from fiber bundles pre-soaked or not soaked into resin in such a manner that the track of the fiber bundles of the reinforcement panel is consistent with the force bearing direction of the part to be reinforced; laying the reinforcement panel onto the part to be reinforced; and curing the reinforcement panel on the part to be reinforced by integrated curing formation technology or secondary curing formation technology to realize local reinforcement of the fiber composite material workpiece. In comparison with the prior art, the method provided by the invention can realize local reinforcement of the fiber composite material workpiece with random geometrical shape, thickness distribution and fiber orientation, and can ensure enough structural rigidity and strength of the reinforced part; and the method has the advantages of simple and convenient operation and excellent reinforcement effect.

Description

technical field [0001] The invention relates to the technical field of fiber composite materials, in particular to a method for locally variable thickness reinforcement of fiber composite material parts. Background technique [0002] Fiber composite materials have the characteristics of light weight, high specific strength, high specific stiffness, excellent vibration damping performance, good fatigue resistance, corrosion resistance, etc., and are widely used in aerospace, navigation, national defense, transportation, civil engineering, energy , chemical machinery, sports entertainment and other fields. [0003] When fiber composite parts are subjected to external force during use, stress concentration will occur in the weak part. When the stress here is greater than the bearing strength limit of the material, there will be rupture and failure, which will affect the safety of the part structure. pose a serious threat, so weak local areas need to be reinforced. In addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/28
Inventor 祝颖丹
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI