A processing method for connection holes of carbon fiber composite material plates

A composite material plate and processing method technology, which is applied in the field of carbon fiber composite parts connection, can solve the problems of not considering the material characteristics of carbon fiber composite materials, failure of connection holes, affecting connection strength and connection reliability, etc., so as to facilitate the design The effect of developing, prolonging service life, reducing the risk of cracking or delamination failure

Active Publication Date: 2019-12-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the cutting of carbon fiber filaments in the carbon fiber composite material plate is inevitable in the process of hole making, the cut fiber filaments around the hole will cause local fracture, delamination and other failures during the service process of the connecting hole, resulting in the ratio of the hole circumference to the base material. Pre-occurrence of connection failure in the unconnected area, which affects the connection strength and connection reliability
[0004] It is precisely because the existing carbon fiber composite material plate hole making method does not take into account the material properties of carbon fiber composite materials, and there is no special treatment after hole making, so the problem that the connection hole fails before the base material often occurs

Method used

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  • A processing method for connection holes of carbon fiber composite material plates
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  • A processing method for connection holes of carbon fiber composite material plates

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Embodiment 1

[0037] A method for processing a connecting hole of a carbon fiber composite material plate, comprising the following steps:

[0038] 1) According to the mechanical connection design requirements of the carbon fiber composite material plate, the numerical calculation method is used to predict the connection strength of the carbon fiber composite material plate, and the deformation of the connection hole is calculated to obtain the basic diameter of the connection hole and the deformation in the depth direction of the hole , so that the inner wall of the connection hole matches the side of the fastener (bolt);

[0039] 2) Boring is used to process the connection hole according to the basic diameter of the connection hole and the deformation in the depth direction of the hole;

[0040] 3) Structural adhesive (epoxy resin structural adhesive) is applied around the connection hole and cured at room temperature. The shear strength of the structural adhesive after curing is greater ...

Embodiment 2

[0045] A method for processing a connecting hole of a carbon fiber composite material plate, comprising the following steps:

[0046] 1) According to the mechanical connection design requirements of the carbon fiber composite material plate, the numerical calculation method is used to predict the connection strength of the carbon fiber composite material plate, and the deformation of the connection hole is calculated to obtain the basic diameter of the connection hole and the deformation in the depth direction of the hole , so that the inner wall of the connecting hole fits the side of the fastener (rivet);

[0047] 2) The connection hole is machined according to the basic diameter of the connection hole and the deformation in the depth direction of the hole by milling the hole;

[0048] 3) Structural adhesive (polyurethane structural adhesive) is applied around the connection hole and cured at room temperature. The shear strength of the structural adhesive after curing is ≥ t...

Embodiment 3

[0050] A method for processing a connecting hole of a carbon fiber composite material plate, comprising the following steps:

[0051] 1) According to the mechanical connection design requirements of the carbon fiber composite material plate, the numerical calculation method is used to predict the connection strength of the carbon fiber composite material plate, and the deformation of the connection hole is calculated to obtain the basic diameter of the connection hole and the deformation in the depth direction of the hole , so that the inner wall of the connection hole matches the side of the fastener (bolt);

[0052] 2) The connection hole is processed according to the basic diameter of the connection hole and the deformation in the depth direction of the hole by drilling;

[0053] 3) Structural adhesive (acrylic structural adhesive) is applied around the connecting hole and cured at room temperature. The shear strength of the structural adhesive after curing is greater than ...

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Abstract

The invention relates to a machining method of carbon-fiber composite material plate connecting holes. The machining method comprises the following steps that 1, the basic diameter of the connecting holes and the deformation amount in the hole depth direction are calculated; 2, the connecting holes are machined according to the basic diameter of the connecting holes and the deformation amount in the hole depth direction; and 3, a structural adhesive is coated on the periphery of each connecting hole and cured at room temperature. Compared with the prior art, the connection holes obtained through the machining method greatly improves the connection strength under the premise of meeting the relevant technical requirements, reduces the stress concentration in the peripheral area of the connection holes, reduces the risk of cracking or layering failure of the carbon-fiber composite material in the area and delays the time for hole peripheral layering failure, so that the connection strength of the carbon-fiber composite material parts with the connecting holes is improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of connecting carbon fiber composite material components, and relates to a processing method for connecting holes of a carbon fiber composite material plate. Background technique [0002] Carbon fiber composite material (referred to as CFRP) has the advantages of light weight, high strength, and good crush energy absorption characteristics. It is widely used in the automotive field and is one of the commonly used materials for lightweight vehicles. In recent years, more and more cars use carbon fiber composite materials as the main material. [0003] At present, the cost of carbon fiber composite materials is much higher than that of metal materials such as steel plates, aluminum alloys and magnesium alloys. From the perspective of mechanical properties, lightweight effects and costs, the mixed use of carbon fiber composite materials and metal materials will be the main trend of automotive materials . Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D28/26B29C35/02
CPCB21D28/26B29C35/02
Inventor 余海燕李佳旭
Owner TONGJI UNIV
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