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Judgment Method of Failure Mode of Carbon Nanotubes in Composite Materials Considering Size Parameters

A carbon nanotube and failure mode technology, which is applied in the field of judgment of the failure mode of carbon nanotubes in composite materials, can solve the problems of increasing the toughness of the matrix, increasing the deformation ability of the matrix, and not being able to effectively improve the deformation ability of the matrix

Active Publication Date: 2021-11-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It can be seen that when the failure mode of carbon nanotubes is pull-out failure, the relative displacement between them and the matrix can increase the deformation capacity of the matrix, and the frictional work can also consume the energy of the external load and increase the toughness of the matrix; Due to the pull-out failure, the tensile failure is more sudden, and there is almost no relative displacement between the fiber and the matrix, so the deformation capacity of the matrix cannot be effectively improved.

Method used

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  • Judgment Method of Failure Mode of Carbon Nanotubes in Composite Materials Considering Size Parameters
  • Judgment Method of Failure Mode of Carbon Nanotubes in Composite Materials Considering Size Parameters
  • Judgment Method of Failure Mode of Carbon Nanotubes in Composite Materials Considering Size Parameters

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: Prediction of the failure mode of a multi-walled carbon nanotube.

[0040] The multi-walled carbon nanotube parameters are: D=25nm, d=20nm, length L=30μm, σ=50GPa, τ i =20MPa, then there are λ=0.8, κ=0.4×10 -3 .

[0041] Substituting λ=0.8 into formula (5), by changing the diameter D, and using formula (5) to calculate the different corresponding critical values ​​of length L, the graph shows the relationship between the damage mode of carbon nanotubes and geometric parameters, as shown in Figure 6(a ).

[0042] Substituting the point (30, 25) corresponding to the carbon nanotube into Figure 6(a), it is found that the point is below the relationship line, and it is predicted that the carbon nanotube will be broken. The carbon nanotube was observed and verified with an electron microscope, as shown in Figure 6(b), it was found that the fracture of the carbon nanotube had obvious damage marks, indicating that it was indeed broken, and the judgment method pro...

Embodiment 2

[0043] Example 2: Prediction of the failure mode of a multi-walled carbon nanotube.

[0044] The multi-walled carbon nanotube parameters are: D=30nm, d=20nm, length L=60μm, σ=50GPa, τ i =20MPa, then there are λ=0.67, κ=0.4×10 -3 .

[0045] Substituting D=30nm into formula (5), by changing the inner and outer diameter ratio λ, and using formula (5) to calculate the different corresponding critical values ​​of the length L, and drawing to show the relationship between the carbon nanotube damage mode and the geometric parameters, as shown in Figure 7 (a).

[0046]Substituting the point (0.67, 60) corresponding to the carbon nanotube into Figure 7(a), it is found that this point is above the relationship line, and it is predicted that the carbon nanotube will be fractured. The carbon nanotube was observed and verified with an electron microscope, as shown in Figure 7(b), it was found that the fracture of the carbon nanotube had obvious damage marks, indicating that it was indee...

Embodiment 3

[0047] Example 3: Prediction of the failure mode of a multi-walled carbon nanotube.

[0048] The multi-walled carbon nanotube parameters are: D=50nm, d=15nm, length L=30μm, σ=50GPa, τ i =20MPa, then there are λ=0.3, κ=0.4×10 -3 .

[0049] Substituting L=30 μm into formula (5), by changing the diameter D, and using formula (5) to calculate different corresponding critical values ​​of inner and outer diameter ratio λ, and drawing to show the relationship between carbon nanotube damage mode and geometric parameters, as shown in Figure 8 (a).

[0050] Substituting the point (0.3, 50) corresponding to the carbon nanotube into Fig. 8(a) for identification, it is found that this point is above the relationship line, and it is predicted that the carbon nanotube will be pulled out and damaged. The carbon nanotubes were observed and verified with an electron microscope, as shown in Figure 8(b), it was found that the ends of the carbon nanotubes were complete and smooth without fractu...

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Abstract

The invention discloses a method for judging the failure mode of carbon nanotubes in composite materials considering size parameters. In the present invention, for the three dimensional variables of carbon nanotube diameter, length, and the ratio of inner and outer diameters, the three variables are respectively taken as fixed values, and the basic mechanical properties of carbon nanotubes and composite materials are substituted into the formula, and the coordinate diagram is drawn to obtain the other two The critical size curve of a variable, when judging, the specific size parameters of carbon nanotubes are substituted into the coordinate diagram, and according to the relative positional relationship between the size parameters of carbon nanotubes and the critical size curve, the failure mode of carbon nanotubes in composite materials can be determined. It can be used to guide experiments and engineering practice.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for judging the damage mode of carbon nanotubes in composite materials considering size parameters. Background technique [0002] Carbon nanotube (CNT) is an ideal reinforcement material, which has received extensive attention and application in the field of composite materials in recent years. In fiber-reinforced composites, as a reinforcing and toughening material, the failure modes of carbon nanotubes are mainly pulling out and breaking. The fibers at the crack are anchored in the matrix on both sides of the crack, playing a bridging role and preventing the crack from expanding. At this time, the bonding force and friction force between the fiber and the matrix resist the pull-out force of the carbon nanotubes. As the external load increases, the cracks further expand, and the pull-out force on the fiber also increases. When the pull-out force is greater than the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14
Inventor 徐世烺李庆华王晓冉
Owner ZHEJIANG UNIV