Method for testing boundary strength between fiber bundle and substrate of carbon fiber reinforced carbon materials

A technology of interface strength and carbon-carbon composite material, applied in the field of detection, can solve the problems of the strength and shape of easily damaged fiber bundles, difficulty in sample preparation, etc., and achieve the effect of strong operability and simple sample preparation process.

Inactive Publication Date: 2009-07-08
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention aims to solve the problems that the strength and shape of fiber bundles are easily damaged and the sample preparation is difficult in the existing method for detecting the strength of the interface between the fiber bundle and t...

Method used

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  • Method for testing boundary strength between fiber bundle and substrate of carbon fiber reinforced carbon materials
  • Method for testing boundary strength between fiber bundle and substrate of carbon fiber reinforced carbon materials
  • Method for testing boundary strength between fiber bundle and substrate of carbon fiber reinforced carbon materials

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Embodiment Construction

[0012] see figure 1 , this embodiment consists of the following steps:

[0013] Step A, intercept the sample thickness 2.8 ~ 3.2mm perpendicular to the axial direction of the fiber bundle to be tested, and use metallographic sandpaper of 300#, 500#, 800#, 1500#, and 2000# meshes to thin it evenly step by step, keeping The thickness of the sample is uniform, reaching a thickness of 2.30-2.40mm, and it is polished, and the polishing agent is used with a particle size of less than 5×10 -3 mm of corundum or chromium trioxide, the sample has been polished for a few minutes, and the surface of the sample is wiped with alcohol cotton to remove the polishing dirt. The interface between the fiber bundle and the matrix is ​​complete and smooth, and the interface between the fiber bundle and the edge of the fiber bundle can be clearly seen , to obtain the carbon-carbon composite material sample 8 to be tested;

[0014] Step B, fix the support slit 9 on the horizontal displacement sampl...

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Abstract

The invention discloses a method for testing boundary strength between a fiber bundle and a matrix of a carbon fiber reinforced carbon material, relates to a method for testing boundary strength between a fiber bundle and a matrix of a carbon fiber reinforced carbon matrix composite material, and solves the problems that the prior testing method is easy to damage the form of the fiber bundle and is difficult to manufacture a sample. The method comprises the following steps: thinning and polishing an intercepted carbon-carbon composite material sample; fixing the sample on a horizontal displacement sample table; applying axial pressure to the fiber bundle to be tested, and recording the relation between jacked load and displacement of the fiber bundle and a maximum jacked force value of the fiber bundle to be tested during separation of the fiber bundle from the matrix; and obtaining a shear strength value of the boundary between the fiber bundle and the matrix, and an average value of the shear strengths, a standard deviation and a dispersion coefficient of the boundary between n jacked fiber bundles and the matrix of the tested sample through the maximum jacked force value of the fiber bundle to be tested and the lateral area of the fiber bundle. The method can overall evaluate the performance of the carbon-carbon composite material.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a method for testing the interface strength between a fiber bundle and a matrix of a carbon fiber reinforced carbon material. Background technique [0002] Fiber-reinforced carbon matrix (carbon-carbon) composite material is a special composition of carbon elements with carbon fiber as reinforcement, carbonaceous material as matrix, and a single basic chemical composition. The functional composite material composed of four-part microstructure of pores and cracks has excellent properties such as high temperature resistance, low density, high specific modulus, high specific strength, thermal shock resistance, corrosion resistance, good friction performance, and small thermal expansion coefficient. At present, carbon-carbon composite materials are widely used in aerospace, nuclear energy, national defense, and many civil industries as structural materials such as frict...

Claims

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Application Information

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IPC IPC(8): G01N3/14
Inventor 黄玉东景介辉刘丽宋元军
Owner HARBIN INST OF TECH
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