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Method for repairing notch cracks of brittle materials

A technology of brittle materials and repair methods, applied in the field of repair of notch cracks in brittle materials, can solve the problems of material failure, shorten the service life, affect the functional integrity of materials, etc., achieve good bearing capacity, restore bearing capacity, and inhibit rapid expansion. Effect

Active Publication Date: 2019-08-09
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for repairing notch cracks in brittle materials, which is used to solve the problem of the prior art due to the brittleness of the material itself. After the crack initiation, it will expand rapidly, causing the material to fail under low load, thereby seriously affecting the material. problems of functional integrity, shortening its service life

Method used

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  • Method for repairing notch cracks of brittle materials
  • Method for repairing notch cracks of brittle materials
  • Method for repairing notch cracks of brittle materials

Examples

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Effect test

Embodiment 1

[0030] combined with Figure 1-3 As shown, a method for repairing a notch crack of a brittle material, the matrix 1 is a granular composite brittle material, and the method for repairing a groove crack thereof comprises the following steps:

[0031] The first step is surface pretreatment. Gently wipe the surface of the material with absolute ethanol to remove surface dirt and dust.

[0032] The second step is to cut the patch. Cut two identical square patches from the carbon fiber cloth coil. The size of the patch depends on the size of the material block to be repaired (9×18×80mm) and the length of the gap and crack ( 4mm and 5mm respectively). In order to completely cover the crack and ensure that the patch can share the load with the material without interface cracking, the size of the patch in this embodiment is determined to be 40mm long and 10mm wide.

[0033] The third step is to paint the primer 3, put the primer 3 resin main agent and curing agent in the container i...

Embodiment 2

[0040] A method for repairing a notch crack in a brittle material, wherein the substrate 1 is a particle-composite brittle material, and the method for repairing an opening crack in it comprises the following steps:

[0041] The first step is surface pretreatment. Gently wipe the surface of the material with absolute ethanol to remove surface dirt and dust.

[0042] The second step is to cut the patch. Cut 2 identical square patches from the carbon fiber cloth coil. The size of the patch depends on the size of the sample to be repaired 9×18×80mm and the length of the gap and crack is 4mm and 6mm respectively. . In order to completely cover the crack and ensure that the patch can share the load with the material without interface cracking, the size of the patch in this embodiment is determined to be 40mm long and 12mm wide.

[0043] The third step is to paint the primer 3, put the primer 3 resin main agent and curing agent in the container in a ratio of 1:1, stir evenly, and s...

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Abstract

The invention discloses a method for repairing notch cracks of brittle materials. The method comprises the following steps of step 1, lightly wiping the surface of the material with absolute ethyl alcohol, removing surface dirt and dust; step 2, taking two identical rectangular carbon fiber cloth patches, and the width of the carbon fiber cloth patchs is required to be larger than that of the notch crack; step 3, a primer is coated on the crack and the periphery of the crack on the substrate, and the coating area is not smaller than the area of the carbon fiber cloth patchs obtained in the step 2; step 4 : the part, which is coated with the primer, of the step 3 covers the polytetrafluoroethylene plate, the primer is bonded with the material through a hot press, meanwhile, the primer is rapidly solidified; step 5, a surface glue is coated on the basis of the step 4 to completely cover the primer, then pasting the carbon fiber cloth patchs, brushing the surface glue again on the patch,covering the PTFE plate, repeatedly rolling and removing the bubbles in the same direction by using a smooth roller, and then putting in the hot press for hot pressing; step 6, standing for 12 hours at a drying and ventilation position after the hot-pressing is completed in the step 5.

Description

technical field [0001] The invention relates to the technical field of brittle materials, in particular to a method for repairing notch cracks of brittle materials. Background technique [0002] For brittle materials, the structural discontinuity caused by notches is an important factor leading to the degradation of their mechanical properties. Under the action of external load, the stress concentration effect will appear near the notch, which will lead to the initiation of cracks. Due to the brittleness of the material itself, the crack will expand rapidly after initiation, causing the material to fail under low load, which will seriously affect the functional integrity of the material and shorten its service life. Contents of the invention [0003] The purpose of the present invention is to provide a method for repairing notch cracks in brittle materials, which is used to solve the problem of the prior art due to the brittleness of the material itself. After the crack i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/74
CPCB29C70/74
Inventor 王胜男刘洋洋冯志强唐明峰温茂萍
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS