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A method for repairing notch cracks in brittle materials

A technology of brittle materials and repair methods, which is applied in the field of notch crack repair of brittle materials, can solve problems such as material failure, shortening service life, and affecting material functional integrity, and achieve good bearing capacity, restore bearing capacity, and inhibit rapid expansion. Effect

Active Publication Date: 2021-06-29
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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  • A method for repairing notch cracks in brittle materials
  • A method for repairing notch cracks in brittle materials
  • A method for repairing notch cracks in 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 a notch crack of a brittle material, which comprises step 1: gently wiping the surface of the material with absolute ethanol to remove surface dirt and dust; step 2: taking two identical rectangular carbon fiber cloth patches, The width of the carbon fiber cloth patch is required to be greater than the length of the notch crack; Step 3: Apply primer to the crack on the substrate and around the crack, and the area to be painted is not less than the area of ​​the carbon fiber cloth patch obtained in Step 2; Step 4: In step 3, the part where the primer is applied is covered with a polytetrafluoroethylene board, and the primer is bonded to the material through a hot press, and the primer is cured rapidly; step 5: Apply the surface glue on the basis of step 4 Cover the base glue completely, then paste the carbon fiber cloth patch and paint the surface glue on the patch again, cover the PTFE plate, roll repeatedly in the same direction with a smooth roller to remove air bubbles, and then place it in a hot press for hot pressing; step 6: After step 5 heat pressing is completed, let it stand in a dry and ventilated place for 12 hours.

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 Patents(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
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