Method for reducing stress concentration of perforated structure of brittle material

A brittle material and stress concentration technology, applied in the field of brittle materials, can solve problems affecting functional integrity, structural failure, shortened service life, etc., and achieve the effects of improving overall bearing capacity, reducing stress concentration, and improving bonding strength

Pending Publication Date: 2019-11-12
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for reducing the stress concentration of the brittle material opening structure, which is used to solve the brittle characteristics of the material

Method used

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  • Method for reducing stress concentration of perforated structure of brittle material
  • Method for reducing stress concentration of perforated structure of brittle material
  • Method for reducing stress concentration of perforated structure of brittle material

Examples

Experimental program
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Example Embodiment

[0027] Example 1:

[0028] combined with figure 1 As shown in the figure, a method and structure for reducing stress concentration in the opening structure of brittle particle composite materials, because the positions of the openings are possible, the openings in this embodiment are edge openings and the cross-section of the openings is Semicircle, the specific steps are as follows:

[0029] The first step: surface pretreatment, gently wipe the surface of the opening part with anhydrous ethanol to remove surface dirt and dust;

[0030] Step 2: Preparation of the conformal patch 2, brush the surface glue on the PTFE plate, lay the cut carbon fiber cloth on the PTFE plate, brush the surface glue again on the surface of the carbon fiber cloth and cover it with the PTFE plate. Subsequently, put the mounted carbon fiber cloth together with the upper and lower two PTFE sheets into a vacuum bag, and after vacuum extraction, leave it to stand until the surface glue is cured, and th...

Example Embodiment

[0040] Example 2

[0041] On the basis of Example 1, if the arc length of the cross-section of the opening is greater than the semicircle, two patches should be removed from the carbon fiber board, and then the conformal patch 2 should be obtained by opening the hole. Trimming; if the cross-sectional arc length of the opening is less than a semicircle, only one patch needs to be taken, and the patch is trimmed into two identical conformal patches 2 that match the opening.

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Abstract

The invention discloses a method for reducing the stress concentration of a perforated structure of a brittle material, and is applied to the technical field of brittle materials. The method comprisesthe following steps that firstly, surface pretreatment is carried out on a perforated part by adopting a mode of locally pasting a high-strength conformal patch, then a primer is brushed, then the prepared conformal patch is pasted on the periphery of the perforated structure, the surface and the edges of the patch are brushed with finishing glue, and finally, the patch is placed in a vacuum environment for curing.

Description

technical field [0001] The invention relates to the technical field of brittle materials, in particular to a method for reducing the stress concentration of the opening structure of brittle materials. Background technique [0002] In order to meet some specific functional requirements, brittle materials are often designed with some open-pore structures. Under the action of external load, the open structure is prone to stress concentration effect, which leads to the initiation of cracks. Due to the brittleness of the material itself, the crack will expand rapidly after initiation, causing the structure to fail under low load, which will seriously affect its functional integrity and shorten its service life. Therefore, reducing the stress concentration of the open-pore structure and improving its load-carrying capacity are of great significance for maintaining the structural and functional integrity of brittle materials. Contents of the invention [0003] The purpose of th...

Claims

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Application Information

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IPC IPC(8): B29C65/48B29C70/34
CPCB29C65/48B29C66/43B29C70/342
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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