Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 4 Cited by
  • 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 reducing the stress concentration of the brittle material opening structure, which is used to solve the brittle characteristics of the material itself in the prior art. After the crack initiation, it will expand rapidly, causing the structure to fail under low load, thus seriously Problems affecting its functional integrity and shortening its useful life

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Embodiment 1

[0028] combined with figure 1 As shown, a method for reducing the stress concentration of the brittle particle composite opening structure and its structure, because the position of the opening has many possibilities, the opening of this embodiment is an edge opening and the cross section of the opening is Semicircle, the specific steps are as follows:

[0029] Step 1: Surface pretreatment, gently wipe the surface of the hole with absolute ethanol to remove surface dirt and dust;

[0030] Step 2: Prepare the conformal patch 2, apply top glue on the PTFE board, spread the cut carbon fiber cloth on the PTFE board, paint the top glue on the surface of the carbon fiber cloth again and cover it with the PTFE board. Then put the mounted carbon fiber cloth together with the upper and lower two PTFE boards into a vacuum bag, draw the vacuum and let it stand until the surface glue is solidified. The vacuum degree of the drawn vacuum is -80kPa. Cut a square patch with a side length of...

Embodiment 2

[0041] On the basis of Example 1, if the arc length of the cross-section of the opening is larger than a semicircle, two patches should be removed from the carbon fiber plate, and then the hole should be opened to obtain a conformal patch 2, which should be pasted according to the opening. Trimming; if the arc length of the cross-section of the opening is less than a semicircle, only one patch needs to be taken, and then the patch is cut into two identical conformal patches matching the opening.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Elastic modulusaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com