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

A Welding Fatigue Analysis Method Based on Rough Set Theory

A rough set theory and welding fatigue technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of reducing the accuracy of fatigue life of welded structures, lack of correlation, etc., and achieve fatigue analysis and analysis of welded structures Prediction is accurate and reliable, and the effect of reducing calculation errors

Active Publication Date: 2016-08-03
DALIAN JIAOTONG UNIVERSITY
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the main S-N curve method, the mesh-insensitive structural stress calculation solves the inconsistency in the finite element calculation of the weld stress distribution, but in the fatigue life evaluation stage based on the crack growth theory, the load form is simplified, and the material properties, The influence of welding process and other factors on fatigue life is ignored, and the above problems will reduce the accuracy of analysis and prediction of fatigue life of welded structures
The fatigue life of welded structures is affected by the coupling of various factors. The current welding fatigue analysis method is relatively independent in the analysis of the above-mentioned influencing factors, lacks the degree of correlation between them, and fails to comprehensively consider the influence of various factors.

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
  • A Welding Fatigue Analysis Method Based on Rough Set Theory
  • A Welding Fatigue Analysis Method Based on Rough Set Theory
  • A Welding Fatigue Analysis Method Based on Rough Set Theory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention:

[0049] Such as figure 1 Shown: A welding fatigue analysis method based on rough set theory, which mainly includes the following steps:

[0050] S100. Establish a fatigue database including at least basic parameters of welded joints, maximum structural stress and cycle times for multiple sets of welded joint fatigue tests:

[0051]

[0052] The basic parameters of the welded joint mainly include: material name, joint type, load type, stress ratio, weldment thickness, weld leg length, welding method, yield strength, tensile strength, bending stress ratio and other parameters. And, the load type, stress ratio, bending stress ratio and maximum structural stress ar...

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

No PUM Login to View More

Abstract

The invention discloses a welding fatigue analyzing method based on a rough set theory. The method comprises the following steps of S100, according to a plurality of sets of welded joint fatigue tests, establishing a fatigue database at least containing load attributes, maximum structural stress and number of cycle times; S200, calculating a structural stress change range delta (sigma s) for the maximum structural stress in the fatigue database; constructing attributes for the delta (sigma s) and the number of cycle times; generating decision attribute values in the rough set database, and writing into the rough set database; S300, using the welded joint basic parameters in the fatigue database as conditional attribute values in the rough set database, and writing into the rough set database; and S400, carrying out conditional attribute reduction and conditional attribute value reduction on the obtained rough set database containing the decision attribute values and the conditional attribute values by an united entropy reduction algorithm, so as to obtain a rough set decision rule model; and applying the rule model to analyze the welding fatigue data to obtain the rough set judging results, and then completing the fatigue welding analysis.

Description

technical field [0001] The invention relates to a welding fatigue analysis method, in particular to a welding fatigue analysis method based on rough set theory. Involved in the patent classification number G01N to test or analyze materials by means of determining their chemical or physical properties. Background technique [0002] Welding is an important advanced manufacturing technology, which plays a very important role in industrial production and national economic construction. The welded structure has technical advantages such as high strength, good sealing, high flexibility in structural design, simple process, and easy repair, and has been widely used in the manufacture of metal structures in many industrial sectors. The characteristics of the welding process and the geometric discontinuity of the joint make the fatigue strength far lower than that of the base metal. The existing research results show that the failure of the welded structure caused by fatigue damage ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 杨鑫华孙屹博邹丽赵慧敏
Owner DALIAN JIAOTONG UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products