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
CN103077320BActive Publication Date: 2016-08-03DALIAN JIAOTONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN JIAOTONG UNIVERSITY
Publication Date
2016-08-03

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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.
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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

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