2022 KB24 KB199920252014Sun, YiboYang, Xinhualetnik:60številka:9str. 600-606, SI 107ISSN:0039-2480COBISSID:13700379URN:URN:NBN:SI:doc-3567WSALenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikenakovredne napetostikorekcijametoda glavne krivulje S-Nporazdelitev podatkovteorija grobih množicutrujanje zvarovvarjenjeStudy on the correction of S-N distribution in the welding fatigue analysis method based on the battelle equivalent structural stress by rough set theory|In welding techniques, failure is a key problem that is related to the stability and safety of the welded structure. In the commonly used welding fatigue analysis methods, the Master S-N curve method based on Battelle structural stress solves the problem of inconsistencies in stress calculation and S-N curve selection better than the nominal stress method and hot spot stress method. In this paper, rough set theory was employed to study the S-N distribution based on the Battelle equivalent structural stress. Firstly, rough set analyses of the S-N distribution based on the nominal stress, structure stress and Battelle equivalent structure stress were carried out. Then the S-N distributions based on the three stresses were studied. The results indicated that structural stress rearranges the S-N point making it much more concentrated in the region near the mean S-N curve and that equivalent structural stress places the S-N point more uniformly on both sides of the curve. Subsequently, the corrections from the plate thickness and stress ratio in the Master S-N curve method were studied. It was concluded that with two steps of corrections the decision-making degrees of welding factors are weakened and harmonized in the Battelle equivalent structural stress. This made the S-N distribution much more concentrated and uniform, which allows more accurate welding fatigue prediction by the Master S-N curveOdpoved zvarov je ključni problem na področju stabilnosti in varnosti varjenih konstrukcij. Trenutno se pri analizi in napovedovanju utrujanja zvarov najpogosteje uporabljajo metoda imenskih napetosti, metoda vročih točk in metoda glavne krivulje S-N na osnovi enakovredne napetosti v konstrukciji po organizaciji Battelle. Metoda enakovredne napetosti v konstrukciji po Battelle v primerjavi s preostalima dvema metodama odpravlja težave z nedoslednostjo pri izračunavanju napetosti in izbiri krivulje S-NTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo