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http://dx.doi.org/10.7842/kigas.2013.17.1.19

A Study on Estimation of Infinite Fatigue Life in Cruciform Fillet Welded Joint  

Lee, Yong-Bok (Dept. of Mechanical & System Design Engineering, Hongik University)
Publication Information
Journal of the Korean Institute of Gas / v.17, no.1, 2013 , pp. 19-25 More about this Journal
Abstract
The joining methods of steel structures of gas facilities, bridges, ships etc. by welding are composed mostly of T-type or cruciform fillet welding and full penetration or partial penetration according to the uses and the shape of the structures. In this study, it was examined the characteristics of fatigue crack according to penetration depth in relation to material thickness in the cruciform fillet welded joints. From the results, it was investigated the safe design stresses within the range of infinite life. When the LOP length is long the range of infinite life is small with root failure and when the LOP length is short the range of infinite life is large with teo failure. For the specimen of material thickness, 20mm welded by 3 pass compared with 10mm, 15mm welded by 2 pass, the fatigue strength and the range of infinite life was more improved by increasing of notch toughness from formation of micro-ferrite acicular structure.
Keywords
cruciform fillet welding; safe design stress; fatigue life; penetration depth; fatigue strength; infinite life; notch toughness; acicular structure;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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