The Paton Welding Journal, 2012, №09



2012 №09 (03)

2012 №09 (05)

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The Paton Welding Journal, 2012, #9, 26-29 pages  

SUBSTANTIATION OF «LEAK-BEFORE-BREAK» CRITERION FOR VERTICAL CYLINDRICAL TANKS FOR OIL STORAGE

V.V. Knysh, A.Yu. Barvinko, Yu.P. Barvinko and A.N. Yashnik

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
The paper gives the results of experimental studies of cyclic crack resistance of samples of butt-welded joints on 06GB-390 steel in the case of oil storage tanks at stable development of a through-thickness fatigue crack, initiating from the notch surface along the fusion line, from the moment of its initiation up to reaching the length of about 30 mm. Large-scale samples of welded joints of 650 x 160 x 20 mm dimensions were tested at harmonic alternating zero-to-tension stress cycle with s_max = 2/3s_y. It is shown that application of rolled sheets of the above-mentioned steel for design rings of tank wall allows, at application of «leak-before-break» criterion, eliminating extended fractures in the wall welded joints.
 
 
Keywords: fatigue crack, development of through-thickness fatigue crack, «leak-before-break» criterion, cyclic loading
 
 
Received:                06.04.12
Published:               28.09.12
 
 
References
 
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