Engineering Mechanics

International Conference

Proceedings Vol. 9 (2003)


May 11 – 15, 2003, Svratka, Czech Republic
Editors: Jiří Náprstek and Cyril Fischer

Copyright © 2003 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

ISBN 80-86246-18-3 (printed, Extended Abstracts)
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)

list of papers scientific commitee

Fatigue analysis of defects in pipe welds from view of position and geometry
Němec J., Šperl M.
pages 218 - +9p., full text

Cyclic tests with the maximum force in a cycle Fmax = 5,5 kN and the cycle asymmetry ratio R = F min / F max = 0, 1 were carried out on fiat specimens of 5mm in thickness. The specimens were cut out from a weldment of X52 steel sheet ~ 1Omm thick perpendicularly to the weld seam. The results showed that the cyclic strength of a welded joint is strongly dependent not only on the depth of a defect but also on its position. The effect of the weld root appeared to be much more unfavourable than the effect of the weld cap. For blunt cracks of the same depth the life of specimens with cracks in the weld root was shorter by an order than that of specimens with cracks in the weld cap. It is therefore very important in welding to pay an increased attention to mainly the root of the weld.

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All papers were reviewed by members of the scientific committee.

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