Engineering Mechanics

Proceedings Vol. 9 (2003)

ENGINEERING MECHANICS 2003

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

 

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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