The thickness effect of welded details improved by high-frequency mechanical impact treatment
Artikel i vetenskaplig tidskrift, 2017
High-frequency mechanical impact (HFMI) treatment can enable resource-efficient structural design by
improving the fatigue strength of welded joints. While the thickness effect with reference to the fatigue
of welded details is well known and covered in design codes, this effect has not been investigated systematically
when the welds are improved by HFMI. In this study, experimental data of 582 small-scale fatigue
tests on welded details with HFMI treatment has been collected from the literature and evaluated with
respect to the thickness effect. In order to separate the effects of yield strength and thickness on the fatigue
strength, a new approach was developed to adjust the data to a reference yield strength of 355 MPa
prior to thickness evaluation. The test data covered transverse butt welds, details with non-load-carrying
transverse attachments and details with non-load-carrying longitudinal attachments. The thickness
effect of details with transverse attachments corresponds well with the IIW recommendation of
n = 0.2, whereas transverse butt welds have a much weaker thickness effect. Details with longitudinal
attachments show a ‘‘reverse” thickness effect.
HFMI
Size effect
Fatigue
Steel
Thickness effect