Fatigue strength of hybrid VHSS-Cast steel welded plates.
conference paper
Very high strength steels (VHSS) have been made available by the steel
industry for many years. In a fatigue loaded VHSS structure absolute and relative
stress variation will be higher compared to stresses in structures made of lower grade
steels. Cast steel, also available up to yield strength of 1100 MPa, is more and more
applied in fatigue loaded bridge and offshore structures. A hybrid connection, consisting
of cast steel welded to a rolled steel member, could make the use of VHSS relatively
more efficient. If designed properly, cast steel parts could result in welded joints
with low stress concentrations, by shifting welds out of the most severe stress location.
Small scale fatigue tests on hybrid connections have been executed on a 4-point bending
setup in the Stevin II Laboratory of the Delft University of Technology. All plates
were made of cast and rolled steels with nominal yield strengths of 460, 690 and 890
MPa, V-welded with thickness 25 mm, in series with and without ceramic backing.
The fatigue strength results are evaluated by comparing S-N curves and crack growth
curves.
industry for many years. In a fatigue loaded VHSS structure absolute and relative
stress variation will be higher compared to stresses in structures made of lower grade
steels. Cast steel, also available up to yield strength of 1100 MPa, is more and more
applied in fatigue loaded bridge and offshore structures. A hybrid connection, consisting
of cast steel welded to a rolled steel member, could make the use of VHSS relatively
more efficient. If designed properly, cast steel parts could result in welded joints
with low stress concentrations, by shifting welds out of the most severe stress location.
Small scale fatigue tests on hybrid connections have been executed on a 4-point bending
setup in the Stevin II Laboratory of the Delft University of Technology. All plates
were made of cast and rolled steels with nominal yield strengths of 460, 690 and 890
MPa, V-welded with thickness 25 mm, in series with and without ceramic backing.
The fatigue strength results are evaluated by comparing S-N curves and crack growth
curves.
Topics
TNO Identifier
466966
Source title
Nordic Steel Construction Conference, Malmö, Sweden 2009
Pages
478-485
Files
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