The fatigue strength of base material and butt welds made of S690 and S1100
conference paper
Modern steel manufacturing techniques make it possible to produce steel with nominal strengths up to 1100 MPa (very high strength steels, VHSS). For the design of cyclic loaded slender VHSS structures, the fatigue strength of both base material and welded components should be known. In a VHSS fatigue loaded structure absolute and relative stress variation will be higher compared to structures made of conventional steel. According to EN1993-1-9 (2005), applicable to steels with yield strengths up to 690 MPa, fatigue strength of welded connections mainly depends on the applied detail, plate thickness and machining condition, not on yield strength. Literature results on base materials however show higher fatigue strength by increased yield strength. If the use of VHSS would be beneficial increasing the fatigue strength of a welded joint as well, than most likely this increase would be shown in a high quality butt weld, having lower stress concentration compared to other welded details, like a fillet weld. Laboratory tests have been performed in order to study the fatigue strength of base materials and as welded butt weld joints made of S690 and S1100. Both VHSS base material and transverse butt weld characteristic fatigue strength lays well above the values according to EN1993-1-9 (2005), mainly because of higher slope in S-N curves.
TNO Identifier
466967
ISBN
978-0-415-45141-3
Publisher
Taylor and Francis
Source title
5th International Conference on Advances in Steel Structures, Singapore, 5-7 December 2007
Editor(s)
Wang, Y.C.
Choi, C.K.
Choi, C.K.
Collation
7 p.
Place of publication
London
Pages
901-907
Files
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