Untersuchungen zum Ermüdungsverhalten von hochfesten Stählen im Rahmen von LIFTHIGH

Puthli, Ram; Herion, Stefan; Bergers, Jennifer

doi:10.1002/stab.200610101

Cited by 9 publications

(2 citation statements)

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“…In practice however machining critical details is time consuming, especially for large structures. The German steel journal Stahlbau pays special attention to research on high strength steel in [7,8,9]. A research project relating to the fatigue classification of high strength steel is the project 'Efficient Lifting Equipment with Extra High Strength Steel' (LIFTHIGH), initiated by the ECSC [8].…”

Section: Literature Reviewmentioning

confidence: 99%

Fatigue Experiments on Very High Strength Steel Base Material and Transverse Butt Welds

Pijpers

Kolstein²,

Romeijn³

et al. 2009

Volume 5 Number 1

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Very High Strength Steels (VHSS) with nominal strengths up to 1100 MPa have been available on the market for many years. However, the use of these steels in the civil engineering industry is still uncommon, due to lack of design and fabrication knowledge and therefore limited inclusion in codes. Moreover, in a fatigue loaded VHSS structure absolute and relative stress variation will be higher compared to stresses in structures made of lower grade steels. According to current design codes the fatigue strength of welded connections mainly depends on the applied detail, plate thickness and machining condition, not on steel grade. Recently experiments on plates made of S690 and S1100, with and without transverse butt welds, have been performed in order to study the fatigue strength. Test results show that the characteristic fatigue strengths of plates with and without transverse butt weld lay well above the values according to EN 1993-1-9, mainly because of higher slope of the S-N curves. Crack initiation phase of S1100 specimens is relatively long compared to S690 specimens, while crack propagation is relatively short. An efficient application of VHSS in welded connections requires high fabrication quality and avoidance of large stress concentration in joints.

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Section: Literature Reviewmentioning

confidence: 99%

Fatigue Experiments on Very High Strength Steel Base Material and Transverse Butt Welds

Pijpers

Kolstein²,

Romeijn³

et al. 2009

Volume 5 Number 1

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“…In addition, it was found that reduction of the notch factor, which was achieved by machining welds, gives an advantage for very high strength steels. Puthli et al (2006), performed fatigue tests on various butt welded plate specimens with a thickness of 6-8 mm made of S690, S960 and S1100 in the framework of a research program of ECSC. The characteristic fatigue strength of all steel grades was found to be above the recommended values of EN 1993EN -1-9 (2006.…”

Section: Introductionmentioning

confidence: 99%

Fatigue strength of repaired welded connections made of very high strength steels

Akyel

Kolstein

Bijlaard

2018

Engineering Structures

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Modern steel manufacturing techniques make it possible to produce steel with the nominal yield strength up to 1300 MPa for structural purposes. However, the application of very high strength steels is still limited in the civil engineering structures due to lack of knowledge about the effects of the manufacturing process and experimental results regarding the structural behaviour of the material. Moreover, in a fatigue loaded very high strength steel structure absolute and relative stress variations will be higher compared to stresses in structures made of lower steel grades. Accordingly, the fatigue issue will be one of the most important design criteria for very high strength steel structures. In this current study, V-shape welded specimens were manufactured from S690 and S890 rolled steels and cast steels with similar yield strengths. Fatigue cracks were created in the weld toe of the specimen under a fluctuated loading and subsequently the fatigue damaged specimens were repaired by the removal of the cracks with subsequent welding. The fatigue strength curves of repaired specimens are compared with the detail categories of EN 1993-1-9 (2006) and the fatigue strength curves of the test results in the aswelded condition from literature. The fatigue strength of the fatigue damaged connections was completely recovered by the established repair procedure.

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Stahlbaunormen

Nussbaumer¹,

Günther²

2012

Stahlbau Kalender 2012

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Untersuchungen zum Ermüdungsverhalten von hochfesten Stählen im Rahmen von LIFTHIGH

Cited by 9 publications

References 1 publication

Fatigue Experiments on Very High Strength Steel Base Material and Transverse Butt Welds

Fatigue Experiments on Very High Strength Steel Base Material and Transverse Butt Welds

Fatigue strength of repaired welded connections made of very high strength steels

Stahlbaunormen

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