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Spectrum fatigue of high strength steel joints welded with low temperature transformation consumables
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0003-4180-4710
2007 (English)In: 2nd International Conference on Fatigue Design, 2007Conference paper (Refereed)
Abstract [en]

In the present paper constant (CA) and variable amplitude (VA) fatigue testing have been carried out on out-ofplane gusset fillet welded high strength steel joints. The joints were welded with conventional weld fillermaterial and martensitic low transformation temperature weld filler, LTT, in order to study the influence of theresidual stress on the fatigue strength. Residual stress measurements were carried out close to the weld toe usingX-ray diffraction technique in order to study the relaxation due to VA fatigue. The residual stress showeddifferent level of relaxation depending on the VA spectrum loading used. The LTT joints shows ~40% increasein mean fatigue strength compared to the conventional joints in CA. The LTT joints shows ~12% increase inmean fatigue strength compared to the conventional joints. The LTT joints shows 33% increase in mean fatiguestrength in CA compared to VA testing. However, the improvement of the fatigue strength is less significant invariable amplitude testing mainly due to the relaxation of the compressive residual stresses.

Place, publisher, year, edition, pages
Keyword [en]
Residual stress, stress relaxation, welded joints, fatigue testing, weld filler, LTT, high strength steel
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-61538OAI: diva2:479329
2nd International Conference on Fatigue Design. Senlis, France. November 21-22, 2007
QC 20120524Available from: 2012-01-17 Created: 2012-01-17 Last updated: 2012-05-24Bibliographically approved

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