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Effect of residual stresses on the fatigue behaviour of welded joints depending on loading conditions and weld geometry

: Sonsino, C.M.


Susmel, L.:
Fatigue assessment of welded connections : A special symposium on "Fatigue Assessment of Welded Structures" was organized in the ambit of the 6th International Conference on Fracture and Damage Mechanics, FDM 2007, which was held in Madeira, Portugal, from the 17th till the 19th of July 2007
Amsterdam: Elsevier, 2009 (International journal of fatigue 31.2009, Nr.1)
ISSN: 0142-1123
Symposium on "Fatigue Assessment of Welded Structures" <2007, Madeira>
International Conference on Fracture and Damage Mechanics (FDM) <6, 2007, Madeira>
Conference Paper, Journal Article
Fraunhofer LBF ()
steel; aluminium; loading spectrum; overload; Schweißnahtform; weld form; Beanspruchung; loading; Eigenspannung; residual stress

The structural durability of welded structures is determined by the interaction of different influencing parameters such as loading mode, spectrum shape, residual stresses and weld geometry among others. Examples from plant, offshore, transportation and automotive engineering show how these parameters influence the fatigue life and to what extent they are considered in design codes. Especially, under spectrum loading, the stress decreasing effect of tensile residual stresses is not as high as under constant amplitude loading; this knowledge benefits light weight design. The overloads harmed only the low strength joints under pulsating bending. In all other cases investigated, with low, medium and high-strength steels, a significant decrease of fatigue life was not observed; on the contrary, significant improvement of fatigue life could even be observed. However, a systematic interaction with material strength, loading mode and residual stresses was not apparent.