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Residual Stress Relaxation of Quasi-Statically and Cyclically-Loaded Steel Welds

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Abstract

Weld fatigue strength is currently the bottleneck to designing high performance and lightweight welded structures using advanced materials. In addition to loading conditions, environmental aspects, geometrical features and defects, it has been proven that studying the influence of residual stresses on fatigue performance is indispensible. The extent of the influence is, however, a matter of discussion. In this work, residual stress behaviour in welded S355J2G3 and S1100QL steel specimens under quasi-static and cyclic loading were studied and the correlation between the relaxation of residual stress field and mechanical properties was studied. Residual stress measurements were performed using the X-ray diffraction technique. The relaxation behaviour in S355J2G3 at weld metal, weld toe and in the base metal could be described by Von Mises criteria. This was not the case for S1100QL. In the case of relaxation, it was observed that if the Von Mises stress, as a function of residual, load and mean stresses, exceeds the monotonic yield strength of the base metal, relaxation takes place. Otherwise, the internal elastic stresses remain stable regardless of the number of loading cycles and could contribute to fatigue damage.

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Authors and Affiliations

  1. Institute of Joining and Welding, University of Braunschweig, Braunschweig, Germany

    Majid Farajian-Sohi M.Sc.,  Thomas Nitschke-Pagel &  Klaus Dilger

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  1. Majid Farajian-Sohi M.Sc.
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  2. Thomas Nitschke-Pagel
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  3. Klaus Dilger
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Correspondence to Majid Farajian-Sohi M.Sc., Thomas Nitschke-Pagel or Klaus Dilger.

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Farajian-Sohi, M., Nitschke-Pagel, T. & Dilger, K. Residual Stress Relaxation of Quasi-Statically and Cyclically-Loaded Steel Welds. Weld World 54, R49–R60 (2010). https://doi.org/10.1007/BF03263484

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