ABSTRACT

Residual stresses are suspected to affect fatigue strength of welded joints under cyclic loading. For the assessment of the influence of residual stresses, the residual stress states must be known. Whereas surface residual stresses can be determined by means of X-ray diffraction, the stress distribution over specimen depth can be determined by neutron diffraction. Here the presented residual stresses were determined from a mild steel S355NL and a quenched and tempered high-strength steel S960QL. The stresses were measured from welded steel plates with longitudinal stiffeners attached at both sides. Since not only initial residual stresses are of interest but also the relaxation of those under mechanical loading, stresses were also determined after quasi-static loading. The objective of this paper is to present welding-induced residual stresses of longitudinal stiffeners in order to have a reliable reference for the evaluation of residual stress effects on fatigue strength. This work focuses on own measurements by X-ray and neutron diffraction. Further these results are compared to residual stress measurements from earlier investigations.

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