The paper investigates the fatigue strength of laser stake‐welded T‐joints subjected to reversed bending. The fatigue tests are carried out with the load ratio, R ≈ −0.8. The experimental data is firstly analysed using the nominal stress approach and then by the J‐integral as the local fatigue strength parameter in the finite element (FE) assessment. The nominal stress approach demonstrated that the fatigue strength of the investigated T‐joints is lower than encountered for any other steel joint under reversed tensile loading. The results also showed that the fatigue strength of this joint under the load ratio R ≈ −0.8 increases with respect to R = 0 bending by 22.6% in the case of the nominal stress approach and 13% in the case of the J‐integral approach. However, the slopes of the fatigue resistance curves for different load ratios appear very similar, suggesting that the load ratio has an insignificant influence to the slope. In contrast to the similar slopes, the scatter indexes were different. The nominal stress approach shows that the scatter index is 3.4 times larger for R ≈ −0.8 than R = 0 bending. The J‐integral approach showed that the scatter index for R ≈ −0.8 is only 67% larger than in the R = 0 case because the weld geometry is modelled in the FE analysis.
Zum einen bietet das “neu” entwickelte Hohlprofil aufgrund der hohen Knotensteifigkeit vorteilhafte Trageigenschaften von Knoten mit dreieckigen Gurtquerschnitten, zum anderen eröffnet dieses Profil interessante ästhetische Aspekte auch unter ökonomischen Gesichtspunkten. Aufgrund des vielversprechenden Erfolgs des Forschungsvorhabens ist eine Vertiefung und Erweiterung der Ergebnisse für die allgemeine Anwendung von Hohlprofilknotenkonstruktionen mit THS‐Querschnitten im Rahmen eines anschließenden Forschungsprojekts vorgesehen. T‐joints with chord members made of triangular hollow sections. On one hand the newly developed hollow section provides advantageous bearing‐properties of joints with triangular shaped chord sections due to high joint‐rigidity, on the other hand it offers interesting aspects in an aesthetic as well as in an economic point of view. Because of the promising success of this research project a more detailed insight and an enhancement of the results for the general application of constructions made of hollow sections with triangular hollow sections is intended within the scope of a subsequent research project.
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