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While a long stable crack propagation phase was observed during experiments of complex welded\udcomponents, very conservative assessments of the fatigue life were achieved in the past. The difference was\udexplained by the stress gradient occurring over the plate thickness. This paper deals with numerical crack\udpropagation simulations which were performed for different geometrical variants. The variants differ related to\udglobal geometry, boundary conditions and weld shape. The analyses aim to investigate how the crack\udpropagation is altered if the structural configuration gets more complex. In conclusion, the stress gradient over\udthe plate thickness, the apparent plate thickness and the notch effect slows down the crack propagation rate if\udthe same stress value being effective for fatigue appears at the weld toe. Thereby, the load-carrying grade of the\udweld, the weld flank angle and the geometrical configuration have an impact on both the notch effect and the\udlocal stress concentration

Influence of local stress concentrations on the crack propagation in complex welded components