PSI - Issue 77

Georg Veile et al. / Procedia Structural Integrity 77 (2026) 348–356

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Georg Veile et al./ Structural Integrity Procedia 00 (2026) 000–000

Here, one can observe that an increase in Δx leads so a decrease in non -conservatism in all FDP. Striking is the fact, that with a minimal increase in Δx from 0.05 mm to 0.1 mm , all prediction medians with scanned weld joint topology are more conservative, compared to idealized weld radii. However, Sd. was still increased compared to the Sd. with idealized radii . Overall, it can be stated that an increase in Δx leads to an increase in conservatism as well as a decrease in scatter. Fig. 5 supports this observation with a detailed depiction of Mdn. and Sd. of all conducted calculations. In Fig. 5 results of FEA with BM are also included. However, in [3] is was found that FEA with WM lead to results with the highest precision and lowest scatter. As can be seen in Fig. 5, prediction using BM had the highest Sd. for FDP FFS . For this reason, data generated with BM is not discussed in this work. At this point, it must be mentioned that the “runouts” from [3] were not included in the evaluation of this work.

Fig. 5 Effect of Δx on the deviation of predicted fatigue life for idealised weld radii (left) and individual scanned weld joint topologies (right). FEA assigned weld metal (WM) and base metal (BM) for additional info. Sd. and Mdn. can also be given in tabular form, for an improved discussion (Table 1 and Table 2). With the quantitative numbers of the aforementioned tables it is evident that:

• The Mdn. increased for idealized and scanned weld geometries with increasing Δx. • The Sd. of predictions using idealized radii decreased for all FDP with an increase in Δx.