PSI - Issue 38

Hendrik Bissing et al. / Procedia Structural Integrity 38 (2022) 372–381 Hendrik Bissing, Markus Knobloch, Marion Rauch / Structural Integrity Procedia 00 (2021) 000 – 000

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cycles. If the SN 90,WE curve is compared to the results of the Monte-Carlo simulation, the slopes of both SN 90,WE branches seem to be steeper than what the computation suggests. The three material domains BM, HAZ and WM exhibit just slight differences in the crack propagating governed range beyond 250 N/mm², which results from a small number of cycles for crack initiation. Below this value, the design with DC 90 tends to be more conservative for the WM than for the BM or the HAZ, because the black points (WM) are shifted to the right, compared with the green (BM) and red (HAZ) points, which are closer to the SN 90,WE curve. Since the WM must be chosen with a higher or at least an equal quality of the base material, the more progressive results appear realistic.

a) Numerical data from Monte-Carlo simulation distinguished for both submodels N i and N p , superimposed with the SN 90,WE curve and fatigue tests from literature (Oliver et al., 1979, Sonsino et al., 2005, Schaumann et al., 2013)

b) Numerical data from Monte-Carlo simulation for the TSM N f , superimposed with the SN 90,WE curve and fatigue tests from literature

Fig. 6. Integration of the numerical results of the TSM into data from literature