PSI - Issue 53

America Califano et al. / Procedia Structural Integrity 53 (2024) 185–189 Author name / Structural Integrity Procedia 00 (2019) 000–000

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were reported in Figs. 2a and 2b, respectively. The black curve represents the crack length measured by the BFS, whereas the red squares represent the crack length data obtained through the CG. At this point, the crack-growth after pre-cracking was measured and it is shown in Fig. 3 for specimen n. 2 (black curve), n. 5 (cyan curve), LT1 (red curve), LT2 (blue curve), TL1 (magenta curve) and TL2 (green curve). The numbers of cycles to failure N f were reported in Table 2.

Fig. 2. Crack-length vs. number of cycles curves (black curve) and data obtained from the crack-gauges (red scatters) for specimens LT1 (a) and TL1 (b).

Fig. 3. Crack-growth curves for the AM and wrought specimens of 17-4 PH stainless steel.

Analysing both Fig. 3 and Table 2, it can be noticed that the two sets of specimens have almost overlapping crack-growth fatigue behaviour, regardless of the crack orientation. Comparing the behaviour of the AM and the wrought stainless steels, see Fig. 3, it can be noticed that the number of cycles to failure for the wrought specimens