Issue 78

F. Veschi et alii, Fracture and Structural Integrity, 78 (2026) 44-73; DOI: 10.3221/IGF-ESIS.78.04

Fig. 6 provides a schematic classification of the previously described approaches, highlighting their similarities and differences.

Figure 5: Comparison between Equivalent PSDs.

Figure 6: Graphic summary of the SoR fatigue assessment methods.

N UMERICAL COMPARISON

his section presents a comparative numerical validation of the SoR fatigue assessment approaches previously introduced. The objective is twofold: to quantify their predictive accuracy and to map their operational limits based on the spectral characteristics of the excitation. The time-domain damage calculation – utilizing synthetic time histories, rainflow counting, and the Palmgren-Miner rule – serves as the exact benchmark. Despite its high computational cost, the RFC approach is adopted as the baseline because it avoids the statistical approximations inherent in spectral methods. T

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