PSI - Issue 57

David Mellé et al. / Procedia Structural Integrity 57 (2024) 61–72

69

David Melle´ / Structural Integrity Procedia 00 (2023) 000–000

9

Fig. 9. Populations of surface micro-geometric features ∆ K of several 30 min etched coupons identified by surface interferometry measurements. The killer feature ∆ K is enclosed in the red diamond marker. The red triangle correspond to the SEM images measurements of the killer surface feature.

Fig. 10. Populations of surface micro-geometric features SCF of several 30 min etched coupons identified by surface interferometry measurements. The killer featureSCF is enclosed in the red diamond marker. The red triangle correspond to the SEM images measurements of the killer surface feature.

fact that a ∆ K approach should be considered. The question is then: Why do some surface features have a higher ∆ K than the killer ∆ K value without being the cause of crack initiation ?