PSI - Issue 2_A

José A.F.O. Correia et al. / Procedia Structural Integrity 2 (2016) 3272–3279 Correia et al. / Structural Integrity Procedia 00 (2016) 000–000

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Fig. 6. Fatigue crack growth data for the 6028-T6 aluminium alloy: standard CT geometry.

Fig. 7. Fatigue crack growth data for the 6028-T6 aluminium alloy: CT geometry with circular notch.

4. Conclusions The study aimed at characterizing the fatigue crack propagation rates behavior of the 6028-T6 aluminum alloy using for this purpose two distinct configurations of notches (sharp and curved notches). The configuration of the notch appears to have an important effect in the estimation of the Δ K th , the round notch resulting in higher value of stress threshold. The K -decreasing procedure of the ASTM E 647 standard demonstrated to be efficient in determination of Δ K th . The constants of the Paris law are similar for the two CT geometries studied, such as expected. Acknowledgements The authors acknowledge the Portuguese Science Foundation (FCT) for the financial support through the post doctoral grant SFRH/BPD/107825/2015. Authors gratefully acknowledge the funding of SciTech - Science and Technology for Competitive and Sustainable Industries (NORTE-01-0145-FEDER-000022), R&D project cofinanced by Programa Operacional Regional do Norte (“NORTE2020”), through Fundo Europeu de Desenvolvimento Regional (FEDER).