PSI - Issue 38

D. Rigon et al. / Procedia Structural Integrity 38 (2022) 70–76 D. Rigon and G. Meneghetti / Structural Integrity Procedia 00 (2021) 000 – 000

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5. Conclusions A summary of datasets taken from the literature and analysed in previous work by the authors has been presented to highlight the estimation of the fatigue threshold of defective AM alloys by simply measuring the Vickers hardness, HV, and a material-dependent microstructural length l . Previously, an empirical model based on HV and l measurements was calibrated for the estimation of the threshold stress intensity factor for long cracks of wrought as well as AM alloys. Combined with the estimation of the defect-free material as a function of HV, the Atzori Lazzarin Meneghetti (ALM) model could be evaluated, and theoretical estimations were compared with a large dataset of fatigue test results obtained on AM metals for load ratios equal to -1 and 0.1. The ALM model exhibited good agreement with the experimental results. Afkhami S, Dabiri M, Alavi SH, et al (2019) Fatigue characteristics of steels manufactured by selective laser melting. Int J Fatigue 122:72 – 83. https://doi.org/10.1016/j.ijfatigue.2018.12.029 Andreau O, Pessard E, Koutiri I, et al (2021) Influence of the position and size of various deterministic defects on the high cycle fatigue resistance of a 316L steel manufactured by laser powder bed fusion. Int J Fatigue 143:105930. https://doi.org/10.1016/j.ijfatigue.2020.105930 Atzori B, Lazzarin P, Meneghetti G (2003) Fracture mechanics and notch sensitivity. Fatigue Fract Eng Mater Struct 26:257 – 267. https://doi.org/10.1046/j.1460-2695.2003.00633.x Atzori B, Lazzarin P, Meneghetti G (2005) A unified treatment of the mode i fatigue limit of components containing notches or defects. Int J Fract 133:61 – 87. https://doi.org/10.1007/s10704-005-2183-0 Bang DJ, Ince A (2020) A short and long crack growth model based on 2-parameter driving force and crack growth thresholds. Int J Fatigue 141:105870. https://doi.org/10.1016/J.IJFATIGUE.2020.105870 Beretta S, Romano S (2017) A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes. Int J Fatigue 94:178 – 191. https://doi.org/10.1016/j.ijfatigue.2016.06.020 Carlton HD, Haboub A, Gallegos GF, et al (2016) Damage evolution and failure mechanisms in additively manufactured stainless steel. Mater Sci Eng A 651:406 – 414. https://doi.org/10.1016/j.msea.2015.10.073 Carneiro L, Jalalahmadi B, Ashtekar A, Jiang Y (2019) Cyclic deformation and fatigue behavior of additively manufactured 17 – 4 PH stainless steel. Int J Fatigue 123:22 – 30. https://doi.org/10.1016/j.ijfatigue.2019.02.006 Chern AH, Nandwana P, Yuan T, et al (2019) A review on the fatigue behavior of Ti-6Al-4V fabricated by electron beam melting additive manufacturing. Int J Fatigue 119:173 – 184. https://doi.org/10.1016/j.ijfatigue.2018.09.022 Damon J, Hanemann T, Dietrich S, et al (2019) Orientation dependent fatigue performance and mechanisms of selective laser melted maraging steel X3NiCoMoTi18-9-5. Int J Fatigue 127:395 – 402. https://doi.org/10.1016/j.ijfatigue.2019.06.025 El Haddad MH, Smith KN, Topper TH (1979a) Fatigue Crack Propagation of Short Cracks. J Eng Mater Technol 101:42. https://doi.org/10.1115/1.3443647 El Haddad MH, Topper TH, Smith KN (1979b) Prediction of non propagating cracks. Eng Fract Mech 11:573 – 584. https://doi.org/10.1016/0013 7944(79)90081-X Gockel J, Sheridan L, Koerper B, Whip B (2019) The influence of additive manufacturing processing parameters on surface roughness and fatigue life. Int J Fatigue 124:380 – 388. https://doi.org/10.1016/j.ijfatigue.2019.03.025 Hu YN, Wu SC, Wu ZK, et al (2020) A new approach to correlate the defect population with the fatigue life of selective laser melted Ti-6Al-4V. Int J Fatigue 105584. https://doi.org/10.1016/j.ijfatigue.2020.105584 Kan WH, Nadot Y, Foley M, et al (2019) Factors that affect the properties of additively-manufactured AlSi10Mg: Porosity versus microstructure. Addit Manuf 29:100805. https://doi.org/10.1016/j.addma.2019.100805 Lewandowski JJ, Seifi M (2016) Metal Additive Manufacturing: A Review of Mechanical Properties. Annu Rev Mater Res 46:151 – 186. https://doi.org/10.1146/annurev-matsci-070115-032024 Li P, Warner DH, Fatemi A, Phan N (2016) Critical assessment of the fatigue performance of additively manufactured Ti-6Al-4V and perspective for future research. Int J Fatigue 85:130 – 143. https://doi.org/10.1016/j.ijfatigue.2015.12.003 Liu F, He C, Chen Y, et al (2020) Effects of defects on tensile and fatigue behaviors of selective laser melted titanium alloy in very high cycle regime. Int J Fatigue 140:105795. https://doi.org/10.1016/j.ijfatigue.2020.105795 References