PSI - Issue 66

Vladimír Chmelko et al. / Procedia Structural Integrity 66 (2024) 426–432 Author name / Structural Integrity Procedia 00 (2025) 000–000

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Surface roughness as a result of bailling

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‐ Different slope of S-N curves for normal and shear stresses

Based on the presented results, it can be concluded that in terms of fatigue properties, the defects caused by the additive technology are the key factor [16]. These, by their orientation, determine the anisotropy of the cyclic properties in combination with the sensitivity of the material to these defects. Also, these defects in combination with the crack propagation mode result in a different slope of the curves  a =f(N f ) versus  a =f(N f ), which causes difficulties in the assessment of additively manufactured components under multiaxial fatigue conditions. Acknowledgements The project with the designation FW01010462 entitled "Computational and experimental support for 3D printing of metal components made by DMLS technology and exposed to multiaxial fatigue loading" was financially supported by the Technology Agency of the Czech Republic.This work was supported by the Slovak Educational Grant Agency under the contract No. KEGA-038STU-4/2022. References 1. Milne, I., Ritchie, R.O., Karihaloo, B., 2003. Comprehensive Structural Integrity, Vol.4. Cyclic loading and fatigue, Elsevier 2003 2. Taylor, D. Geometrical effects in fatigue: A unifying theoretical model. Int. J. Fatigue 1999, 21, 413–420. https://doi.org/10.1016/S0142 1123(99)00007-9. 3. Pilkey, W.J. Peterson´s Stress Concentration Factors; John Wiley &Sons, Inc.: Hoboken, NJ, USA, 1997. 4. Gorelik, M. Additive Manufacturing in the Context of Structural Integrity. Int. J. Fatigue 2016, 94, 168–177. [CrossRef] 5. Yadollahi, A.; Shamsaei, N. Additive manufacturing of fatigue resistant materials: Challenges and opportunities. Int. J. Fatigue 2017, 98, 14– 31. [CrossRef] 6. Molaei, R.; Fatemi, A. Fatigue Design with Additive Manufactured Metals. Procedia Eng. 2018, 213, 5–16. [CrossRef] 7. Chmelko, V.; Šulko, M.; Škriniarová, J.; Margetin, M.; Gašparík, M.; Koš  co, T.; Semeš, M. Strength and Cyclic Properties of Additive vs. Conventionally Produced Material AlSi10Mg. Materials 2023, 16, 2598. https://doi.org/10.3390/ma16072598 8. Gerov, M.V.; Vladislavskaya, E.Y.; Terentev, V.F.; Prosvirnin, D.V.; Antonova, O.S.; Kolmakov, A.G. Fatigue Strength of an AlSi10Mg Alloy Fabricated by Selective Laser Melting. Russ. Metall. 2018, 4, 392–397. [CrossRef] 9. Beretta, S.; Romano, S. A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes. Int. J. Fatigue 2017, 94, 178–191. [CrossRef] 10. Tang, M.; Pistorius, P.C. Oxides, porosity and fatigue performance of AlSi10Mg parts produced by selective laser melting. Int. J. Fatigue 2017, 94, 192–201. [CrossRef] 11. Gockel, J.; Sheridan, L.; Koerper, B.; Whip, B. The influence of additive manufacturing processing parameters on surface roughness and fatigue life. Int. J. Fatigue 2019, 124, 380–388. [CrossRef] 12. Zhang, J.; Yuan, W.; Song, B.; Yin, S.; Wang, X.; Wei, Q.; Shi, Y. Towards understanding metallurgical defect formation of selective laser melted wrought aluminum alloys. Adv. Powder Technol. 2022, 1, 100035. [CrossRef] 13. Sames, W.J.; List, F.A.; Pannala, S.; Dehoff, R.R.; Babu, S.S. The metallurgy and processing science of metal additive manufacturing. Int. Mater. Rev. 2016, 61, 315–360. [CrossRef] 14. Lu, H.; Pan, J.; Gu, Y.; Xiao, J.; Ma, C.; Yu, N. Comparison of melt evolution and flow mechanisms of Inconel 718, Ti6Al4V, 304 stainless steel, and AlSi10Mg manufactured by laser powder bed fusion, structures, and properties after heat treatments. Mater. Sci. Eng. A 2023, 865, 144649. [CrossRef] 15. Yadollahi, A.; Mahmoudi, M.; Elwany, A.; Doude, H.; Bian, L.K.; Newman, J.C. Fatigue-life prediction of additively manufactured material: Effects of heat treatment and build orientation. Fatigue Fract. Eng. Mater. Struct. 2020, 43, 831–844. [CrossRef] 16. Plessis, A.; Beretta, S. Killer notches: The effect of as-built surface roughness on fatigue failure in AlSi10Mg produced by laser powder bed fusion. Addit. Manuf. 2020, 35, 101424. [CrossRef]