PSI - Issue 57

Kalle Lipiäinen et al. / Procedia Structural Integrity 57 (2024) 32–41 Lipiäinen et al. Structural Integrity Procedia 00 (2019) 000 – 000

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4. Conclusions This paper introduced a 4R method application on PBF-manufactured AM-components. Based on the analysis, fatigue performance assessment considering geometry and quality aspects in respect to master curve was found recommended fatigue strength assessment and it can be considered well suitable and promising for AM-structures. Further analysis on verification with case examples is still needed. The study demonstrated that reporting detailed SEM fractography on AM- specimens’ fatigue test is important to conside r the influence of quality on fatigue performance. The presented workflow will be used to construct future studies on component level AM-products. The authors wish to thank DREAMS project funded by Business Finland for support and Mr. Joonas Pyörret for help in numerical analysis. References Afkhami, S., Dabiri, E., Lipiäinen, K., Piili, H., & Björk, T. (2021). Effects of notch-load interactions on the mechanical performance of 3D printed tool steel 18Ni300. Additive Manufacturing , 47 , 102260. https://doi.org/10.1016/j.addma.2021.102260 Afkhami, S., Dabiri, M., Piili, H., & Björk, T. (2021). Effects of manufacturing parameters and mechanical post processing on stainless steel 316L processed by laser powder bed fusion. Materials Science and Engineering A , 802 . https://doi.org/10.1016/j.msea.2020.140660 Afkhami, S., Javaheri, V., Lipiäinen, K., Amraei, M., Dabiri, E., & Björk, T. (2022). Fatigue performance of stainless tool steel CX processed by laser powder bed fusion. Materials Science and Engineering A , 841 (March). https://doi.org/10.1016/j.msea.2022.143031 Ahola, A., Skriko, T., & Björk, T. (2020). Fatigue strength assessment of ultra-high-strength steel fillet weld joints using 4R method. Journal of Constructional Steel Research , 167 . https://doi.org/10.1016/j.jcsr.2019.105861 Hensel, J., Müller, J., Scharf-wildenhain, R., Uhlenberg, L., & Hälsig, A. (2022). Effects of building position on surface and fatigue of DED-arc steel components (IIW Document XIII-2927-2022). IIW Document , 2022 . Li, A., Baig, S., Liu, J., Shao, S., & Shamsaei, N. (2022). Defect criticality analysis on fatigue life of L-PBF 17-4 PH stainless steel via machine learning. International Journal of Fatigue , 163 . https://doi.org/10.1016/j.ijfatigue.2022.107018 Lipiäinen, K., Afkhami, S., Ahola, A., & Björk, T. (2022). Evaluation of geometrical notch and quality effects in the fatigue strength assessment of ultra-high-strength steel cut edges . 37 (January), 14. https://doi.org/10.1016/j.istruc.2022.01.069 Lipiäinen, K., Ahola, A., & Björk, T. (2022). Fatigue performance of hot-dip galvanized ultra-high-strength steel laser cut notches under constant and variable amplitude loading (IIW doc. XIII-2934-2022). IIW Document , Tokyo . Lipiäinen, K., Ahola, A., Kaijalainen, A., & Björk, T. (2022). Fatigue performance of notched and hot-dip galvanized laser and mechanically cut S960 steel components considering local defects with the theory of critical distances. International Journal of Fatigue , 164 (April), 107127. https://doi.org/10.1016/j.ijfatigue.2022.107127 Murakami, Y. (2002). Metal Fatigue: Effects of Small Defects and Nonmetallic Inclusions . Elsevier. Nykänen, T., & Björk, T. (2015). Assessment of fatigue strength of steel butt-welded joints in as-welded condition - Alternative approaches for curve fitting and mean stress effect analysis. Marine Structures , 44 , 288 – 310. https://doi.org/10.1016/j.marstruc.2015.09.005 Solberg, K. (2021). Fatigue design for metallic components produced by additive manufacturing Doctoral thesis . Solberg, K., & Berto, F. (2019). Notch-defect interaction in additively manufactured Inconel 718. International Journal of Fatigue , 122 , 35 – 45. https://doi.org/10.1016/j.ijfatigue.2018.12.021 Solberg, K., Wan, D., & Berto, F. (2020). Fatigue assessment of as-built and heat-treated Inconel 718 specimens produced by additive manufacturing including notch effects. Fatigue and Fracture of Engineering Materials and Structures , 43 (10), 2326 – 2336. https://doi.org/10.1111/ffe.13300 Taylor, D. (2008). The theory of critical distances. Engineering Fracture Mechanics . Acknowledgements