PSI - Issue 83

Teresa Morgado et al. / Procedia Structural Integrity 83 (2026) 286–294

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is the most accurate. The 3D study using the Contour Integral Method showed very good results, with narrow ranges of percentage errors in SIF, JIT, and fatigue crack propagation for Ti-6Al-4V alloy produced by additive manufacturing. The percentage error for SIF presents excellent values (below 5%), and the percentage error for JIT and crack critical presents very good values (below 10%). Nevertheless, more studies must be conducted by the scientific community on metallic alloy parts produced by additive manufacturing. Acknowledgements The authors acknowledge National funds from FCT, I.P. – Fundação para a Ciência e a Tecnologia, which financed this work in the scope of the project UID/00667/2025 (https://doi.org/10.54499/UID/00667/2025) (UNIDEMI) and through the grant with the designation 2024.13040.PRT. References Alves J., Morgado T., Galvão I., Pereira A., Pereira M., 2024. Development of a Life Prediction Model of Ti-6Al-4V alloy obtained by Additive Manufacturing. Structural Integrity Procedia, Volume 53, Pages 236-245, Elsevier, ESIS- PH. https://doi.org/10.1016/j.prostr.2024.01.029 Amendola, A., Smith, C. J., Goodall, R., Auricchio, F., Feo, L., Benzoni, G., & Fraternali, F., 2016. Experimental response of additively manufactured metallic pentamode materials confined between stiffening plates. Composite Structures, 142, 254–262. https://doi.org/10.1016/J.COMPSTRUCT.2016.01.091 Anderson T. L., 1990. Elastic-Plastic Fracture Mechanics. A Critical Review. Part 1, Texas University, College Station. Anderson, T. L., 2017. Fracture Mechanics: Fundamentals and Applications, Fourth Edition. CRC Press. ASM Handbook, 1996. Fatigue and Fracture. Volume 19, ASM International. ASTM E1290-07. Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement. Developed by Subcommittee: E08.07, Book of Standards Volume:03.01, West Conshohocken, USA. ASTM E647-05. Standard Test Method for Measurement of Fatigue Crack Growth Rates. Developed by Subcommittee E08.06, Book of Standards Volume 03.01, West Conshohocken, USA. Baghi, A. D., Nafisi, S., Hashemi, R., Ebendorff-Heidepriem, H., Ghomashchi, R. 2001. Effective post processing of SLM fabricated Ti-6Al-4V alloy vs thermal treatment. Journal of Manufacturing, 68, pages 1031-1046.https://doi.org/10.1016/j.mapro.2021.06.035 Becker, W. T. and Shipley, R. J., 2002. Failure analysis and prevention. ASM International, vol. 11. Boyer R., 1995. Titanium for Aerospace: Rationale and Applications. Kluwer Academic Publishers. Cain, V., Thijs, L., Van Humbeeck, J., Van Hooreweder, B., Knutsen, R., 2014. Crack propagation and Fracture toughness of Ti6Al4V alloy produced by selective laser melting. Additive Manufacturing, 5, pages 68-76. http://dx.doi.org/10.1016/j.addma.2014.12.006 Campbell, F. C. 2012. Fatigue and Fracture: Understanding the Basics. ASM International. Cao, S., Chen, Z., Lim, C. V. S., Yang, K., Jia, Q., Jarvis, T., Wu, X. (2017, December 1). Defect, Microstructure, and Mechanical Property of Ti 6Al-4V Alloy Fabricated by High-Power Selective Laser Melting. JOM, Vol. 69, pp. 2684–2692. Minerals, Metals and Materials Society. https://doi.org/10.1007/s11837-017-2581-6 Edwards, P., and Ramulu, M., 2015. Fracture toughness and fatigue crack growth in Ti-6Al-4V friction stir welds. Fatigue and Fracture of Engineering Materials and Structures, 38(8), pages 970–982. https://doi.org/10.1111/ffe.12291 Froes F. H., 2015. Titanium: physical metallurgy, processing, and applications. ASM International. Gurrappa I., 2003. Characterisation of titanium alloy Ti-6Al-4V for chemical, marine and industrial applications. Mater Charact, vol. 51, n. 2–3, pages 131–139. https://doi.org/ 10.1016/j.matchar.2003.10.006. Hartunian, P., & Eshraghi, M., 2018. Effect of build orientation on the microstructure and mechanical properties of selective laser-melted Ti-6Al Kok Y., Tan, X. P., Wang, P., Nai, M. L. S., Loh, N. H., Liu, E., Tor, S. B. 2018. Anisotropy and heterogeneity of microstructure and mechanical properties in metal additive manufacturing. A critical review. Materials and Design, 129, pages 565-586. https://doi.org/10.1016/j.matdes.2017.11.021 Morgado T., Dias R., 2023. Study of extended and generalised finite element methods in 2D and 3D applied to a single edge notched bending test. Procedia Structural Integrity, Volume 47, Pages 882-887, ISSN 2452-3216. https://doi.org/10.1016/j.prostr.2023.07.031 Nguyen, H. D., Pramanik, A., Basak, A. K., Dong, Y., Prakash, C., Debnath, S., Buddhi, D., 2022. A critical review on additive manufacturing of Ti-6Al-4V alloy: microstructure and mechanical properties. Journal of Materials Research and Technology, 18, 4641–4661. https://doi.org/10.1016/J.JMRT.2022.04.055 Paris, P.C, Gomez, R. E., Anderson, W. E., 1961. A rational analytic theory of fatigue. Trend Eng, 13 (1):9-14. Paris, P.C. and Erdogan, F., 1963. A critical analysis of crack propagation laws. J. Bas.Eng., Trans. ASME, p 528, 163. Rafi, H.K., Karthik, N. V., Gong, H., Starr, T., Stucker, B., 2013. Microstructures and Mechanical Properties of Ti6Al4V parts fabricated by Selective Laser Melting and Electron Beam Melting.JMEPE 22:3872-3883, ASM. https://doi.org/10.1007/s11665-013-0658-0 4V Alloy. Journal of Manufacturing and Materials Processing, 2(4). https://doi.org/10.3390/jmmp2040069 Leyens C. and Peters M., 2003. Titanium and titanium alloys: fundamentals and applications. Wiley-VCH.