PSI - Issue 68

Antti Järvenpää et al. / Procedia Structural Integrity 68 (2025) 619–625 Antti Järvenpääa et al. / Structural Integrity Procedia 00 (2025) 000–000

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Fig. 8. Comparison between the compressive (a) yield strength; (b) Young’s modulus of the gyroid and stochastic lattices of the present study with literature example by Barba et al. 2019. 4. Conclusions Gyroid and stochastic lattice structures were successfully manufactured by laser powder bed fusion technology with relative densities from 0.1 to 0.5 to compare the static strength and elasticity both in tension and compression. Following conclusions can be made from the static testing: • The measured yield strengths were consistently higher with gyroid lattices. Gyroid lattices were in average ~15% (compression) and ~30% (tension) stronger than the stochastic lattices. • 20% lower YS values were measured in tension than in compression for the stochastic structures. The difference for the gyroid structures was only 6%, showing more isotropic strength properties. • Both lattice types were ~3x stiffer (Young’s modulus +300%) in tension than in compression and the anisotropy increased as the relative density increased, reaching its highest value of 0.15 at a relative density of 0.5. Acknowledgements The authors express their gratitude for the financial assistance provided by Business Finland for the DREAMS project. Research Vicerrectory of Tecnológico de Costa Rica for funding the experimental work and the Finnish National Agency for Education (EDUFI) for the scholarship that enabled this international collaboration. References Soro, N., Brodie, E.G., Abdal-Hay, A., Alali, A.Q., Kent, D., Dargusch, M.S., 2022. Additive manufacturing of biomimetic titanium-tantalum lattices for biomedical implant applications, Material Design 218, 110688. Barba, D., Alabort, E., Reed, R., 2019. Synthetic bone: design by additive manufacturing, Acta Biomater. 97, 637–656 McGregor, M., Patel, S., McLachlin, S., Vlasea, M., 2021. Architectural bone parameters and the relationship to titanium lattice design for powder bed fusion additive manufacturing, Addit. Manuf. 47, 102273. Yu, G., Li, X., Dai, L., Xiao, L., Song, W., 2022. Compressive properties of imperfect Ti-6Al-4V lattice structure fabricated by electron beam powder bed fusion under static and dynamic loadings, Addit. Manuf. 49, 102497 Bobbert, F., Lietaert, K., Eftekhari, A., Pouran, B., Ahmadi, S., Weinans, H., Zadpoor, A., 2017. Additively manufactured metallic porous biomaterials based on minimal surfaces: a unique combination of topological, mechanical, and mass transport properties, Acta Biomater. 53 (2017) 572–584. Araya, M., Jaskari, M., Rautio, T., Guillen, T., Järvenpää, A., 2024. Assessing the compressive and tensile properties of TPMS-Gyroid and stochastic Ti64 lattice structures: A study on laser powder bed fusion manufacturing for biomedical implants. Journal of Science: Advanced Materials and Devices 9, 100663 Araya, M., Järvenpää, A., Rautio, T., Morales-Sanchez, J.E., Guillen-Giron., T., 2024. Comparative fatigue performance of as-built vs etched Ti64 in TPMS-gyroid and stochastic structures fabricated via PBF-LB for biomedical applications,.Rapid Prototyping Journal 11 (Vol 30), 216-229.