PSI - Issue 68

Ivan Senegaglia et al. / Procedia Structural Integrity 68 (2025) 610–618

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Ivan Senegaglia at al. / Structural Integrity Procedia 00 (2025) 000–000

Figure 7: Elastic cycle responses: a) Experimental acquisition for each cycle; b) Comparison between experimental and FE models calculations.

4. Conclusions The apparent elastic modulus of a gyroid TPMS lattice structure was investigated after different pre-strain levels had been applied by compression. The experimental activities and the FE models allowed us to investigate the effect of significant macroscopic deformation on the stiffness of the lattice structure. The experimental results showed that the structure features a small E* variation even when significant plastic strains are present. In fact, despite significant plastic deformation leading to large permanent strain (up to 10%), the specimen's elastic response shows low variability, ranging from 15.08 to 16.38 GPa. Despite their simplistic nature as surrogate models, the FE models were able to partially capture the behavior of the structure, with promising results applying the partial PBCs constrained RVE configuration. Lattice structures can be successfully adopted for energy absorption structures for automotive components. The results of the present activity show that they can be used for the production of a shock absorber that can withstand multiple moderate impacts preserving the same stiffness or inducing a geometrically activated stress-stiffening behavior. Acknowledgments Financed by the European Union - NextGenerationEU (National Sustainable Mobility Center CN00000023, Italian Ministry of University and Research Decree n. 1033 - 17/06/2022, Spoke 11 - Innovative Materials & Lightweighting). The opinions expressed are those of the authors only and should not be considered as representative of the European Union or the European Commission’s official position. Neither the European Union nor the European Commission can be held responsible for them. References Abruzzo, M., Macoretta, G., Monelli, B.D., Romoli, L., 2024. Impact of process parameters on the dynamic behavior of Inconel 718 fabricated via laser powder bed fusion. Int J Adv Manuf Technol. https://doi.org/10.1007/s00170-024-13526-7 Beghini, M., Grossi, T., Macoretta, G., Monelli, B.D., Senegaglia, I., Turco, P.D., Fardelli, A., Morante, F., 2024. Tuning Modal Behavior of Additively Manufactured Lattice Structures. Journal of Engineering for Gas Turbines and Power 146, 071008. https://doi.org/10.1115/1.4064264 Boursier Niutta, C., Ciardiello, R., Tridello, A., 2022. Experimental and Numerical Investigation of a Lattice Structure for Energy Absorption: Application to the Design of an Automotive Crash Absorber. Polymers 14, 1116. https://doi.org/10.3390/polym14061116 Dallago, M., Raghavendra, S., Luchin, V., Zappini, G., Pasini, D., Benedetti, M., 2021. The role of node fillet, unit-cell size and strut orientation on the fatigue strength of Ti-6Al-4V lattice materials additively manufactured via laser powder bed fusion. International Journal of Fatigue 142, 105946. https://doi.org/10.1016/j.ijfatigue.2020.105946 Macoretta, G., Bertini, L., Monelli, B.D., Berto, F., 2023. Productivity-oriented SLM process parameters effect on the fatigue strength of Inconel 718. International Journal of Fatigue 168, 107384. https://doi.org/10.1016/j.ijfatigue.2022.107384