PSI - Issue 37

Iulian Constantin Coropețchi et al. / Procedia Structural Integrity 37 (2022) 755 – 762 Coropetchi et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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5. Conclusions After analyzing the results obtained with the Greedy algorithm and the formulations of the objective functions, we can state that f or a specific material combination of a structure we can find multiple “optimal” solutions for the material distribution, depending on our objectives. We proved that the formulation of the objective function affects in great proportions the result obtained with a Greedy algorithm and we can emphasize that selecting the right formulation for the objective function is a difficult task. Although we proved that the third formulation of the objective function gives better results than the first one, the algorithm doesn’t always reach one of the optimal solutions known from the brute force approach and needs further improvement. Acknowledgements This work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation, CCCDI - UEFISCDI, project number ERANET-M-RIPE4TEC-1, within PNCDI III. References Gao, H., Ji, B., Jäger, I.L., Arzt, E., Fratzl, P., 2003. Materials become insensitive to flaws at nanoscale: Lessons from nature, Proceedings of the National Academy of Sciences of the United States of America, 100, 5597 – 5600, www.pnas.org/cgi/doi/10.1073/pnas.0631609100. Gu, G.X., Dimas, L, Qin, Z., Buehler, M.J., 2016. Optimization of Composite Fracture Properties: Method, Validation, and Applications, Journal of Applied Mechanics, Transactions ASME 83, 1 – 7, doi: 10.1115/1.4033381. Kaszynski, A., Williams, D., Xavier, J., Kreuter, D., Capodiferro, M., 2021. pyansys/pymapdl: PyMAPDL 0.59.5 Release Notes. https://github.com/pyansys/pymapdl/releases , accessed September 22, 2021. Kramer, O., 2017. Genetic Algorithms Essentials (Studies in Computational Intelligence, 679), 1st ed., Springer, 2017. Radi, K., 2020. Bioinspired materials : Optimization of the mechanical behavior using Discrete Element Method , PhD Thesis, Université Grenoble Alpes, 2019.