PSI - Issue 32

Nataliya Elenskaya et al. / Procedia Structural Integrity 32 (2021) 253–260 N. Elenskaya, M. Tashkinov/ Structural Integrity Procedia 00 (2019) 000 – 000

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4. Conclusions The geometrical models of additively manufactured heterogeneous lattice structures with a gradient of porosity specified by various mathematical formulations were obtained. Modeling of the elastoplastic behavior of these structures was performed with the finite element analysis, taking into account the mechanical properties of the PEEK thermoplastic that were set according to the Johnson-Cook law. The loading curves were obtained and compared during the uniaxial tension of these lattice structures. Influence of the structural parameters and gradient properties on the distribution of stress fields was studied. The obtained results demonstrate possibility of implementation of various elastoplastic mechanical behavior of the porous lattice structures through the variation of The authors gratefully acknowledge financial support from the Government of the Russian Federation under the mega-grant program, contract no. 075-15-2021-578 of May 31, 2021, hosted by Perm National Research Polytechnic University. References Bracaglia, L.G., Smith, B.T., Watson, E., Arumugasaamy, N., Mikos, A.G., Fisher, J.P., 2017. 3D printing for the design and fabrication of polymer-based gradient scaffolds. Acta Biomater. 56, 3 – 13. https://doi.org/10.1016/j.actbio.2017.03.030 Chen, F., Ou, H., Lu, B., Long, H., 2016. A constitutive model of polyether-ether-ketone (PEEK). J. Mech. Behav. Biomed. Mater. 53, 427 – 433. https://doi.org/10.1016/j.jmbbm.2015.08.037 Han, C., Li, Y., Wang, Q., Wen, S., Wei, Q., Yan, C., Hao, L., Liu, J., Shi, Y., 2018. Continuous functionally graded porous titanium scaffolds manufactured by selective laser melting for bone implants. J. Mech. Behav. Biomed. Mater. 80, 119 – 127. https://doi.org/10.1016/j.jmbbm.2018.01.013 Liu, F., Mao, Z., Zhang, P., Zhang, D.Z., Jiang, J., Ma, Z., 2018. Functionally graded porous scaffolds in multiple patterns: New design method, physical and mechanical properties. Mater. Des. 160, 849 – 860. https://doi.org/10.1016/j.matdes.2018.09.053 Ng, J.L., Collins, C.E., Knothe Tate, M.L., 2017. Engineering mechanical gradients in next generation biomaterials – Lessons learned from medical textile design. Acta Biomater. 56, 14 – 24. https://doi.org/10.1016/j.actbio.2017.03.004 Scherer, M.R.J., 2013. Gyroid and Gyroid-Like Surfaces 7 – 19. https://doi.org/10.1007/978-3-319-00354-2_2 Zhang, X.Y., Fang, G., Leeflang, S., Zadpoor, A.A., Zhou, J., 2019. Topological design, permeability and mechanical behavior of additively manufactured functionally graded porous metallic biomaterials. Acta Biomater. 84, 437 – 452. https://doi.org/10.1016/j.actbio.2018.12.013 Zhang, X.Y., Yan, X.C., Fang, G., Liu, M., 2020. Biomechanical influence of structural variation strategies on functionally graded scaffolds constructed with triply periodic minimal surface. Addit. Manuf. 32, 101015. https://doi.org/10.1016/j.addma.2019.101015 the porosity gradient. Acknowledgements