Potential and limits of modelling as-designed AlSi10Mg lattice structures in 4 different loading conditions
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Additive manufacturing enables the production of complex geometries such as lattice structures out of AlSi10Mg powder. These structures pose a superior light weight potential and there is an increasing need for reliable modelling techniques to use those components in technical applications [1]. A detailed characterization of both as-built and heat treated bulk as well as lattice specimens has been conducted. This involved analyzing the microstructure, identifying imperfections, and conducting rigorous mechanical testing under various load conditions. The results of tension tests on bulk material specimens were used to deduce an isotropic elastic-plastic material model. The experiments performed under compression, shear, torsion and tension loads were compared to their virtual equivalents. By utilizing numerical modeling and the as-designed lattice geometry, the overall structural behavior was successfully simulated and predicted. [2] The freedom of geometric design in laser powder bed manufacturing and a detailed knowledge of the microstructure with respect to the process parameters offer almost endless possibilities to manufacture components with specific mechanical properties. This multitude of possibilities also poses challenges that will be addressed by the DFG research training group 2868 “Data-driven design of resilient metamaterials” where data-driven approaches to cross-scale materials discovery and design will be developed and applied. [3] REFERENCES [1] T. Maconachie, M. Leary, B. Lozanovski, X. Zhang, M. Qian, O. Faruque, et al.. SLM lattice structures: Properties, performance, applications and challenges, Materials & Design 183, 108137, 2019. [2] U. Gebhardt, T. Gustmann, L. Giebeler, F. Hirsch, J.K. Hufenbach and M. Kästner. Additively manufactured AlSi10Mg lattices – Potential and limits of modelling as-designed structures, Materials & Design 220, 110796, 2022. [3] https://tu-dresden.de/ing/forschung/graduiertenkollegs/grk2868