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Additive Manufacturing of Heterogeneous Lattice Structures: An Experimental Exploration

Part of: Design for Additive Manufacturing

Published online by Cambridge University Press:  26 July 2019

Francesco Leonardi ,
Serena Graziosi ,
Riccardo Casati ,
Francesco Tamburrino  and
Monica Bordegoni
Francesco Leonardi
Affiliation:
Politecnico di Milano, Italy;
Serena Graziosi*
Affiliation:
Politecnico di Milano, Italy;
Riccardo Casati
Affiliation:
Politecnico di Milano, Italy;
Francesco Tamburrino
Affiliation:
University of Pisa, Italy
Monica Bordegoni
Affiliation:
Politecnico di Milano, Italy;
*
Contact: Graziosi, Serena, Politecnico di Milano, Department of Mechanical Engineering, Italy, serena.graziosi@polimi.it

Abstract

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3D printed heterogeneous lattice structures are beam-and-node based structures characterised by a variable geometry. This variability is obtained starting from a periodic structure and modifying the relative density of the unit cells or by combining unit cells having different shapes. While several consolidated design approaches are described to implement the first approach, there are still computational issues to be addressed to combine different cells properly. In this paper, we describe a preliminary experimental study focused on exploring the design issues to be addressed as well as the advantages that this second type of heterogeneous structures could provide. The Three-Point-Bending test was used to compare the behaviour of different types of heterogeneous structures printed using the Fused Deposition Modeling (FDM) technology. Results demonstrated that the possibility of combining multiple unit cells represents a valid strategy for performing a more effective tuning of the material distribution within the design space. However, further studies are necessary to explore the behaviour of these structures and develop guidelines for helping designers in exploiting their potential.

Keywords

Design for Additive Manufacturing (DfAM)3D printingLightweight designHeterogeneous lattice structures
Type
Article
Information
Proceedings of the Design Society: International Conference on Engineering Design , Volume 1 , Issue 1 , July 2019 , pp. 669 - 678
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.
Copyright
© The Author(s) 2019

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