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A CAD-based Workflow and Mechanical Characterization for Additive Manufacturing of Tailored Lattice Structures

CAD-basierter Workflow und mechanische Charakterisierung addititiv gefertigter, maßgeschneiderter Gitterstrukturen
: Korn, Hannes; Koch, Peter; Kordaß, Richard; Holzhausen, Stefan; Schöne, Christine; Müller, Bernhard; Stelzer, Ralph

Bourell, D.L. ; Univ. of Texas, Austin:
Solid Freeform Fabrication 2018 : Proceedings of the 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, August 13-15, 2018, the University of Texas at Austin
Austin, Tex.: University of Texas, 2018
Solid Freeform Fabrication Symposium (SFF) <29, 2018, Austin/Tex.>
Conference Paper
Fraunhofer IWU ()
laser beam melting; lattice structure; lightweight design; material characterization; compression test; CAD; design; slicer

Lattice structures are highly recommended for lightweight applications and cost reduction in additive manufacturing (AM). Currently, parts with lattice structures are still mainly used for illustrative purposes and rarely in industrial products. One important reason is that, due to their high dependency on macro- and micro-geometry, the mechanical properties of manufactured structures are difficult to predict. Thus, even and precise struts are needed. In this paper, a workflow for fabrication of lattice structures with strut-diameters from 150 µm to 400 µm on commercial LBM systems is presented. Based on a CAD-integrated user-interface for lattice design, a customized slicing algorithm determines database-aided suitable exposure parameters which ensure that the properties of the manufactured struts will precisely be as specified upon design. Subsequently, compression tests are performed in order to verify the established workflow. The developed tool enables designers to integrate AM-specific geometries into their components without specific experience in AM.