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Compressive behavior of lattice structures in solid shells manufactured by SLM

: Merkt, S.

Kaplan, A. (Hrsg.); Engström, H. (Hrsg.) ; Univ. of Technology, Lulea:
14th NOLAMP Conference, the 14th Nordic Laser Materials Processing Conference : August 26th – 28th 2013, Gothenburg, Sweden
Lulea: Universitetstryckeriet, 2013
ISBN: 978-91-7439-688-1
ISBN: 978-91-7439-689-8
Nordic Conference on Laser Materials Processing (NOLAMP) <14, 2013, Gothenburg>
Fraunhofer ILT ()

Lattice structures belong to the group of complex structures that can be manufactured in almost any arbitrary shape by Selective Laser Melting (SLM). Particularly for light-weight applications the outstanding mechanical properties of lattice structures such as the high ratio of stiffness / weight are from great interest. Current investigations are undertaken to comprehensively understand the behavior of lattice structures under various loading to explore the design freedom given by SLM. This paper presents first results about the compressive behavior of f2ccz-type lattice structures in solid shells made of 316L-powder. FEM-simulations are carried out to better understand the compressive behavior of lattice structure in solid shells. To determine the influence of side shells and top shells compressive tests are performed on specimens with and without top shells according to DIN 50134. Transition layers are needed to overcome process restrictions to manufacture shells on lattice structures without build errors. A comparison of different types of transition layers situated between lattice structures and top shells is given. Derived from this, design rules to manufacture solid shells on lattice structures with varying cell widths are presented to improve stability and surface quality of top shells.