SAMPE Journal - November/December 2021 - 54
FEATURE / ADDITIVE MANUFACTURED LATTICE
of dynamic properties, high strength and stiffness,
high dimensional accuracy and high strength/
mass ratio are achieved. Development work
with samples allowed the design methodology
by integrated topology algorithm/CAD design/
FEM analysis to be refined and improved, with
process-based characteristics integrated into the
design space. The combination of a lattice truss
and reinforcing framework hybrid structure proved
to have strength and mass advantages over a pure
lattice type.
A qualification program involving typical
spacecraft development types was performed,
and verified the hybrid AM manufactured part
strength and robustness in launch type vibration
environments. Future development will consider
thermo-elastic and shock environments.
The materials technology aspects are
challenging, managing the process so that reliable
and repeatable parts are produced and the postprocess
operations of heat treatment, cleaning,
inspection and quality control was achieved.
OUTLOOK
The experience and knowledge acquired in the
2 year project built on substantial expertise in
spacecraft design and engineering at LKE and AM
materials processing and technology at NETME.
The key objectives were successfully demonstrated,
particularly for lattice and hybrid designs the
design and analysis process and materials
technology knowledge gained in the project can
be easily transferred into new applications. LKE
have recently purchased a state-of-the art EOS M
400 AM machine, capable of building large parts
up to 400 x 400 x 400 mm size. The team now has
proven skills in design of lightweight lattice and
hybrid lattice/frame configuration components
for spacecraft applications, which can be used to
support your own applications, please contact
Martin Komarek (komarek@lke.cz) or the author
for further information.
REFERENCES
1. [RD1] Thermal Treatments of AlSi10Mg Processed by
Laser Beam Melting. A. Mertens, O. Dedry, D. Reuter.
2. [RD2] SLM 280 Selective Laser Melting Machine
Handbook.
3. [RD3] Additive manufacturing of graded structures in
IN718. P. Wood, U. Gunputh, University of Derby.
Figure 12. FEM analysis model representing vibration test, verified with
results of swept sine tests.
Figure 13. State of the art EOS M 400 laser sintering machine for parts up to
400 x 400 x 400 mm size.
54 | SAMPE JOURNAL | NOVEMBER/DECEMBER 2021
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SAMPE Journal - November/December 2021
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