SAMPE Journal - January/February 2021 - 12
FEATURE / PRE-PREG L AT TICE STRUCTURES
Figure 9. Left - Failure locations in the large
cylinder. Right - Failure index in corresponding
region of the FE model.
FUTURE DEVELOPMENTS
A follow-up ESA-funded CTP program aimed at advancing the lattice technology to TRL6 is currently in
progress. This programme focuses on the interfaces
between the cylinder and its surrounding structures,
with specific emphasis on connections to a metallic
end ring and different attachment types (brackets,
tank struts, shear webs, etc.).
Furthermore, the automation of the layup process is a development which will offer many advantages. In collaboration with the University of Limerick, research on this topic is currently ongoing.
CONCLUSIONS
Through this successfully completed programme,
the development of fibre-placed lattice structures
have has been advanced significantly. A near fullscale cylinder was successfully manufactured and
tested under satellite-representative loads, without
failure. A subsequent test to failure showed significant margin on overall strength, and a good correlation to the established modelling method. The tests
and developments performed cover what is typically required to reach TRL5.
Follow-up projects to advance the technology
further to TRL6 are in progress. Development is on track to further the practical application of the technology in
satellite structures.
ACKNOWLEDGMENTS
The developments presented in this
paper, and the CTP these developments were a part of, were funded by
the European Space Agency. Their
support is greatly appreciated.
REFERENCES
1. V.V. Vasiliev, V.A. Barynin, A.F. Razin,
Composite Structures 94, Issue 3 (2012)
1117-1127.
2. L. Pavlov, I. te Kloeze, B.J.R. Smeets,
S.M. Simonian, ECSSMET 2016, Toulouse,
France.
3. B.J.R. Smeets, L. Pavlov, C. Kassapoglou,
ECSSMET 2016, Toulouse, France.
4. L. Pavlov, B. Smeets, S.M. Simonian,
AIAA 2016-1497.
5. V.K. Maes, L. Pavlov, S.M. Simonian, Composite Structures 209 (2019) 1042-1049.
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