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Proceedings Paper • Open Access

Stability study of MMC tubes and advanced assemblies for telescope structures
Author(s): Martine Nivet-Lutz; Gilles Pommatau

Paper Abstract

This paper presents new advances concerning the development of an Aluminum Matrix Composite for dimensionally stable satellite structures. Feasibility of thermally stable thin-walled tubes have been acquired through microstructure observation and Coefficient of Thermal Expansion measurement.

In order to fit the thermo-mechanical stability domain of tubes on specifications, 3 thermal cycles have been tested, regarding to relaxation of internal stress and changes in macroscopic thermo-mechanical properties. Experimental expansion curves and microstructure observation show that thermal treatments permitts such a good fitting. For a better understanding of physical internal phenomena, internal stress has been measured by neutron diffraction on tube samples after each thermal treatment. Results show a significant decrease of stress due to cycling in cold temperature.

In order to decrease the absolute value of CTE of assemblies, a new concept of thermo-mechanical stable linkage has been developped, which consists in a common alumlinum infiltration of superposed carbon preforms. Structural bonding, which usually affects stability properties and impose surface treatments and polymerization, can so be avoided.

The study has been achieved through CNES (Centre National d’Etudes Spatiales) and French Ministry of Defense (DGA) supports.

Paper Details

Date Published: 21 November 2017
PDF: 11 pages
Proc. SPIE 10569, International Conference on Space Optics — ICSO 2000, 105691L (21 November 2017); doi: 10.1117/12.2307925
Show Author Affiliations
Martine Nivet-Lutz, Alcatel Space Industries (France)
Gilles Pommatau, Alcatel Space Industries (France)


Published in SPIE Proceedings Vol. 10569:
International Conference on Space Optics — ICSO 2000
Georges Otrio, Editor(s)

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