Computer Science
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..567p&link_type=abstract
In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla
Computer Science
Space Environment, Materials
Scientific paper
A test facility for the measurement of the length variation of polymer composites due to moisture evaporation is described. The measurement method is based on commercial laser interferometers with a resolution of 10nm and working under vacuum conditions yields a total accuracy of 0,1μm. The high sensitivity and resolution of the test facility is shown by CTE experiments with copper and Invar samples. The CTE results are in the expected range although the considered temperature regime is very small. CME measurements were performed on simple lay ups - unidirectional and bidirectional material - of carbon fibre reinforced polymers, which were preconditioned in water at a temperature of 50°C. Two methods for the determination of Δm - determination of the initial and final sample weight (method 1) - online-measurement of the sample weight during outgassing under vacuum condition (method 2) are presented and a comparison of the CME results confirms the time effectiveness and reliability of the method 2. The CME values for the chosen material are in the range of 5E-6/% to 1E-2/%.
Defoort B.
Poenninger A.
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