Computer Science – Sound
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..206s&link_type=abstract
(Modelling, simulation and sounding of cometary nuclei; Proceedings of the International Workshop, Cagliari, Italy, May 28-30, 1
Computer Science
Sound
7
Comet Nuclei, Mineralogy, Mission Planning, Regolith, Space Environment Simulation, Space Missions, Astronomical Models, Compression Tests, Microstructure, Penetration, Petrography, Thermal Conductivity
Scientific paper
The paper reviews a geological model of the regolith of cometary nuclei and the current status of a premission test program with cometary analog material with regard to the Rosetta Comet Sample Return Mission. Cometary analog material was prepared from four major end-member components and their mixtures using natural and synthetic materials. Results of penetration tests show that the force required to pierce a teflon rod into porous snow (H2O/CO2)-olivine-montmorillonite mixtures with layers of variable coherence varied from 0.15 to 5 MPa (at about 100 K). Results of compression tests indicate that the compressive strength of snow (H2O)-olivine-montmorillonite-kaolinite-tuff mixtures (0.5 and 0.8 Mg/cu cm) increased from 1.5 to 7.5 MN/sq m if temperatures were decreased from 253 to 123 K. A technique was developed to prepare polished sections and thin sections of snow-dust mixtures. It makes it possible to quantify the microtexture of the test samples by stereometric analysis and to monitor their properties induced by sublimation, compression, and drilling tests.
Dueren Helmi
Stoeffler Dieter
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