Computer Science
Scientific paper
Sep 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.1457c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 9, pp.1457-1462
Computer Science
4
Scientific paper
Various brittle and ductile materials were subjected to bombardment by small particles and the mechanisms and relative rates of mass loss were compared. Among the samples studied were the meteorites Indarch and Hoba, a chondrite and an iron, respectively. With 50 alumina particles at approximately 0.3 km/sec, experiments with terrestrial materials showed that the mass loss was greater for the less ductile specimens. This trend was also observed at higher velocity. At 2.6 km/sec, 6 silicon carbide particles caused Indarch to erode at a rate of about 3 × 10 -4 cm/J/cm 2 of incident kinetic energy. Identical bombardment of a magnetite single crystal, and additional bombardment of Indarch by 7 iron particles, yielded erosion rates that differed by less than 50 % from the one quoted above. By contrast, the maximum rate of erosion from Hoba was found to be at least two orders of magnitude smaller than that of Indarch. These results and analogous results from the literature are compared with the theoretical treatment of Öpik. Theory and experiment agree moderately well for brittle materials, but not when theory is compared with measurements of mass lost from ductile materials. The discrepancy is shown to be attributable to the ability of ductile materials to deform plastically without fracturing.
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