Computer Science
Scientific paper
Dec 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971moon....3..337j&link_type=abstract
The Moon, Volume 3, Issue 3, pp.337-345
Computer Science
2
Scientific paper
Bearing load vs penetration curves have been measured on a 1.3 g sample of lunar soil from the scoop of the Surveyor 3 soil mechanics surface sampler, using a circular indentor 2 mm in diameter. Measurements were made in an Earth laboratory, in air. This sample provided a unique opportunity to evaluate earlier, remotely controlled, in-situ measurements of lunar surface bearing properties. Bearing capacity, measured at a penetration equal to the indentor diameter, varied from 0.02 0.04 N cm-2 at bulk densities of 1.15 g cm-3 to 30-100 N cm-2 at 1.9 g cm-3. Deformation was by compression directly below the indentor at bulk densities below 1.61 g cm-3, by outward displacement at bulk densities over 1.62 g cm-3. Preliminary comparison of in-situ remote measurements with those on returned material indicates good agreement if the lunar regolith at Surveyor 3 has a bulk density of 1.6 g cm-3 at 2.5 cm. depth; definitive comparison awaits both better data on bulk density of the undisturbed lunar soil and additional mechanical-property measurements on returned material.
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