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  • 1
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    Soil mechanics experiment (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Lunar soil mechanics and properties based on Apollo 14 observations and data
    Keywords: SPACE SCIENCES
    Type: APOLLO 14 PRELIM. SCI. REPT. 1971; P 87-108
    Format: text
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  • 2
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    Apollo 16 special samples, part B (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Information is presented concerning special samples which were collected for specific investigations. The methods of sample collection are described along with fillet and core samples.
    Keywords: SPACE SCIENCES
    Type: Apollo 16 Prelim. Sci. Rept.; 31 p
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  • 3
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    Soil mechanics experiment (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: The Apollo 15 soil-mechanics experiment has offered greater opportunity for study of the mechanical properties of the lunar soil than previous missions, not only because of the extended lunar-surface stay time and enhanced mobility provided by the lunar roving vehicle (rover), but also because four new data sources were available for the first time. These sources were: (1) the self-recording penetrometer (SRP), (2) new, larger diameter, thin-walled core tubes, (3) the rover, and (4) the Apollo lunar-surface drill (ALSD). These data sources have provided the best bases for quantitative analyses thus far available in the Apollo Program.
    Keywords: SPACE SCIENCES
    Type: Apollo 15 Prelim. Sci. Rept. e; 28 p
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  • 4
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    Soil mechanics (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Preliminary results are presented of an investigation of the physical and mechanical properties of lunar soil on the Descartes slopes, and the Cayley Plains in the vicinity of the LM for Apollo 16. The soil mechanics data were derived form (1) crew commentary and debriefings, (2) television, (3) lunar surface photography, (4) performance data and observations of interactions between soil and lunar roving vehicle, (5) drive-tube and deep drill samples, (6) sample characteristics, and (7) measurements using the SRP. The general characteristics, stratigraphy and variability are described along with the core samples, penetrometer test results, density, porosity and strength.
    Keywords: SPACE SCIENCES
    Type: Apollo 16 Prelim. Sci. Rept.; 29 p
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  • 5
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    Soil mechanics (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The soil mechanics experiment on the Apollo 17 mission to the Taurus-Littrow area of the moon is discussed. The objectives of the experiment were to determine the physical characteristics and mechanical properties of the lunar soil at the surface and subsurface in lateral directions. Data obtained on the lunar surface in conjunction with observations of returned samples of lunar soil are used to determine in-place density and porosity profiles and to determine strength characteristics on local and regional scales.
    Keywords: SPACE SCIENCES
    Type: NASA. Johnson Space Center Apollo 17 Prelim. Sci. Rept.; 22 p
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  • 6
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    Apollo 12 soil mechanics investigation (1971)
    In:  CASI
    Details
    Publication Date: 2006-08-20
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Calif. Univ. Res. in the Space Sci., v. 2; 24 p
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  • 7
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    Apollo drill core depth relationships (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Preliminary depth relationships are presented for the Apollo 15, 16, and 17 drill core samples. For a given depth in any of these drill stems, the in situ lunar surface depth can be estimated. Ranges of uncertainty are also established, based on percent core recovery and degree of sample disturbance. The most likely explanation for the sample disturbance observed in the top three sections of the Apollo 16 drill stem is sample migration after the stem was capped on the lunar surface; essentially no sample was lost. Similar disturbance occurred in the Apollo 17 drill core, although to a lesser degree. The average original bulk densities (i.e., before any disturbance occurred) of the Apollo 15, 16, and 17 drill cores are 1.76, 1.59, and 1.87 g/cu cm, respectively. The Apollo 15 and 17 values are probably close to the in situ values; but the Apollo 16 average in situ density could be as much as 13% less than the already low density in the drill core.
    Keywords: SPACE SCIENCES
    Type: The Moon; 10; June 197
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  • 8
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    Lunar soil grain size distribution (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A comprehensive review has been made of the currently available data for lunar grain size distributions. It has been concluded that there is little or no statistical difference among the large majority of the soil samples from the Apollo 11, 12, 14, and 15 missions. The grain size distribution for these soils has reached a steady state in which the comminution processes are balanced by the aggregation processes. The median particle size for the steady-state soil is 40 to 130 microns. The predictions of lunar grain size distributions based on the Surveyor television photographs have been found to be quantitatively in error and qualitatively misleading.
    Keywords: SPACE SCIENCES
    Type: The Moon; 6; Mar
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  • 9
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    Soil mechanics on the Moon, Mars, and Mulberry (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: From a soil mechanics point of view, the Moon is a relatively simple place. Without any water, organics, or clay minerals, the geotechnical properties of the lunar soil are confined to a fairly limited range. Furthermore, the major soil-forming agent is meteorite impact, which breaks the big particles into little particles; and simultaneously, cements the little particles back together again with molten glass. After about a hundred million years of exposure to meteorite impact, the distribution of particle sizes in the soil achieves a sort of steady state. The majority of the returned lunar soil samples have been found to be well-graded silty-sand to sandy-silt (SM in the Unified Soil Classification System). Each of the particle size distributions plots within a relatively narrow band, which appears to be uniform over the entire lunar surface. This further restricts the range of physical properties of the lunar surface. In contrast, Martian soils should exhibit an extremely wide range of properties. We already know that there is a small amount of water in the soil, greater than in the Martian atmosphere. Furthermore, the soil is suspected to be smectitic clay. That makes two out of the three factors that greatly affect the properties of terrestrial soils.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., Workshop on Mars Sample Return Science; p 55-56
    Format: application/pdf
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  • 10
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    The feasibility of processes for the production of oxygen on the moon (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An evaluation of the perceived feasibility of 20 different processs for the production of oxygen on the moon is presented. Many of them are largely untested and/or extremely complicated and difficult to implement. Simplicity, low energy, easily attainable feedstock, and resupply mass are the principal criteria for the processes that will ultimately be selected for the initial production of oxygen on the moon. An evaluation of the 20 processes resulted in a ranking according to overall feasibility. The eight processes considered to be the most likely candidates, at this time, for oxygen production on the moon are: ilmenite reduction of H2, CO2, and CH4; glass reduction with H2; molten silicate electrolysis; fluxed molten silicate electrolysis; vapor pyrolysis; and ion plasma pyrolysis.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: In: Engineering, construction, and operations in space - III: Space '92; Proceedings of the 3rd International Conference, Denver, CO, May 31-June 4, 1992. Vol. 1 (A93-41976 17-12); p. 752-762.
    Format: text
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