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Direct Shear Tests on JSC-1A Lunar Regolith Simulant |
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| Authors: | Masafumi Iai Ronaldo Luna |
| Affiliation: | 1Research Engineer, Axelspace Corp., M & C Building 7F, 2-3-13 Kanda Ogawa-machi, Chiyoda-ku, Tokyo 101-0052, Japan; formerly, Graduate Research Assistant, Dept. of Geological Science and Engineering, Missouri Univ. of Science and Technology, Rolla, MO 65409. E-mail: iai@axelspace.com 2Professor, Dept. of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, Rolla, MO 65409 (corresponding author). E-mail: rluna@mst.edu |
| Abstract: | A series of direct shear tests were conducted on the JSC-1A lunar regolith simulant in a 101.6-mm- (4-in.-) diameter container. The direct shear test provides a unique mode of failure that aids the development of excavation tools for the Moon. Relative density and normal load were varied to study the strength behavior of such granular material at peak and critical state conditions. The values of the internal friction angle ranged from 30 to 70°. A relationship between the internal friction angle of the direct shear and the published triaxial compression test results is presented. Additionally, the measured dilatancy angle is related to the difference in peak and critical state stress friction angles. |
| Keywords: | Moon Simulation Shear tests Friction Dilatancy |