Variable Contributions to Shear Strength Reduction for Percussive Excavation in Lunar Regolith Simulant

Details Variable Contributions to Shear Strength Reduction for Percussive Excavation in Lunar Regolith Simulant Variable Contributions to Shear Strength Reduction for Percussive Excavation in Lunar Regolith Simulant

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p13d1740g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P13D-1740

Statistics

Computation

[0599] Computational Geophysics / General Or Miscellaneous, [0999] Exploration Geophysics / General Or Miscellaneous

Scientific paper

Computer generated robotic mobility modeling is an essential tool for future design. A critical part of that design tool is the empirical data to be used to corroborate and validate numeric models. Recently, Honeybee Robotics performed extensive testing to document how different variables change the effectiveness of percussive excavation in lunar simulant JSC1A. This test data will be used in future work to help develop a physically based discrete element model (DEM). The DEM will in turn be means by which engineers can theoretically predict interaction forces associated with different excavation devices in lunar regolith. Earlier work has already shown that percussive excavation has a dramatic effect on reducing the shear strength of dry granular soils, including lunar regolith JSC 1A. The purpose of this current research is to thoroughly study the variables involved in percussive excavation and determine to what degree each of those variables contribute to the shear strength reduction. The variables studied in this work include: frequency of percussion, magnitude of percussive impact energy, angle of excavation and applied percussion, speed of excavation, depth of excavation, relative soil density, and environmental pressure during excavation.

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