Keywords and Phrases
Compaction; Dry granular materials; Grain size; Load indentation Test; Regolith; Space exploration
"The behavior of three granular materials; filter sand, crushed garnet, and shale cutting, were investigated in an effort to evaluate the effect of grain size and shape, and material compaction under single tool load-indentation test. Force-penetration data was collected continuously through the end of each test and specific energy and specific penetration was calculated from the data.
Grain size and compaction affected the force penetration behavior. The higher the grain size, the more the fluctuation in the force of penetration. In addition, compaction reduces the force fluctuation in the fine aggregate grains, but increases the magnitude of the force fluctuations in the coarse aggregate grains.
Specific energy SE (energy required to indent a unit volume of the material) and Specific penetration SP (maximum force required to indent the material a given depth) were computed from the force-penetration curve. SE correlated with grain size and Aspect ratio for uncompacted materials and correlated with grain size and bulk density for the compacted materials. SP correlated with grain size and aspect ratio of the uncompacted sample and correlated with grain size, bulk density and solid density when the compacted data was introduced. This indicates that for uncompacted materials, grain size and aspect ratio are the dominant variable affecting SP and SE. However, when compaction is introduced, grain size and bulk density become dominant"--Abstract, page iii.
Gertsch, Leslie S.
Maerz, Norbert H.
Rogers, J. David
Geosciences and Geological and Petroleum Engineering
M.S. in Geological Engineering
Missouri University of Science and Technology
xi, 97 pages
© 2014 Dennis Chieze Duru, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Granular materials -- Mechanical properties -- Mathematical models
Pattern formation (Physical sciences
Electronic OCLC #
Duru, Dennis Chieze, "Effects of grain properties and compaction on single-tool normal indentation of granular materials" (2014). Masters Theses. 7325.