Measuring Static and Dynamic Properties of Frozen Silty Soils
A mechanical characterization of frozen silty soils has been conducted to support computer modeling of penetrators. The soils were obtained from the Eilson AFB (Alaska) vicinity. Quasi-static testing with a multiaxial system in a cold room and intermediate strain rate testing with a split Hopkinson...
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ftosti:oai:osti.gov:698 2023-07-30T04:06:19+02:00 Measuring Static and Dynamic Properties of Frozen Silty Soils Furnish, M.D. 2008-02-04 application/pdf http://www.osti.gov/servlets/purl/698 https://www.osti.gov/biblio/698 https://doi.org/10.2172/698 unknown http://www.osti.gov/servlets/purl/698 https://www.osti.gov/biblio/698 https://doi.org/10.2172/698 doi:10.2172/698 54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES SOIL MECHANICS PERMAFROST STRAIN RATE EARTH PENETRATORS COMPUTERIZED SIMULATION MECHANICAL TESTS 2008 ftosti https://doi.org/10.2172/698 2023-07-11T08:28:40Z A mechanical characterization of frozen silty soils has been conducted to support computer modeling of penetrators. The soils were obtained from the Eilson AFB (Alaska) vicinity. Quasi-static testing with a multiaxial system in a cold room and intermediate strain rate testing with a split Hopkinson pressure bar were conducted. Maximum stresses achieved were slightly above 1 GPa, apparently limiting the observed behavior primarily to elastic compression and pore crushing phenomena. Lower temperatures seem to increase the strength of the material markedly, although not by a simple factor. Lower temperatures and higher strain rates increase the apparent Young's and bulk moduli as well (an increase of {approximately} a factor of two is observed for strain rate increasing from 0.001 s{sup {minus}1} to 800 s{sup {minus}1}). The strength also depends strongly on strain rate. Increasing the strain rate from 0.001 {sup {minus}1} to 0.07 {sup {minus}1} increases the strength by a factor of five to ten (to values of order 1 GPa). However,only a small increase in strength is seen as strain rate is increased to {approximately} 10{sup 2}--10{sup 3} s{sup {minus}1}. The reliability of the strength measurements at strain rates< 1 s{sup {minus}1} is decreased due to details of the experimental geometry, although general trends are observable. A recipe is provided for a simulant soil based on bentonite, sand, clay-rich soil and water to fit the {approximately} 6% air-filled porosity, density and water content of the Alaska soils, based on benchtop mixing and jacketed compression testing of candidate mixes. Other/Unknown Material permafrost Alaska SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
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topic |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES SOIL MECHANICS PERMAFROST STRAIN RATE EARTH PENETRATORS COMPUTERIZED SIMULATION MECHANICAL TESTS |
spellingShingle |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES SOIL MECHANICS PERMAFROST STRAIN RATE EARTH PENETRATORS COMPUTERIZED SIMULATION MECHANICAL TESTS Furnish, M.D. Measuring Static and Dynamic Properties of Frozen Silty Soils |
topic_facet |
54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES SOIL MECHANICS PERMAFROST STRAIN RATE EARTH PENETRATORS COMPUTERIZED SIMULATION MECHANICAL TESTS |
description |
A mechanical characterization of frozen silty soils has been conducted to support computer modeling of penetrators. The soils were obtained from the Eilson AFB (Alaska) vicinity. Quasi-static testing with a multiaxial system in a cold room and intermediate strain rate testing with a split Hopkinson pressure bar were conducted. Maximum stresses achieved were slightly above 1 GPa, apparently limiting the observed behavior primarily to elastic compression and pore crushing phenomena. Lower temperatures seem to increase the strength of the material markedly, although not by a simple factor. Lower temperatures and higher strain rates increase the apparent Young's and bulk moduli as well (an increase of {approximately} a factor of two is observed for strain rate increasing from 0.001 s{sup {minus}1} to 800 s{sup {minus}1}). The strength also depends strongly on strain rate. Increasing the strain rate from 0.001 {sup {minus}1} to 0.07 {sup {minus}1} increases the strength by a factor of five to ten (to values of order 1 GPa). However,only a small increase in strength is seen as strain rate is increased to {approximately} 10{sup 2}--10{sup 3} s{sup {minus}1}. The reliability of the strength measurements at strain rates< 1 s{sup {minus}1} is decreased due to details of the experimental geometry, although general trends are observable. A recipe is provided for a simulant soil based on bentonite, sand, clay-rich soil and water to fit the {approximately} 6% air-filled porosity, density and water content of the Alaska soils, based on benchtop mixing and jacketed compression testing of candidate mixes. |
author |
Furnish, M.D. |
author_facet |
Furnish, M.D. |
author_sort |
Furnish, M.D. |
title |
Measuring Static and Dynamic Properties of Frozen Silty Soils |
title_short |
Measuring Static and Dynamic Properties of Frozen Silty Soils |
title_full |
Measuring Static and Dynamic Properties of Frozen Silty Soils |
title_fullStr |
Measuring Static and Dynamic Properties of Frozen Silty Soils |
title_full_unstemmed |
Measuring Static and Dynamic Properties of Frozen Silty Soils |
title_sort |
measuring static and dynamic properties of frozen silty soils |
publishDate |
2008 |
url |
http://www.osti.gov/servlets/purl/698 https://www.osti.gov/biblio/698 https://doi.org/10.2172/698 |
genre |
permafrost Alaska |
genre_facet |
permafrost Alaska |
op_relation |
http://www.osti.gov/servlets/purl/698 https://www.osti.gov/biblio/698 https://doi.org/10.2172/698 doi:10.2172/698 |
op_doi |
https://doi.org/10.2172/698 |
_version_ |
1772818859270602752 |