SHOCK TRANSMISSION THROUGH ICE AND SNOW.
During the summer of 1963, twenty-six 32-pound and twenty-one 10-pound spherical TNT charges were detonated at depths varying from 9.5 feet below to 9.5 feet above the snow surface near Camp Century on the Greenland Ice Cap. Airblast pressure-time measurements were made to determine pressure loading...
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ftdtic:AD0659774 2023-05-15T16:28:15+02:00 SHOCK TRANSMISSION THROUGH ICE AND SNOW. Joachim,Charles E. ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS 1967-09 text/html http://www.dtic.mil/docs/citations/AD0659774 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0659774 en eng http://www.dtic.mil/docs/citations/AD0659774 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost Explosions (*SHOCK WAVES *WAVE PROPAGATION) (*EXPLOSIVES *BLAST) ICE GREENLAND TNT DETONATIONS ATTENUATION ACCELERATION Text 1967 ftdtic 2016-02-18T20:29:59Z During the summer of 1963, twenty-six 32-pound and twenty-one 10-pound spherical TNT charges were detonated at depths varying from 9.5 feet below to 9.5 feet above the snow surface near Camp Century on the Greenland Ice Cap. Airblast pressure-time measurements were made to determine pressure loadings on the snow surface, and acceleration-time measurements were made to determine near-surface snow motion, particularly the late-arriving motion. Detonation of multiple shots on the same gage array caused compaction of the near-surface snow. The increase in snow density resulted in higher amplitude motions on succeeding shots. The shock wave generated by an explosive source at or above the snow surface attenuates very rapidly to a depth of 5 feet. Peak vertical downward accelerations from gages at a 2.0-foot depth of burial are three to four times greater than accelerations from gages at a 5.0-foot depth. Below a 5.0-foot depth the data indicate a much smaller decrease of peak vertical downward acceleration with depth. A typical acceleration-time history shows the airblast-induced motion arriving first, followed by the refracted airblast-induced shock. After passage of these waves comes a relatively long-duration (20-60 msec) downward acceleration of approximately 1 g, followed by a bottoming action or an abrupt apparent upward acceleration, i.e. the abrupt coming to rest of the accelerometer. Text Greenland Ice Ice cap permafrost Defense Technical Information Center: DTIC Technical Reports database Gage ENVELOPE(-118.503,-118.503,56.133,56.133) Greenland |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost Explosions (*SHOCK WAVES *WAVE PROPAGATION) (*EXPLOSIVES *BLAST) ICE GREENLAND TNT DETONATIONS ATTENUATION ACCELERATION |
spellingShingle |
Snow Ice and Permafrost Explosions (*SHOCK WAVES *WAVE PROPAGATION) (*EXPLOSIVES *BLAST) ICE GREENLAND TNT DETONATIONS ATTENUATION ACCELERATION Joachim,Charles E. SHOCK TRANSMISSION THROUGH ICE AND SNOW. |
topic_facet |
Snow Ice and Permafrost Explosions (*SHOCK WAVES *WAVE PROPAGATION) (*EXPLOSIVES *BLAST) ICE GREENLAND TNT DETONATIONS ATTENUATION ACCELERATION |
description |
During the summer of 1963, twenty-six 32-pound and twenty-one 10-pound spherical TNT charges were detonated at depths varying from 9.5 feet below to 9.5 feet above the snow surface near Camp Century on the Greenland Ice Cap. Airblast pressure-time measurements were made to determine pressure loadings on the snow surface, and acceleration-time measurements were made to determine near-surface snow motion, particularly the late-arriving motion. Detonation of multiple shots on the same gage array caused compaction of the near-surface snow. The increase in snow density resulted in higher amplitude motions on succeeding shots. The shock wave generated by an explosive source at or above the snow surface attenuates very rapidly to a depth of 5 feet. Peak vertical downward accelerations from gages at a 2.0-foot depth of burial are three to four times greater than accelerations from gages at a 5.0-foot depth. Below a 5.0-foot depth the data indicate a much smaller decrease of peak vertical downward acceleration with depth. A typical acceleration-time history shows the airblast-induced motion arriving first, followed by the refracted airblast-induced shock. After passage of these waves comes a relatively long-duration (20-60 msec) downward acceleration of approximately 1 g, followed by a bottoming action or an abrupt apparent upward acceleration, i.e. the abrupt coming to rest of the accelerometer. |
author2 |
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS |
format |
Text |
author |
Joachim,Charles E. |
author_facet |
Joachim,Charles E. |
author_sort |
Joachim,Charles E. |
title |
SHOCK TRANSMISSION THROUGH ICE AND SNOW. |
title_short |
SHOCK TRANSMISSION THROUGH ICE AND SNOW. |
title_full |
SHOCK TRANSMISSION THROUGH ICE AND SNOW. |
title_fullStr |
SHOCK TRANSMISSION THROUGH ICE AND SNOW. |
title_full_unstemmed |
SHOCK TRANSMISSION THROUGH ICE AND SNOW. |
title_sort |
shock transmission through ice and snow. |
publishDate |
1967 |
url |
http://www.dtic.mil/docs/citations/AD0659774 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0659774 |
long_lat |
ENVELOPE(-118.503,-118.503,56.133,56.133) |
geographic |
Gage Greenland |
geographic_facet |
Gage Greenland |
genre |
Greenland Ice Ice cap permafrost |
genre_facet |
Greenland Ice Ice cap permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0659774 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766017877318565888 |