In situ thermal profiles and laboratory impact experiments on iceberg ice
A series of 40 impact tests was conducted on large right-circular cylinders (68.5 cm diameter and 25.7 cm thickness) of iceberg ice collected from an iceberg in Labrador. Temperature profiles were also obtained for the iceberg and the profiles exhibited differences associated with the probe location...
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ftnrccanada:oai:cisti-icist.nrc-cnrc.ca:cistinparc:8895653 2023-05-15T16:57:25+02:00 In situ thermal profiles and laboratory impact experiments on iceberg ice Gagnon, R. E. Gammon, P. H. 1997 text https://nrc-publications.canada.ca/eng/view/object/?id=5fcff91b-a2cc-49fe-bf67-9311c845a2b9 https://nrc-publications.canada.ca/fra/voir/objet/?id=5fcff91b-a2cc-49fe-bf67-9311c845a2b9 unknown Journal of Glaciology, Volume: 43, Issue: 145, Publication date: 1997, Pages: 569–582 report_number:IR-1998-05 article 1997 ftnrccanada 2021-09-01T06:18:58Z A series of 40 impact tests was conducted on large right-circular cylinders (68.5 cm diameter and 25.7 cm thickness) of iceberg ice collected from an iceberg in Labrador. Temperature profiles were also obtained for the iceberg and the profiles exhibited differences associated with the probe location. Temperatures as low as -15°C were measured at penetration depths of about 8 m. The impact specimens were confined at the perimeter and base by a rigid metallic ring and plate. A spherically terminated impactor, with center-mounted pressure transducer, was dropped on to the flat top surface of specimens from various heights and with various added masses. Impact velocity varied from 1.8 to 3.9 m/s; impactor mass varied from 155 to 510 kg and the ice-specimen temperature varied from -0.5° to -14.5°C. Peak center pressures averaged from about 25 MPa at the highest temperature to about 41 MPa at the lowest temperature, with the highest recorded pressure being 50 MPa. Crater volume increased with increasing impact energy, as expected; however, the specific energy of the ejected material was found to decrease as the energy of impact and crater volume increased. A mechanism for this observed behaviour is proposed. Peer reviewed: Yes NRC publication: Yes Article in Journal/Newspaper Journal of Glaciology National Research Council Canada: NRC Publications Archive Flat Top ENVELOPE(-137.387,-137.387,63.225,63.225) |
institution |
Open Polar |
collection |
National Research Council Canada: NRC Publications Archive |
op_collection_id |
ftnrccanada |
language |
unknown |
description |
A series of 40 impact tests was conducted on large right-circular cylinders (68.5 cm diameter and 25.7 cm thickness) of iceberg ice collected from an iceberg in Labrador. Temperature profiles were also obtained for the iceberg and the profiles exhibited differences associated with the probe location. Temperatures as low as -15°C were measured at penetration depths of about 8 m. The impact specimens were confined at the perimeter and base by a rigid metallic ring and plate. A spherically terminated impactor, with center-mounted pressure transducer, was dropped on to the flat top surface of specimens from various heights and with various added masses. Impact velocity varied from 1.8 to 3.9 m/s; impactor mass varied from 155 to 510 kg and the ice-specimen temperature varied from -0.5° to -14.5°C. Peak center pressures averaged from about 25 MPa at the highest temperature to about 41 MPa at the lowest temperature, with the highest recorded pressure being 50 MPa. Crater volume increased with increasing impact energy, as expected; however, the specific energy of the ejected material was found to decrease as the energy of impact and crater volume increased. A mechanism for this observed behaviour is proposed. Peer reviewed: Yes NRC publication: Yes |
format |
Article in Journal/Newspaper |
author |
Gagnon, R. E. Gammon, P. H. |
spellingShingle |
Gagnon, R. E. Gammon, P. H. In situ thermal profiles and laboratory impact experiments on iceberg ice |
author_facet |
Gagnon, R. E. Gammon, P. H. |
author_sort |
Gagnon, R. E. |
title |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_short |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_full |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_fullStr |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_full_unstemmed |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_sort |
in situ thermal profiles and laboratory impact experiments on iceberg ice |
publishDate |
1997 |
url |
https://nrc-publications.canada.ca/eng/view/object/?id=5fcff91b-a2cc-49fe-bf67-9311c845a2b9 https://nrc-publications.canada.ca/fra/voir/objet/?id=5fcff91b-a2cc-49fe-bf67-9311c845a2b9 |
long_lat |
ENVELOPE(-137.387,-137.387,63.225,63.225) |
geographic |
Flat Top |
geographic_facet |
Flat Top |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_relation |
Journal of Glaciology, Volume: 43, Issue: 145, Publication date: 1997, Pages: 569–582 report_number:IR-1998-05 |
_version_ |
1766048958559289344 |