Mechanisms and Theory of Indentation of Ice Plates
Abstract This study gives the results and interpretation of tests made in a cold room on ice plates held vertically in a press and indented at various speeds with a rectangular indentor. These plates, 81 cm square, were held and frozen solid to a steel frame to represent semi-infinite ice sheets. Th...
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Cambridge University Press (CUP)
1977
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Online Access: | http://dx.doi.org/10.1017/s002214300002935x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300002935X |
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crcambridgeupr:10.1017/s002214300002935x 2024-05-12T08:06:16+00:00 Mechanisms and Theory of Indentation of Ice Plates Michel, B. Toussaint, N. 1977 http://dx.doi.org/10.1017/s002214300002935x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300002935X en eng Cambridge University Press (CUP) Journal of Glaciology volume 19, issue 81, page 285-300 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1977 crcambridgeupr https://doi.org/10.1017/s002214300002935x 2024-04-18T06:54:41Z Abstract This study gives the results and interpretation of tests made in a cold room on ice plates held vertically in a press and indented at various speeds with a rectangular indentor. These plates, 81 cm square, were held and frozen solid to a steel frame to represent semi-infinite ice sheets. The tests were carried out at — 10°C with indentation speeds varying from 6 × 10 -5 cm/s to 3 cm/s. It was found that the nominal pressure of indentation varies as a function of loading rates in a manner similar to that of the strength of S 2 ice in uniaxial compression. The pressure increases rapidly with loading rates up to its maximum value at a strain-rate of 5 × 10 -4 S -1 . From there on, the pressure decreases. In the ductile range and up to the point of maximum pressure, a theoretical model was proposed where the theory of Hill (1950) of indentation of an ideal plastic body can be applied to predict an indentation pressure close to three times that of the uniaxial crushing strength. The tests did not show any so-called “ratio effect” caused by the ratio of the indentor width to the plane thickness. This effect could be explained by the influence of the geometry of the indentor on the strain-rate. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 19 81 285 300 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Michel, B. Toussaint, N. Mechanisms and Theory of Indentation of Ice Plates |
topic_facet |
Earth-Surface Processes |
description |
Abstract This study gives the results and interpretation of tests made in a cold room on ice plates held vertically in a press and indented at various speeds with a rectangular indentor. These plates, 81 cm square, were held and frozen solid to a steel frame to represent semi-infinite ice sheets. The tests were carried out at — 10°C with indentation speeds varying from 6 × 10 -5 cm/s to 3 cm/s. It was found that the nominal pressure of indentation varies as a function of loading rates in a manner similar to that of the strength of S 2 ice in uniaxial compression. The pressure increases rapidly with loading rates up to its maximum value at a strain-rate of 5 × 10 -4 S -1 . From there on, the pressure decreases. In the ductile range and up to the point of maximum pressure, a theoretical model was proposed where the theory of Hill (1950) of indentation of an ideal plastic body can be applied to predict an indentation pressure close to three times that of the uniaxial crushing strength. The tests did not show any so-called “ratio effect” caused by the ratio of the indentor width to the plane thickness. This effect could be explained by the influence of the geometry of the indentor on the strain-rate. |
format |
Article in Journal/Newspaper |
author |
Michel, B. Toussaint, N. |
author_facet |
Michel, B. Toussaint, N. |
author_sort |
Michel, B. |
title |
Mechanisms and Theory of Indentation of Ice Plates |
title_short |
Mechanisms and Theory of Indentation of Ice Plates |
title_full |
Mechanisms and Theory of Indentation of Ice Plates |
title_fullStr |
Mechanisms and Theory of Indentation of Ice Plates |
title_full_unstemmed |
Mechanisms and Theory of Indentation of Ice Plates |
title_sort |
mechanisms and theory of indentation of ice plates |
publisher |
Cambridge University Press (CUP) |
publishDate |
1977 |
url |
http://dx.doi.org/10.1017/s002214300002935x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300002935X |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 19, issue 81, page 285-300 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s002214300002935x |
container_title |
Journal of Glaciology |
container_volume |
19 |
container_issue |
81 |
container_start_page |
285 |
op_container_end_page |
300 |
_version_ |
1798848734251974656 |