AN ATTEMPT AT DEFORMATION TESTS OF DEEP ICE CORE SAMPLES CONTAINING CLOUDY BANDS

元データ 国立極地研究所

概要

We conducted detailed mechanical property investigations of deep polar ice core samples. In order to understand the effect of cloudy band structure on deformation of ice core samples, uniaxial compression tests were carried out by using the GRIP ice core containing cloudy bands. The uniaxial compression tests were performed under the conditions of constant strain rate (Type A) and constant load (Type B) at -15℃. The enhancement factor (Es) correlates with the schmid factor (F) that indicates c-axis orientation development with F less than 0.46. The Es of ice specimens with F larger than 0.46 showed large values (approximately 3 to 50) with significant data scatter. The straight lines were scratched on the surface of a few specimens and the changes of these line shapes were observed after compression tests. It is clearly shown that the specimens containing cloudy bands deform non-uniformly. Specimens with cloudy bands tend to deform easily, but there is no clear correlation between the Es and the number of cloudy bands.

著者

Watanabe Okitsugu National Institute of Polar Research, Research Organization of Information and Systems
Narita Hideki Institute of Low Temperature Science Pan-Okhotsk Research Center, Hokkaido University
宮本 淳 北海道大学低温科学研究所
Hondoh Takeo Institute of Low Temperature Science, Hokkaido University
Shoji Hitoshi Kitami Institute of Technology
Miyamoto Atsushi Kitami Institute of Technology
Watanabe O National Institute Of Polar Research Research Organization Of Information And Systems
Watanabe Okitsugu National Institute Of Polar Research
Narita Hideki Institute Of Low Temperature Science Pan-okhotsk Research Center Hokkaido University
Narita Hideki Institute Of Low Temperature Science Hokkaido University
Watanabe Okitsusgu National Institute of Polar Research
Hondoh Takeo Institute Of Low Temperature Science Hokkaido University
MIYAMOTO Atsushi Institute of Low Temperature Science, Hokkaido University
CLAUSEN Henrik Niels Bohr Institute, University of Copenhagen

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