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

• Main Authors: ミヤモト アツシ, ショウジ ヒトシ, ナリタ ヒデキ, ワタナベ オキツグ, / ホンドウ タケオ, Atsushi MIYAMOTO, Hitoshi SHOJI, Hideki NARITA, Okitsugu WATANABE, Henrik B. CLAUSEN, Takeo HONDOH
• Format: Report
• Language: English
• Published: Institute of Low Temperature Science, Hokkaido University 1997
• Subjects: ice core; Polar meteorology and glaciology; Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3972; http://id.nii.ac.jp/1291/00003972/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3972&item_no=1&attribute_id=18&file_no=1

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.