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発表 DEFORMATION OF ICE BLOCKS MODELING CONSOLIDATED LAYER OF DEFORMED SEA ICE

作成年度 2010年度
論文名 DEFORMATION OF ICE BLOCKS MODELING CONSOLIDATED LAYER OF DEFORMED SEA ICE
論文名(和訳)
論文副題
発表会 20th IAHR International Symposium on ice 2010
誌名(No./号数)
発表年月日 2010/06/14 ~ 2010/06/18
所属研究室/機関名 著者名(英名)
八戸工業大学竹内 貴弘(TAKEUCHI Takahiro)
寒冷沿岸域チーム木岡 信治(KIOKA Shinji)
抄録
Offshore structures in ice-covered sea areas are subject to loads due to sea ice movement. Among several types of sea ice、 deformed ice such as rubble ice and ridge ice impose larger loads than level sheet ice due to their larger thickness. Further、 the consolidated layer of deformed ice is more important in ice load estimation than the sail and keel parts due to its higher strength. Takeuchi et al. (20041)、 20062)) reported that ice loads in the ductile range impose larger loads than in the brittle range. This was verified by indoor tests using a consolidated layer model of deformed ice. However、 there is little information available on the creep properties of consolidated layers of deformed ice、 even though it has been reported that the thickness of the consolidated part is two to three times that of the surrounding level ice sheet (Timco and Goodrich; 1988) 3).[*]In the study、 creep tests were conducted using ice blocks to model the consolidated layer of deformed sea ice under constant loading in a cold room to observe the deformation in comparison with that of level sheet ice. The effects of normal stress and ice block size composing the consolidated layer were investigated under constant ice temperature. The applicability of Norton’s (Glen’s) law of secondary creep was also investigated.
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