| HAN Hongwei,LI Zhijun,HUANG Wenfeng,LU Peng,LEI Ruibo. 2015. The uniaxial compressive strength of the Arctic summer sea ice. Acta Oceanologica Sinica, 34(1):129－136 |
| The uniaxial compressive strength of the Arctic summer sea ice |
| 北极夏季海冰单轴抗压强度研究 |
| Received:April 01, 2014 Revised:August 29, 2014 |
| DOI：10.1007/s13131-015-0598-7 |
| Key words:Arctic sea ice compressive strength porosity density temperature |
| 中文关键词: 北极海冰 压缩强度 孔隙率 密度 温度 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41376186; the Public Science and Technology Research Funds Projects of Ocean, State Oceanic Administration of China under contract No. 201205007; the High Technology of Ship Research Project of the Ministry of Industry and Information Technology of China under contract No. 2013417-01; the International Science and Technology Cooperation Program of China under contract No. 2011dFA22260; the International Science and Technology Cooperation Program of the Chinese Arctic and Antarctic Administration, State Oceanic Administration of China under contract No. IC201209. |
| Author Name | Affiliation | E-mail | | HAN Hongwei | State Key Laboratory of Coastal and Offshore Engineering, dalian University of Technology, dalian 116024, China | hhw777@sina.com | | LI Zhijun | State Key Laboratory of Coastal and Offshore Engineering, dalian University of Technology, dalian 116024, China | | | HUANG Wenfeng | School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China | | | LU Peng | State Key Laboratory of Coastal and Offshore Engineering, dalian University of Technology, dalian 116024, China | | | LEI Ruibo | Polar Research Institute of China, State Oceanic Administration, Shanghai 200136, China | |
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| Abstract: |
| The results on the uniaxial compressive strength of Arctic summer sea ice are presented based on the samples collected during the fifth Chinese National Arctic Research Expedition in 2012 (CHINARE-2012). Experimental studies were carried out at different testing temperatures (-3, -6 and -9℃), and vertical samples were loaded at stress rates ranging from 0.001 to 1 MPa/s. The temperature, density, and salinity of the ice were measured to calculate the total porosity of the ice. In order to study the effects of the total porosity and the density on the uniaxial compressive strength, the measured strengths for a narrow range of stress rates from 0.01 to 0.03 MPa/s were analyzed. The results show that the uniaxial compressive strength decreases linearly with increasing total porosity, and when the density was lower than 0.86 g/cm3, the uniaxial compressive strength increases in a power-law manner with density. The uniaxial compressive behavior of the Arctic summer sea ice is sensitive to the loading rate, and the peak uniaxial compressive strength is reached in the brittle-ductile transition range. The dependence of the strength on the temperature shows that the calculated average strength in the brittle-ductile transition range, which was considered as the peak uniaxial compressive strength, increases steadily in the temperature range from -3 to -9℃. |
| 中文摘要: |
| 基于中国第五次北极科学考察期间对北极夏季海冰的单轴压缩试验研究, 分析了北极夏季海冰单轴压缩强度变化规律. 单轴压缩试验采用垂直试样, 在不同试验温度(-3, -6 和 -9℃)和加载速率(0.001-1.000 MPa/s)下测试单轴压缩强度;同时测量每个力学试样的温度、密度和盐度用于计算海冰的孔隙率. 在0.01 - 0.03 MPa/s加载速率区间内分析海冰孔隙率和密度对单轴压缩强度的影响规律. 结果表明, 随着海冰孔隙率的增大, 单轴压缩强度呈线性降低趋势;在海冰密度小于0.86 g/cm3时, 海冰单轴压缩强度随着海冰密度的增大呈幂函数增长趋势. 海冰的单轴压缩性质对加载速率敏感, 在韧脆转变区海冰单轴压缩强度达到极大值. 计算不同温度下的韧脆转变区内的平均单轴压缩强度用于分析海冰单轴压缩强度对温度变化的响应. 结果表明, 随着温度的降低单轴压缩强度极大值存在逐渐增大趋势. |
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