| 海冰韧脆转变特性的宏微观分析 |
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| 引用本文： | 李心清,秦大河,任贾文,周会.海冰韧脆转变特性的宏微观分析[J].冰川冻土,2000,22(1):48-52. |
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| 作者姓名： | 李心清 秦大河 任贾文 周会 |
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| 作者单位： | 大连理工大学工程力学系!辽宁大连116023(李洪升，岳前进，郑靖明)，中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室!甘肃 兰州 730000(朱元林) |
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| 摘 要： | 冰荷载是寒区海洋工程结构物设计的控制荷载。海冰强度研究是确定冰荷载的基础。从宏微观结合的角度研究海冰强度特性，通过对海冰韧脆转变的微观机制分析，给出了微裂纹形成机制和扩同制；通过对Ｒｉｃｅ－Ｔｈｏｍｓｏｎ模型的分析，得出了韧－脆转变的判据；最后进行了韧脆转变区的强度计算。与实验结果相符。
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| 关 键 词： | 海冰 强度 韧脆转变 宏微观分析 |
Macro-Microanalyses for Ductile-Brittle Transition on Sea Ice Strength |
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| LI Hong-sheng,YUE Qian-Jin,ZHENG Jing-ming,ZHU Yuan-lin.Macro-Microanalyses for Ductile-Brittle Transition on Sea Ice Strength[J].Journal of Glaciology and Geocryology,2000,22(1):48-52. |
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| Authors: | LI Hong-sheng YUE Qian-Jin ZHENG Jing-ming ZHU Yuan-lin |
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| Abstract: | Ice force is dominant for the offshore structures in ice covered region, and mechanical properties of ice are the main factors to determine the ice forces. The mechanical propeties of sea ice, a special solid material, depend on its crystal dimension, c-axes direction, anisotropy, temperature, stain-rate, stress-state and other factors. In the previous studies, some experimental models of sea ice strength were established. In this paper, sea ice strength was studied through a macroscopic and microscopic combination. which has the benefit to establish the theoretic model. and to describe the deformation law, the stress-strain relationship and the destroy criteria. Based on the physical process of ice-structure interaction, the mechanisms of formation and expansion of the micro-crack were presented through the microscopic mechanism analysis of sea ice ductile-brittle transition. The criterion of sea ice ductile-brittle transition was obtained by analyzing the Rice-Thomson model. The sea ice strength of the ductile-brittle transition zone calculated was accorded with the test result, which can be utilized to forecast the mechanical behaviors in the ice-structure interaction under general conditions, and to be theoretic foundation for the ice force design. |
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| Keywords: | sea ice strength ductile-brittle transition macroscopic and microscopic |
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