渤海海冰断裂韧度试验  

Experiments on sea ice fracture toughness in the Bohai Sea

作　　者：季顺迎[1] 刘宏亮[1] 许宁[2] 马红艳[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116023 [2]国家海洋环境监测中心,辽宁大连116024

出　　处：《水科学进展》2013年第3期386-391,共6页Advances in Water Science

基　　金：国家海洋公益性行业科研专项经费资助项目(201105016);国家自然科学基金资助项目(41176012)~~

摘　　要：海冰的断裂韧度是近海结构冰荷载分析的重要参数,也是影响海冰断裂、重叠和堆积等动力行为的主要力学特性。2011—2012年冬季现场采集了渤海莱州湾的海冰试样,在室内低温环境下通过三点弯曲试验测得了不同温度、盐度和加载速率下的海冰断裂韧度KIC。结果表明,卤水体积(温度和盐度)和加载速率对KIC的影响比较显著。随温度和加载速率的降低,KIC值均会增大,且与卤水体积的平方根呈负指数关系。为极限破坏状态下海冰的断裂过程和冰荷载分析的参数选用提供了依据。The fracture toughness of sea ice is an important parameter to analyze ice load on offshore structures,and also affects the sea ice dynamics,such as sea ice breakage,rafting and ridging,etc.In this study,sea ice samples were collected in the Liaodong Bay of Bohai Sea in the winter of 2011—2012.The values of sea ice fracture toughness KIC were tested under different ice temperatures,salinities and loading rates with bending tests of three loading points.The results show that the brine volume（as a function of sea ice temperature and salinity）,and the loading rate have obvious influences on the value of KIC.The value of KIC decreases with either increasing ice temperature or loading rate.It has a negative exponential relation with the square root of brine volume.The results of this study will be a reference to study the fracture process of sea ice cover under ultimate conditions,and can also be applied to analyze ice load on offshore structures.

关 键 词：海冰 断裂韧度 卤水体积 冰温 加载速率 

分 类 号：O346.1[理学—固体力学]