辽东湾粒状海冰弯曲力学行为试验研究  

Experimental study on bending mechanical behaviors of granular sea ice in the Liaodong Bay

作　　者：修苑人 李志军[1] 王庆凯[1] 韩红卫 XIU Yuanren;LI Zhijun;WANG Qingkai;HAN Hongwei(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;School of Water Conservancy and Civil Engineering,Northeast Agriculture University,Harbin 150030,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]东北农业大学水利与土木工程学院,黑龙江哈尔滨150030

出　　处：《海洋通报》2023年第6期667-676,共10页Marine Science Bulletin

基　　金：国家重点研发计划项目(2018YFA0605903);国家自然科学基金(41906198,52192692);中央高校基本科研业务(DUT21RC3086)。

摘　　要：弯曲破坏是冰与船舶或锥形海洋结构物相互作用时经常发生的一种冰破坏模式。全球变暖延长了渤海海冰的冻结期,导致冰层中粒状冰的比例呈增加趋势。为了更好地理解渤海粒状海冰的弯曲力学行为,使用2010-2011年冬季在辽东湾收集的粒状海冰进行了实验室三点弯曲试验。在−5℃、−10℃和−15℃条件下,共测试了42个海冰试样,应变速率范围为1×10^(−6)~6×10^(−4)/s,加载方向垂直于原始冰面。在试验过程中,测量每个冰试样的盐度和密度以计算孔隙率。试验分别给出了弯曲强度和有效弹性模量关于孔隙率的参数化关系,归一化后,弯曲强度在整个应变速率范围内没有速率依赖性。相比之下,有效弹性模量随着应变速率的增大而增大。以孔隙率和应变速率为因子,建立了冰试样有效弹性模量的参数化方程。Bending failure is an ice failure mode that often occurs when ice interacts with ships and conical marine structures.Global warming prolonged the freezing period of sea ice in the Bohai Sea,resulting in an increasing proportion of granular ice in ice sheets.In order to better understand the bending mechanical behavior of granular sea ice in the Bohai Sea,laboratory three-point bending tests were conducted using granular sea ice sampled in the Liaodong Bay in the winter of 2010-2011.A total of 42 sea ice specimens were tested at−5℃,−10℃and−15℃.The strain rate range was 1×10^(−6)~6×10^(−4)/s,and the loading direction was perpendicular to the initial ice surface.During the test,measured the salinity and density of each ice specimen to calculate the porosity.The parametric relationships between flexural strength and effective elastic modulus with respect to porosity are given respectively by tests.After normalization,the flexural strength has no rate dependence in the whole strain rate range.In contrast,the effective elastic modulus increases with the increase of strain rate.Taking porosity and strain rate as factors,the parametric equation of effective elastic modulus of the ice sample is established.

关 键 词：海冰 弯曲强度 有效弹性模量 孔隙率 应变速率 试验研究 

分 类 号：P731.15[天文地球—海洋科学]