摘要
极地船舶在冰区航行时,其船体结构所受冰载荷经常会出现逐渐加载之后断裂卸载,再逐渐加载的周期性特点。这种往复循环的冰载荷与极地的低温环境共同作用,会加剧船体结构的疲劳问题。由此,为了准确评估冰载荷引起的船体结构疲劳损伤,以一艘极地物探船为研究对象,采用有限元方法获得船体上的冰载荷曲线,通过线性转化和Goodman修正等方法将该载荷曲线转化为疲劳计算所需的应力循环,并基于S-N曲线和疲劳线性累计损伤理论对该极地物探船进行冰致疲劳损伤评估。计算结果表明:该极地物探船冰带区域的舷侧纵桁与横舱壁交界位置最易产生冰致疲劳,冰载荷引起的极地物探船冰带区域关键节点的疲劳损伤满足设计要求;冰载荷引起的极地船舶疲劳损伤不可忽略。
When a polar ship sails in an ice region,the ice loading on the hull structure often appears to be gradually loaded,then unloaded with ice broken,and then gradually loaded.This cyclic ice loading and the polar low temperature environment are likely to induce the fatigue problem of hull structure.Therefore,it is necessary to assess the fatigue damage of the hull structure caused by the ice loading.A polar geophysical prospecting ship is taken as the research object.The ice loading time history on the hull is obtained by the finite element method,and then the loading time history is converted into the stress cycles for fatigue calculation by methods such as linear conversion and Goodman correction.The ice-induced fatigue damage of polar geophysical prospecting ships is assessed based on S-N Curve and linear cumulative fatigue damage theory.It can provide reference for assessment of ice-induced fatigue of polar ships.
作者
王陈阳
罗广恩
郑远昊
潘广善
刘家奇
WANG Chenyang;LUO Guangen;ZHENG Yuanhao;PAN Guangshan;LIU Jiaqi(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,Jiangsu,China;China Ship Scientific Research Center,Wuxi 214082,Jiangsu,China)
出处
《船舶工程》
CSCD
北大核心
2022年第6期15-21,126,共8页
Ship Engineering
基金
工信部高技术船舶“极地十八缆物探船船型开发”资助项目
工信部高技术船舶“中高冰级极地船舶航行性能与结构安全性预报技术研究”资助项目
工信部高技术船舶“极地小型邮轮设计建造关键技术研究”项目。
关键词
极地船舶
冰载荷
数值模拟
冰致疲劳
有限元仿真
polar ship
ice loading
numerical calculation
fatigue induced by ice loading
finite element method