材料低温脆性对LNG船剩余极限强度的影响  

Effect of Low Temperature Brittleness on Residual Ultimate Strength of LNG Carrier

作　　者：李继中[1] 唐文勇[1] 

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240

出　　处：《船舶工程》2015年第6期22-26,共5页Ship Engineering

摘　　要：薄膜型LNG船在严重搁浅事故下存在破舱泄漏的可能,泄漏导致的低温会使船体结构发生脆性破坏。通过运用PCL语言对有限元软件Patran进行二次开发,自动迭代求解破舱后的结构温度场;结合船用钢低温下的材料特性,得出泄漏情况下的脆性影响范围;基于非线性有限元软件ABAQUS,假定脆性影响下的结构失去承载能力,计算了LNG船的剩余极限强度,通过与不考虑材料脆性下的结果进行对比,结果表明低温脆性对LNG船搁浅破舱情况下剩余极限强度有较大的减弱作用。Membrane LNG carriers may have the risk of leakage in severe grounding scenarios. The hull structure may suffer brittle fracture due to the low temperature. With the second development on the FEM platform Patran by PCL, the program is automatically iterative compute the structure thermal distribution after the tank damage. The brittleness affected zone is derived with reference to the material property of normal marine steel under low temperature. Based on the non-linear FEM software ABAQUS, the residual ultimate strength of the LNG carrier is calculated with the assumption of the structure lacking of the bearing ability due to the brittleness. By comparing the result with that of not taking the material brittleness into account, the result shows that the cryogenic brittleness has relatively large weakening effect on the residual ultimate strength under the condition that the LNG carrier meets with tank damage and stranded.

关 键 词：LNG船 破舱 低温脆性 剩余极限强度 PCL语言 非线性有限元法 

分 类 号：U661.43[交通运输工程—船舶及航道工程]