上海交通大学学报

上海交通大学学报（自然版）

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超低温作用下船体局部结构非线性响应

丁仕风1，2，唐文勇1，张圣坤1
  

  1. (1. 上海交通大学 海洋工程国家重点实验室， 上海 200030；2. 中国船级社 上海规范所， 上海 200135)
  • 收稿日期:2009-09-30 修回日期:1900-01-01 出版日期:2010-10-31 发布日期:2010-10-31

Nonlinear Response of Partial Ship Structure Caused by Ultralow emperature

  1. DING Shifeng1，2,TANG Wenyong1,ZHANG Shengkun1
  • Received:2009-09-30 Revised:1900-01-01 Online:2010-10-31 Published:2010-10-31

摘要： 针对液化天然气船在近40年的服役期中，极有可能出现箱体损坏、珍珠岩泄漏、绝热层局部失效的情况，假定了3种典型液化天然气（LNG）船局部结构受超低温作用时的事故模型，考虑材料特性随温度的变化，基于非线性分析方法采用MARC软件对事故工况下结构响应进行模拟分析，并进一步研究了影响结构超低温响应的主要因素，在此基础上探讨了降低事故危害的理论方法.

关键词: 液化天然气船, 非线性响应, 热应力

Abstract: (1. State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200030, China;
2. Shanghai Rules and Research Institute, China Classification Society, Shanghai 200135, China)
The insulation of liquefied natural gas (LNG) carrier is wooden boxes filled with perlite and thin steel plate. The property of wood is not very stable. During 40 years of ship’s enlistment, all loads act on the insulation. The boxes would be destroyed and perlite powder would leak out. Then the LNG pressure can pierce through the thin steel plate easily. As a result, ultralow temperature would act on ship structure immediately. So three possible accident models were assumed for that problem. Considering material property changes with temperature, a research on the nonlinear response of partial structure of LNG carrier was conducted by using MARC software. Then the action of heat capacity on structure response was studied and a theoretical design of structure protection was proposed.
Key words： liquefied natural gas (LNG) carrier; nonlinear response; thermal

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