舱口角隅部分的疲劳问题是疲劳分析的重要内容。本文建立了某船的全船有限元模型并分别采用嵌入式模型和外部模型对舱口角隅进行细化。比较不同的单元类型、热点应力选取方式对疲劳损伤的影响。同时采用直接计算的谱分析方法计算了舱口角隅的疲劳损伤。发现当选用最大主应力作为热点应力时实体单元计算结果较壳单元偏小。同一类型单元节点数目的不同对损伤结果影响不大。热点应力选取方式对疲劳损伤的计算影响较大，在对舱口角隅疲劳强度进行分析时建议选用最大主应力插值的方式计算热点应力。
The fatigue problem of hatch corner is an important content of fatigue analysis. In this paper, the finite element model of a ship is established and the hatch corner is refined with embedded model and external model. The effects of different types of elements and hot spot stress on fatigue damage are compared. At the same time, the fatigue damage of hatch corner are calculated by the spectral analysis method of direct calculation. The calculation result of the solid element is smaller than the shell element when the maximum principal stress is used as the hot spot stress. The difference of the number of nodes in the same element type has little effect on the result of damage. Fatigue damage is affected by hot spot stress selection method. The calculation of hot spot stress by the method of maximum principal stress interpolation is proposed in the analysis of fatigue strength of hatch corner.
2017,39(5): 16-21 收稿日期：2016-09-05
DOI：10.3404/j.issn.1672-7619.2017.05.004
分类号：U663.2
作者简介：汪振禹(1990-),男,硕士研究生,主要从事环境载荷与结构强度研究
参考文献：
[1] 冯国庆. 船舶结构疲劳评估方法研究[D]. 哈尔滨:哈尔滨工程大学, 2003. FENG Guo-Qing. The fatigue assessment methods for ship structures[D]. Harbin:Harbin Engineering University, 2003.
[2] 程玉芹, 罗广恩. 超大型集装箱船上甲板舱口角隅疲劳强度评估[J]. 船海工程, 2013(1):24-27, 31. CHENG Yu-Qin, LUO Guang-En. Fatigue assessment of the upper deck hatch corners in very large vontainer ship[J]. Ship and Sea Engineering, 2013(1):24-27, 31.
[3] 冯国庆. 船舶结构疲劳强度评估方法研究[D]. 哈尔滨:哈尔滨工程大学, 2006. FENG Guo-qing. Resrarch on fatigue strength assessment methods of ship structures[D]. Harbin:Harbin Engineering University, 2006.
[4] 中国船级社. 船体结构疲劳强度指南[M]. 北京:人民交通出版社, 2014. China Classification Society. Guide of ship structures fatigue strength[M]. Beijing:China Communications Press, 2014.
[5] 刘文华, 张弛. 基于CSR中热点应力的散货船疲劳强度分析[J]. 上海造船, 2009(3):17-20, 41. LIU Wen-Hua, ZHANG Chi. Fatigue strength analysis of bulk carriers based on hot spot stress in CSR[J]. Shanghai Shipbuilding, 2009(3):17-20, 41.
[6] 唐明非, 许汀. 基于DNV规范的结构疲劳强度谱分析方法[J]. 船舶设计通讯, 2011(1):21-25. TANG Ming-fei, XU Ting, Spectrum analysis of structural fatigue strength based on DNV rules[J]. Ship Design Communication, 2011(1):21-25.
[7] 任慧龙, 刘洋, 冯国庆. HCSR规范疲劳筛选方法研究[J]. 船海工程, 2014(2):19-22. REN Hui-long, LIU Yang, FENG Guo-qing. Research on the HCSR fatigue screening Method[J]. Ship and Sea Engineering, 2014(2):19-22.
[8] 刘敬喜, 唐永生, 楼丹平. 大型LNG船典型节点疲劳寿命谱分析评估[J]. 海洋工程, 2010(3):86-90. LIU Jing-xi, TANG Yong-sheng, LOU Dan-ping. Fatigue strength assessment of typical spots in a large LNG based on spectral method[J]. Oceanographic Engineering, 2010(3):86-90.
[9] 胡毓仁, 李庆典, 陈伯真, 船舶与海洋工程结构疲劳可靠性分析[M]. 哈尔滨:哈尔滨工程大学出版社, 2012. HU Yu-ren, LI Qing-dian, CHEN Bo-zhen, Fatigue reliability analysis of ship and offshore structures[M]. Harbin:Harbin Engineering University Press, 2012.
