大型集装箱船高强度钢甲板裂纹缺陷的安全寿命评估.pdf

第18卷第5期
船舶力学
Vol.8 No
2014年5月
Journal of Ship Mechanic
May 2014
文章编号:1(007-7294(2014)05-0540-10
大型集装箱船高强度钢甲板裂纹
缺陷的安全寿命评佔
张鼎,2,黄小平,丁仕风3,洪英3,徐博文3
(1上海交通大学海洋工程国家重点实验室,上海200240;2中国船舶及海洋工程设计研究院,上海20001
3中国船级社上海规范研究所,上海200135)
摘要:文章根据船级社规范的疲劳校核应力计算方法及应力范同长期分布的基本特征,采用等效应力法将船舶
受到的外载荷转换为等幅疲劳载荷。将失效评估图技术和疲劳裂纹扩展计算方法结合起米,探讨复载荷作用
下集装箱船高强度钢甲板安全寿命评估方法,并考虑焊接残余应力的影啊。对某大型集装箱船上甲板焊接接头
焊趾处裂纹缺陷在复杂载荷作用下的疲劳寿命进行了评估,其中考虑了表面裂纹缺陷和坶藏裂纹缺陷两种情
况。结果表明,初始裂纹的尺寸大小对裂纹扩展影响显著,且在相同的初始裂纹尺寸和外载荷条件下,表面疲劳
裂纹对结构安全的危害性比内部的埋藏裂纹危害性更大。
关键词:高强度厚钢板;失效评估图技术;裂纹缺陷;单一曲线模型;应力范;寿命评估
中图分类号:U661.4
文献标识码:
doi:10.3969/.issa.1007-7294.2014.05.008
Security life assessment of crack flaws in high
tensile steel deck of large container ships
ZHANG Ding, HUA NG Xiao-ping, D/NG Shi-feng, HONG Ying, XU Bo-ucen
(1 State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, hina; 2 Marine Design &Research
Institute of China, Shanghai 20001 I, China; 3 Shanghai Rules Research Institute, CCS, Shanghai 200135, China)
Abstract The fatigue loading is obtained based on the classification society rules and Weibull long-term
checking stress range distribution. Equivalent stress method is used to transform random loading spectrum
into constant loading spectrum. A procedure which consists of FAD technology and crack growth life pre
diction method is used to assess the seeurity life of high tensile thick steel plates under complex loading
conditions. Fatigue life of a surface crack and an embedded crack located at butt welded joint in the upper
deck of a large container ship under complex loading conditions, considering the effect of welded residu
al stress, are assessed respectively. It is concluded that the initial size of crack has significant effect on crack
growth behavior and the harmfulness of surface crack on structural security is more serious than that of em
bedded crack in conditions of the same initial crack size and applied load
Key words: high tensile thick steel plates; FAD(failure assessment diagram)technology; crack flaws;
unique curve model; stress range; life assessment
收稿日期:2013-06-20
基金项日:海洋工程国家重点实验室某金项日(GKZD010053-17)
作者简介:张鼎(1986-),男,上海交通大学倾士研究生,E-mail:zhangding(@sjtu.edu.cn;
黄小平(1963-),男,博士,上海交通大学教授。