文档介绍：第 19 卷第 4 期计算机辅助工程 Vol. 19 No. 4
2010 年 12 puter Aided Engineering Dec. 2010
文章编号1006 - 0871201004-0077-05
局部凹陷和偏心对接对海洋立管
疲劳寿命影响的数值分析
陈静, 谢小龙, 杨德庆
上海交通大学海洋工程国家重点实验室,上海 200030
摘要针对涡激振动导致的干涉碰撞及焊接时产生的偏心会降低海洋立管疲劳寿命的问题,用
S-N 法计算局部凹陷、偏心对接分别作用以及二者共同作用下海洋立管的疲劳寿命. 在偏移位置、
局部凹陷位置和过渡区域长度确定的情况下,偏移幅值和局部凹陷幅值越大,过渡区域的应力越
大,寿命越小在偏移幅值、局部凹陷幅值和过渡区域长度确定的情况下,过渡区域距海洋立管中部
越近对过渡区域的应力及寿命影响越大.
关键词海洋立管局部凹陷偏心对接疲劳寿命
中图分类号 P751 O346. 2 TB115 文献标志码 A
Numerical analysis on effect of local depression and
eccentric butt on marine riser fatigue life
CHEN Jing,XIE Xiaolong,YANG Deqing
State Key Lab. of Ocean Eng. ,Shanghai Jiaotong Univ. ,Shanghai 200030,China
Abstract As to the issues that marine riser fatigue life can be reduced by interference and collision
generated by vortex-induced vibration and weld-induced eccentricity,S-N method is used to calculate the
fatigue life of a marine riser under the effects of local depression and /or eccentric butt. When the
eccentricity location,local depression location and length of transition region are determined,the larger
amplitudes of eccentricity and local depression lead to the larger stress levels in the transition region and
shorter life. When the eccentricity amplitude,local depression amplitude and length of the transition
region are determined,the smaller distance between the transition region and middle part of mar