文档介绍：中国农业大学学报
2006, 11( 4) : 89 93
Journal of China Agricultural U niversity
带环向表面裂纹海洋管道的断裂计算与可靠性评估
李杰
秦太验
( 中国农业大学理学院, 北京 100083)
摘
要
针对带环向表面裂纹海洋石油管道断裂可靠性问题, 利用权函数方法, 给出了计算裂纹前沿应力强度因
子的积分表达式, 进而导出了能满足工程精度要求的应力强度因子的实用计算公式。采用极限分析方法建立了带
裂纹海洋石油管道断裂可靠性评估模型, 给出了断裂失效概率和可靠度的计算公式。典型算例数值计算结果表
明: 应力强度因子随裂纹深度和长度的增大而增大, 这与
应力强度因子手册
( 科学出版社) 的结果一致; 当弯矩不
变, 裂纹深度和长度、管道壁厚和半径, 及轴力为随机变量时, 带裂纹海洋管道的可靠度随轴力均值的增大而减小。
关键词
海洋管道; 权函数法; 应力强度因子; 断裂可靠性
中图分类号
O 346
1; T E 973
1
文章编号
1007 4333( 2006) 04 0089 05
文献标识码
A
Fracture and reliability assessment on submarine pipelines
with circumferential surface cracks
Li Jie, Qin Taiyan
( College of Sciences, China Agricultural University, Beijing 100083, China)
Abstract
Using the we ight function method, the fracture o f a subma rine pipe line with circumferential s urfac e crac ks is
studied. A pra ctical fo rmula for ev alua ting the stress intens ity factors is derive d, which is impo rtant in oc ean e ng inee r-
ing. Base d o n the solutio ns o f s tress intensity fa cto rs a nd statistical mo dels of unce rta inties, a relia bility ass essment
me tho d fo r subma rine pipelines with surface c ra cks is propose d and puta tional fo rmula for predicting the proba bil-i
ty o f fra cture is g ive n. Finally, a typical numeric al exa mple is prese nted to illustra te the propos ed method. The re sults
show that the