Numerical evaluation on fatigue crack growth and life predictions of an FPSO mooring system

被引：9

作者：

He, Wentao ^{[1
,2
]}

Cao, Shihui ^{[1
,2
]}

Hu, Zhiqiang ^{[3
]}

Xie, De ^{[4
]}

Zhang, Zhengyi ^{[4
]}

Wang, Changzi ^{[1
,2
]}

机构：

[1] Ocean Univ China, Coll Engn, Qingdao 266100, Peoples R China

[2] Ocean Univ China, Shandong Prov Key Lab Ocean Engn, Qingdao 266100, Peoples R China

[3] Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, England

[4] Huazhong Univ Sci & Technol, Sch Naval Architecture & Ocean Engn, Wuhan 430074, Hubei, Peoples R China

来源：

OCEAN ENGINEERING | 2022年 / 265卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Crack growth; Fatigue life prediction; Fracture mechanics -based approach; Crack morphology; Mooring chain; DAMAGE;

D O I：

10.1016/j.oceaneng.2022.112501

中图分类号：

U6 [水路运输]; P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

This study aims to systematically study the fatigue crack propagation characteristics of the mooring system for a floating production storage and offloading vessel (FPSO) through the fracture mechanics-based approach. The remaining fatigue life of the mooring lines is predicted by a self-integrated program through the simulation of the crack growth behavior. Additionally, parametric studies are performed to investigate the influence of initial crack status (location/size/shape) on mooring crack propagation characteristics. Results illustrate that the remaining fatigue life at the uppermost position of mooring lines at the wave-ward side is similar, which is approximately 178 years longer than that of mooring lines at the wave-back side. Fatigue issues are the severest in the crown region, where the critical fatigue life is about 49% of that in the bend region and 19.9% of that in the straight region. With the increase of the initial crack size and aspect ratio, the remaining fatigue life experiences a remarkable decrease with amplitudes up to 47.8% and 30.1% respectively. The integrated evaluation program is a promising tool for the damage tolerance design of mooring system due to the excellent capability in predicting the remaining fatigue life and charactering the crack growth behavior.

引用

页数：14

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