摘要
浮式生产储油卸油船(FPSO)经历满载和卸载,油船试验和多变的波浪载荷,此时结构中较高的初始残余应力常常已被释放,很大程度上影响了此类结构疲劳强度估算准确性。应用三维弹塑性有限元方法模拟FPSO典型焊接接头的残余应力释放,并用试验数据进行验证。对结构在变幅循环载荷下的残余应力释放进行研究,得到相关的残余应力释放预报公式。从而为提高FPSO在实际载况下疲劳强度估算准确性提供有价值参考。
FPSOs often experience overall loading and offloading, oil tanker tests and various wave-induced loads, and high initial residual stresses are expected to cause the residual stresses relaxations, which affect the accuracy of fatigue strength calculation of these typical struc- tures to a great degree. Hence, in the paper, the residual stress relaxation of the typical weld joints of ~ is simulated with 3-D elastic- plastic finite element analysis; moreover, it is validated through experimental data. Mterwards, the residual stress relaxations under variable amplitude cyclic loadings are studied, and a relative prediction formula for residual stress relaxation is obtained. Consequently, some valuable references for better improving fatigue strength estimation of FPSOs under practical loading conditions are offered.
出处
《海洋工程》
CSCD
北大核心
2009年第2期46-53,共8页
The Ocean Engineering
基金
中国留学基金委和挪威研究理事会的资助项目
