摘要
以某冰区海洋导管架平台为研究对象,提出基于子模型技术的应力强度因子计算公式和步骤;建立了含裂纹管节点的有限元模型;提出用4种不同厚度的碳纤维增强复合材料(CFRP)片修复含裂纹管节点的有限元模型,并对修复效果进行了仿真分析与评估。仿真研究得出如下结论:(1)采用CFRP片修复平台含裂纹的管节点,裂纹尖端的应力强度因子以及平台管节点极限冰载荷都有较大变化,当CFRP片厚度为3mm时,等效应力强度因子减小58.01%以上,极限冰载荷增加95.83%,而当CFRP片厚度为6mm时,等效应力强度因子减小66.68%,极限冰载荷增加134.70%;(2)随着CFRP片厚度的增加,应力强度因子的减小,使胶层力学性能成为影响CFRP片修复平台管节点裂纹的一个"瓶颈"。
This paper studies the CFRP-based repair effect for cracked tubular joint of offshore platforms by finite element simulation. Taking a jacket platform in ice region as an example, a method computing the stress intensity factor (SIF) at the crack tip on complicated structures is presented. An analysis model with a surface crack is established, on which submodelling technique is used to define the singular elements around the crack tip. Before-repaired and after-repaired SIFs are calculated by a displacement interpolation method. The repair effect on 4 different CFRP laminates thickness is analyzed in this paper. The results show that when the thickness is 3 mm, the equivalent SIF at the crack tip decreases by more than 58.01%, the ultimate ice load of tubular joint of the offshore platform increases by 95.83%, while with the thickness increasing, the decreasing extent of SIF and the increasing extent of ultimate ice load diminish for the poor mechanical properties of adhesive.
出处
《石油机械》
北大核心
2008年第10期1-4,50,共5页
China Petroleum Machinery
基金
国家863计划海洋技术领域2006年度专题课题(2006AA09Z355)
关键词
海洋平台
含裂纹管节点
CFRP片
应力强度因子
有限元仿真
offshore platform, cracked tubular joint, CFRP laminates, stress intensity factor, finite element simulation
