摘要
海洋管道复合材料修复过程中,考虑管道裂纹长度和工作压力是保证复合材料修复效果的重要因素,但是由于初始裂纹方向的不确定性,有必要研究裂纹方向对复合材料修复效果的影响。运用有限元软件对局部立管模型的碳纤维增强型复合材料修复模型进行分析,通过对比裂纹尖端的应力强度因子完成修复效果的评估。研究结果表明:除了工作压力和裂纹长度外,裂纹方向也会影响复合材料的修复效果。当工作压力较低时,复合材料修复效果随着初始裂纹与立管轴线夹角的减小而显著增强。对于与立管轴线夹角比较大的裂纹在进行复合材料修复时可以不考虑工作压力变化对修复效果的影响。研究结果对海洋立管复合材料修复方法的设计具有一定的指导意义。
Considering the length of pipeline crack and the working pressure are important factors to ensure the repair performance of composite materials in marine pipeline maintenance,and taking the uncertainty of initial crack direction into account,it is necessary to study the effect of crack direction on the repair performance of composite materials. The finite element software was used to analyze the carbon fiber reinforced composite material repair model of the local riser model. The repair performance has been assessed through comparing the stress intensity factor at the crack tip. The results show that the crack direction also affects the repairing performance of the composite material in addition to the working pressure and the crack length. Given the low working pressure,the repair performance of the composite material is significantly enhanced with the decrease of the angle between the initial crack direction and the riser axis. For cracks with a large angle with the riser axis,the effect of the working pressure on the repair performance could be ignored. The results of the study could provide guidance for the design of marine riser repair using composite material.
出处
《石油机械》
2017年第4期48-54,共7页
China Petroleum Machinery
基金
国家自然科学基金项目"深海极端环境下复合材料立管粘结接头的强度及断裂研究"(11302264)
国家973计划项目"深海柔性结构的非线性流固耦合振动与破坏机理"(2011cb013702)
中国石油大学(北京)科研基金资助项目(2462015YQ0403)
关键词
海洋立管
复合材料
缺陷修复
初始裂纹方向
应力强度因子
marine riser
composite material
defect repair
initial crack direction
stress intensity factor
