【作者】 刘镇溪； 陈磊； 乔帆帆； 闫兴清； 于帅； 喻健良；

【Author】 LIUZhenxi;CHEN Lei;QIAO Fanfan;YAN Xingqing;YU Shuai;YU Jianliang;Shcool of Chemical Engineering,Dalian University of Technology;School of Chemical Engineering and Technology,Xinjiang University;

【机构】 大连理工大学化工学院； 新疆大学化工学院；

【摘要】 密相/超临界二氧化碳（CO₂）管道是大规模、长距离运输CO₂的首选方式。然而,管道断裂后高压CO₂减压形成较长的压力平台,裂尖压力难以释放,易导致裂纹长程扩展,引发严重的安全隐患。本研究采用流固耦合方法（fluid-structure interaction,FSI）,定量评估了碳纤维复合材料止裂器对密相CO₂管道裂纹扩展控制的效果。基于Abaqus软件,构建了含初始裂纹的Q355 B钢管有限元模型,结合CEL方法模拟CO₂与裂纹扩展的相互作用。通过Johnson-Cook损伤模型来模拟管道材料的断裂行为,采用GERG-2008状态方程来描述CO₂的减压行为。结果表明,数值模拟得到的断裂速度与试验值吻合良好,外部安装的碳纤维复合材料止裂器能显著限制管道的裂纹扩展速度并缩短裂纹扩展距离。本文提出的建模方法和研究结果可为CO₂管道的断裂控制提供有效的技术支撑和设计参考。更多还原

【Abstract】 Dense-phase or supercritical carbon dioxide（CO₂） pipelines are the preferred method for large-scale,long-distance CO₂ transportation.However,pipeline rupture can lead to a rapid depressurization of high-pressure CO₂,resulting in an extended pressure plateau during which the crack tip pressure cannot be effectively relieved.This condition promotes long-distance crack propagation and poses serious safety risks.In this study,a fluid-structure interaction（FSI） approach was employed to quantitatively assess the effectiveness of carbon fiber composite crack arrestors in controlling crack propagation in dense-phase CO₂ pipelines.A finite element model of a Q355 B steel pipe containing an initial crack was developed using Abaqus software,and the interaction between CO₂ decompression and crack propagation was simulated via the Coupled Eulerian-Lagrangian（CEL）method.The Johnson-Cook damage model was used to describe the fracture behavior of the pipe material,while the GERG-2008 equation of state was applied to model the decompression behavior of CO₂.The results demonstrate that the simulated crack propagation velocities agree well with experimental measurements.Furthermore,externally mounted carbon fiber composite crack arrestors significantly reduced both crack propagation speed and crack growth length.The proposed modeling approach and findings provide effective technical support and design guidance for fracture control in CO₂ pipelines.更多还原