腐蚀管道在内压和轴向压力影响下的弯曲破坏
发布时间：2019-04-30 07:53
【摘要】：运行在恶劣环境中的海底管道,往往受到内压、轴力和弯矩等复杂荷载的联合作用。腐蚀会导致管壁局部变薄,降低管道极限承载力。为保证管道安全高效运行,准确预测和分析复杂荷载作用下的塑性极限承载力和变形行为就显得尤为重要。考虑大应变和大变形、应力强化和材料非线性,运用数值仿真软件建立腐蚀缺陷管道的三维实体有限元模型,在全尺寸管道破坏试验验证的基础上,对腐蚀管道在内压、轴向压力和弯矩相互作用下的失效模式和极限弯矩承载力进行了相关研究,并进行了腐蚀缺陷几何参数的敏感性分析。研究结果表明:初始内压和初始轴向压力会显著降低腐蚀管道的极限弯矩承载力,并且影响最终的失效模式;在腐蚀缺陷几何尺寸参数中,腐蚀宽度比腐蚀深度和腐蚀长度的影响更大。
[Abstract]:Submarine pipelines operating in harsh environments are often subjected to complex loads, such as internal pressure, axial force and bending moment. Corrosion will lead to local thinning of the pipe wall and decrease the ultimate bearing capacity of the pipe. In order to ensure the safe and efficient operation of pipeline, it is very important to accurately predict and analyze the plastic ultimate bearing capacity and deformation behavior under complex loads. Considering large strain and large deformation, stress strengthening and material nonlinearity, the three-dimensional solid finite element model of corrosion defect pipeline is established by using numerical simulation software. On the basis of full-scale pipeline failure test, the corrosion pipe is subjected to internal pressure. The failure mode and ultimate moment bearing capacity under the interaction of axial pressure and bending moment are studied, and the sensitivity analysis of geometric parameters of corrosion defects is carried out. The results show that the initial internal pressure and the initial axial pressure can significantly reduce the ultimate bending moment bearing capacity of the corroded pipeline and affect the final failure mode. The influence of corrosion width is greater than corrosion depth and corrosion length in the geometric dimension parameters of corrosion defects.
【作者单位】： 大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2011CB013702) 新世纪优秀人才支持计划资助(NCET-11-0051)
【分类号】：P756.2
，
本文编号：2468614
[Abstract]:Submarine pipelines operating in harsh environments are often subjected to complex loads, such as internal pressure, axial force and bending moment. Corrosion will lead to local thinning of the pipe wall and decrease the ultimate bearing capacity of the pipe. In order to ensure the safe and efficient operation of pipeline, it is very important to accurately predict and analyze the plastic ultimate bearing capacity and deformation behavior under complex loads. Considering large strain and large deformation, stress strengthening and material nonlinearity, the three-dimensional solid finite element model of corrosion defect pipeline is established by using numerical simulation software. On the basis of full-scale pipeline failure test, the corrosion pipe is subjected to internal pressure. The failure mode and ultimate moment bearing capacity under the interaction of axial pressure and bending moment are studied, and the sensitivity analysis of geometric parameters of corrosion defects is carried out. The results show that the initial internal pressure and the initial axial pressure can significantly reduce the ultimate bending moment bearing capacity of the corroded pipeline and affect the final failure mode. The influence of corrosion width is greater than corrosion depth and corrosion length in the geometric dimension parameters of corrosion defects.
【作者单位】： 大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2011CB013702) 新世纪优秀人才支持计划资助(NCET-11-0051)
【分类号】：P756.2
，
本文编号：2468614
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