成品油管道局部屈曲案例分析

发布时间：2019-03-25 15:20

【摘要】：管道屈曲是油气管道的多种失效方式之一,包括管道的局部屈曲和整体屈曲。埋地管道屈曲变形较为复杂,主要影响因素包括内外压力、弯矩、管道的轴端力等。管道受其结构特性影响,在受力和变形条件稍有恶化时就容易发生屈曲破坏。本文针对某局部屈曲破坏成品油管道进行全面的分析和研究。通过开展管材的拉伸、夏比冲击、断裂力学试验,得到管材的常规力学性能参数。利用有限元模拟的方法,建立屈曲管道模型,分析不同载荷下管道受力变形特点及影响因素,研究造成管道屈曲变形的主要原因。结果表明:在一定条件下,材料的冲击功随试验温度增加而增大;管道局部屈曲失稳是受轴向压力、弯矩和内压的联合作用所致,其中轴向载荷过大是造成管道屈曲失稳的主要原因;减少内压和增加壁厚可以增强管道抵抗变形的能力。
[Abstract]:Pipeline buckling is one of the failure modes of oil and gas pipelines, including local buckling and integral buckling. The buckling deformation of buried pipeline is complicated, and the main influencing factors include internal and external pressure, bending moment, axial end force of pipeline and so on. Under the influence of its structural characteristics, the pipeline is prone to buckling failure when the stress and deformation conditions worsen slightly. In this paper, a local buckling failure product pipeline is analyzed and studied in an all-round way. By means of tensile test, Charpy impact test and fracture mechanics test, the conventional mechanical properties parameters of the pipe were obtained. By using the finite element simulation method, the buckling pipeline model is established, and the characteristics and influencing factors of the pipeline deformation under different loads are analyzed. The main causes of the buckling deformation of the pipeline are studied. The results show that under certain conditions, the impact work of the material increases with the increase of test temperature. The local buckling instability of pipeline is caused by the combination of axial pressure, bending moment and internal pressure, in which the excessive axial load is the main cause of buckling instability of pipeline, and reducing the internal pressure and increasing the thickness of wall can enhance the ability of resisting deformation of pipeline.
【作者单位】：中国石油大学(北京)机械与储运工程学院;
【基金】：国家科技支撑计划项目(2015BAK16B02)资助
【分类号】：TE973

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