摘要
钢制输气管道在制造、安装或运行过程中不可避免地会产生表面裂纹缺陷,这些表面裂纹在外力和腐蚀作用下发生扩展造成管道破裂失效,将严重影响高压天然气管道的安全运行,因此,开展了表面裂纹倾角对断裂参数影响规律的研究。采用ANSYS有限元模拟软件,建立了内压作用下含不同表面裂纹的管道的有限元模型,分析了不同倾角表面裂纹的J积分变化规律。研究表明:裂纹尖端J积分值随裂纹倾角近似呈余弦函数规律变化,在相同边界条件下,表面裂纹与管道轴向平行时,J积分值最大,此时表面裂纹最易发生扩展;表面裂纹与管道轴向垂直时,J积分值最小,此时表面裂纹发生扩展的可能性较小。
The defect of surface crack is inevitably produced on steel gas pipelines in the process of manufacture, installation and operation. Under the effect of external force and corrosion, the surface cracks propagate and even result in pipeline rupture and failure, impacting the safe operation of high-pressure gas pipelines badly. Therefore, it is necessary to study the effect laws of surface crack angle on fracture parameter. In this paper, a finite element model for pipelines with different surface cracks under the effect of internal pressure was established by the finite element simulation software ANSYS. And then J-integral change laws of surface cracks with different angles were analyzed. It is shown that the J-integral value of crack tip changes with crack angles approximately in the form of cosine function. If the boundary condition is the same,J-integral value is the maximum when the surface crack is parallel to the pipeline＇s axial direction. And in this case, the surface crack could propagate the most easily. When the surface crack is perpendicular to the pipeline＇s axial direction, the J-integral value is the minimum and the propagation of surface cracks is less possible.
出处
《油气储运》
CAS
北大核心
2017年第6期689-693,共5页
Oil & Gas Storage and Transportation
基金
国家科技重大专项"超稠油集输与处理技术配套技术"
2008ZX05049
关键词
高压钢制管道
表面裂纹
J积分
有限元方法
high-pressure steel pipe
surface crack
J-integral
finite element method
