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以大连地区某城市埋地管道实测腐蚀缺陷为依据,采用ANSYS有限元软件模拟均匀、点蚀和组合腐蚀缺陷对管道应力、应变的影响规律.研究结果表明:在均匀腐蚀条件下,腐蚀管道的等效应力与腐蚀深度呈二次曲线关系;当腐蚀缺陷深度低于管壁的30%时,随着长度的增加腐蚀管道的等效应力大致会趋于稳定;相同孔径的腐蚀缺陷条件下,点蚀剩余管壁越薄,管道的等效应力就越大;与单一腐蚀缺陷相比,组合腐蚀条件下管体所受的等效应力较大,管道更容易损坏;在一定的腐蚀缺陷条件下,随着腐蚀管道工作压力的增加管道的等效应力呈线性增长趋势.
Based on the measured corrosion defects in a buried pipeline in a city of Dalian, ANSYS finite element software was used to simulate the influence of uniform, pitting and combined corrosion defects on the stress and strain of the pipeline. The results show that under uniform corrosion conditions, Equivalent stress and corrosion depth showed a quadratic curve. When the depth of corrosion defect was less than 30% of the tube wall, the equivalent stress of the corrosion tube would tend to be stable with the increase of length. Under the same corrosion condition, The thinner the pitting wall is, the greater the equivalent stress of the pipe is. Compared with a single corrosion defect, the equivalent stress on the pipe body under the combined corrosion condition is larger and the pipeline is more easily damaged. Under certain corrosion defect conditions , The equivalent stress of pipeline increases linearly with the increase of working pressure of corrosion pipeline.