Impact of axial stress on ultimate internal pressure of corroded pipelines

doi:10.16265/j.cnki.issn1003-3033.2019.03.012

Abstract

Abstract: In order to study the influence of axial stress on ultimate internal pressure of corroded pipelines, a three-dimensional finite element model of pipeline was established. The model was verified by the blast test data from the literature. The changes of ultimate internal pressure of pipelines under axial compressive stress and axial tensile stress with different corrosion defect parameters and material parameters were analyzed, and the results were based on the finite element simulation. The formula to predict the ultimate internal pressure of corroded pipeline under axial stress was put forward. The results show that the axial compressive stress will lead to reduction of the ultimate internal pressure, that the effect of axial stress on the ultimate internal pressure of pipelines varies and the smaller the defect size is, the more obvious the effect will be, that the axial tensile stress will result in a slightly higher ultimate internal pressure, and the greater the axial stress is, the more obvious the effect will be, that the higher the yield strength of pipelines with different geometric sizes of corrosion defects is, the less obvious the effect of axial stress will be, and that the established ultimate internal pressure formula is accurate, and it can be used for predicting the ultimate internal pressure of corroded pipelines.

Key words: corrosion defect, pipelines, finite element analysis, axial stress, ultimate internal pressure

CLC Number:

X944.4

ZHAO Pengcheng, SHUAI Jian, TANG Yu, XU Kui. Impact of axial stress on ultimate internal pressure of corroded pipelines[J]. China Safety Science Journal, 2019, 29(3): 70-75.

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