Abstract
Corrosion defect growth with time seriously threatens the safe operation of submarine pipelines and the study about its effects on strength degradation is essential for pipeline integrity assessment. In this work, a three-dimensional finite element model was developed to simulate the defect growth on pipeline exposed to sea mud environment based on multiphysical field coupling and deformed geometry. The deeper defect and larger operating pressure (OP) enhance local stress concentration and corrosion rate. The corrosion rate decreases first and then increases with the axial displacement (AD) of pipeline. The OP causes pipelines to corrode preferentially on the defect bottom while AD trends to form uniform corrosion on the total defect surface. There is an anti-synergistic effect between OP and AD on pipe thinning. A residual service life estimation method based on the unsteady multi physical field simulation was proposed for the submarine pipeline.
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