Abstract
Dent is one of the important factors affecting pipeline fatigue life, and it will greatly reduce the fatigue life of the pipeline in service. Meanwhile the dent displacement will be changed with the operation pressure fluctuations of the in-service pipeline, resulting in a circular bending stress, which directly affect the pipeline fatigue life. For typical I type dent in the pipeline, the finite element models are established under different circumstances. A large number of the calculation results are sorted, inducted, drawed. On this basis, the results are analyzed by univariate and multivariate. Non-linear regression analysis was utilized to fit the results by matlab, some specific expressions of the relationship between the dented pipeline displacements and the dent depth, diameter and thickness of pipeline, and the dent longitudinal length are obtained after much calculation and analog.
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