Stress analysis of plain dent on pipeline based on FE calculation

According to the report of the United States transportation department, mechanical damage is one of the most important reasons for the pipeline accident. The most typical form of mechanical damage is indentation. Dent defect is one of the important factors that influence the pipeline stress. For plain typical dent on pipeline, changing various parameters, the finite element models are established under different circumstances by finite element method. A large number of the calculation results are sorted, inducted, drawed. On this basis, the results are analyzed. Non-linear regression analysis was utilized to fit the results by Matlab, some specific expression of the relationships between the dented pipeline maximum stress and the dent depth, diameter and thickness of pipeline, and the dent longitudinal length are obtained after much calculation and analog.