Process of rebound and recirculation of pipe dents based on numerical simulation
This study aims to clarify the effect of pipeline dent formation and rebound-recirculation process on pipeline safety,and further guides the application of internal detection data.Based on Workbench software,the static analysis platform completes the process of indenter loading,indenter unloading and internal pressure application through numerical simulation,and analyzes the influence of factors like indenter shape and size,pipeline materials,pipeline diameter and wall thickness,dent depth and internal pressure,sag location on the rebound and recirculation coefficients.The nonlinear regression for the rebound and recirculation coefficients is also carried out.Finally,the excavation results are analyzed.The results show that the rebound coefficient is inversely proportional to the diameter-to-thickness ratio and the size of the indenter,and is proportional to the dent depth.The recirculation coefficient is inversely proportional to the diameter-to-thickness ratio,indenter size,dent depth,and internal pressure.The regression equations of rebound and recirculation coefficients have an average relative error of 2.96%and 1.24%,respectively,which proves the accuracy of the regression results.Dents detected at the top or bottom of the pipelines should be recalculated to meet the requirements of pipe repair or passage of the pigging device.
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