In order to clarify the influence of springback and rerounding behavior on the structural integrity of pipeline,and solve the difference in the suitability evaluation results of pipe dents under different constraints,a three-dimensional finite ele-ment model was established to simulate the whole process of dent forming-springback-rerounding of three kinds of pipe types under the action of two kinds of indenter.The influence of pipe type,pipe diameter,wall thickness,indenter type,indenter size,dent position and pitch on the springback and rerounding rate of dent was analyzed,and the empirical formulas of spring-back coefficient and rerounding coefficient of different types of pipeline were obtained by using the nonlinear regression func-tion fitting.The results show that the springback and rerounding behavior of dent are affected by multiple factors such as pipe structure stiffness,dent shape,size,position and internal pressure,which leads to the difference in the deformation history and evaluation conservatism of dent under different constraints.The error analysis presents that the accuracy of fitting prediction is good.The research results can be used for the prediction and evaluation of dent depth based on internal inspection.
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