Finite Element Analysis on Burst Pressure of Steel Pipes with Corrosion Defects

摘要

The effect of metal loses due to corrosion on burst pressure of API X42 steel pipes was studied using nonlinear finite element (FE) method. The nonlinear finite element method coupled with stress modified critical strain (SMCS) model was used to predict the failure of the pipes. In this paper, the corrosion defects were simplified to rectangular shape. The procedure in determining the SMCS model parameters from tensile bars was systematically discussed. The effect of defects length, depth and width was investigated. The burst pressure estimated was then compared to available design codes of corroded pipelines. For validation, the results of burst pressure from FE were compared to experimental data. The depth of corrosion defects appears as the most influential parameter that affects the burst pressure of the pipes.