Stress Analysis of Interlayer Defects of Stainless Steel Lining Repair Composite Pipes
In order to investigate the stress distribution patterns at corrosion defect locations in a composite pipeline before and after repair with stainless steel lining,and to assess the effectiveness of the repair,a pipeline model containing a single corroded pit defect is established using finite element software.The model incorporates variations in the depth-to-diameter ratio of the corrosion pit,disregards the influence of the bonding layer thick-ness on the corrosion pit filling,and employs adhesive behavior to model interfacial interactions between layers.The stress distribution at the corrosion defect locations before and after repair is compared for analysis.With the increase of the depth to thickness ratio of corrosion defects,the radial stress,circumferential stress and Mises stress at the corrosion defect of the pipe wall all tend to increase.The circumferential stress at the defect before repair is the lar-gest,and its value is similar to the Mises stress.After repairing the stainless steel lining,the circumferential stress at the defect decreased by 11.3％and the Mises stress decreased by 7.12％.The depth ratio of corrosion defects has a significant impact on the stress distribution of pipelines,so attention should be paid to the influence of corrosion depth when conducting safety assessment of composite pipelines.Before and after repair,the control stress at the cor-rosion defect of the pipeline has always been the circumferential stress,and the failure of the composite pipeline can be judged according to the circumferential stress.Following the repair with stainless steel lining,there is a significant redistribution of stress at the original defect location,resulting in a notable reduction in both circumferential stress and Mises stress.This indicates a clear improvement in the effectiveness of the repair.
corrosion defectslining repaircomposite pipesstress state
万方数据
维普
