Analysis and research on ultimate load of oil and gas pipelines with ellipsoidal corrosion defects
Using Solidworks and ANSYS Workbench finite element analysis software,single and double ellipsoidal corrosion defects were studied to investigate the influence of geometric factors on their ultimate load.Firstly,for single ellipsoidal defects,the effects of changes in defect depth,defect length and axial angle,major to minor axis ratio,and defect length on the ultimate load are investigated.Secondly,for double ellipsoidal defects,the effects of changes in axial horizontal distance and different circumferential distance angles on the ultimate load are investigated.Finally,the Response surface methodology is used to analyze the influence of three defect parameters of a single corrosion defect on the ultimate load.The results show that for single ellipsoidal corrosion defects,as the depth and length of the defects increase,the ultimate load gradually decreases.Due to the decrease in the proportion of long and short axes of defects,the ultimate load gradually decreases.Due to the increase in axial angle,the ultimate load first decreases and then increases,resulting in an extreme value.For double ellipsoidal corrosion defects,as the axial horizontal distance and circumferential angle of the two defects gradually increase,the ultimate load first decreases and then increases,and an extreme value appears.Among the single parameters,the depth of defects has the most prominent impact on the ultimate load.In the multi-parameter interaction,the interaction between defect length and defect depth has the most prominent impact on the ultimate load of pipelines.
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