Mechanical behavior analysis of corroded pipelines used to transport hydrogen

Abstract

This paper is dedicated to the implementation of a numerical model of corroded pipelines using the finite element method. This last model was carried out on the commercial software ANSYS Apdl. A numerical model of a pipeline with one defect was made to validate the results of the bursting stress. This results have been compared with data and results from experimental and analytical large-scale pipeline tests. Then, four numerical models were implemented with different types of external defects. Thanks to these models, we carried out a series of numerical tests for the four cases, and from the results obtained, we found that the depth of the defect affects the stress more than the circumferential Sc and longitudinal Sl spacing between the defects. On the other hand, the interaction between the defects clearly manifests when these spacings take small values. In addition, for larger spacings, we noticed the absence of interactions between the defects, and each defect alone affects the equivalent Von Mises stress.