Session: DA-12-02 The Noel O'Dowd Memorial Symposium on Fracture: Fracture-2

Paper Number: 154551

154551 - Damage Analysis of Pipeline Dents Based on the Ductile Fracture Criterion 

Abstract: 

    During the service life of oil and gas pipelines, the compressive radial loads may cause the pipeline to develop dents, which poses a threat to the safe operation of the pipeline. However, evaluating the damage degree caused by these dents is quite challenging. In order to accurately assess the extent of damage to the pipeline after denting, it is essential to analyze the damage regions and numerical changes of the pipeline indentations based on finite element method. This study established a finite element analysis model of the pipeline under compressive denting, and an ABAQUS subroutine was utilized to visualize the damage values based on the strain-driven ductile fracture criterion. Furthermore, a precise analysis was conducted on how the damage at the dented region of the pipeline varies with the depth of the dent under the influence of internal pressure. The results demonstrate that as the depth of the indentation increases, the location of the maximum damage value shifts from the center of the inner surface of the pipeline outward, exhibiting significant variation in the rate of change of the maximum damage value. The maximum damage value not only increases but also grows at a faster rate when the internal pressure of the pipeline increases or the radius of the indentation decreases. Overall, there is a notable acceleration in the growth rate of the damage values when the indentation depth exceeds 6% of the pipeline's outer diameter. This study provides valuable data for the analysis of pipeline indentation damage and contributes to a more accurate assessment of pipeline safety, thereby helping to mitigate safety risks associated with indentations.

Presenting Author: Jiaqing Zhang China University Of Petroleum

Presenting Author Biography: Jiaqing Zhang received the B.S. degree in Mechanical design, manufacturing and automation from Xi'an University of Science and Technology, Xi’an, China, in 2020 and the M.S. degree in mechanical engineering from Xi'an University of Science and Technology, Xi’an, China, in 2024. He is currently working toward the Ph.D. degree in oil and natural gas engineering with the School of Mechanical and Storage Engineering, China University of Petroleum, Beijing, China. His primary research focus is on the integrity analysis of pipeline structures.

Authors:

Jiaqing Zhang China University Of Petroleum
Xiaoben Liu China University Of Petroleum