Burst failure mechanisms of hydrogen-blended pipeline elbows with elliptical corrosion defects using automated finite element analysis

作者：Shoubao Li, Yufeng Yang, Jianchen Shi, Qiang Zhang, Kexin Cheng, Jiaxing Xin, Changqing Gong · 发表于：Journal of Pipeline Science and Engineering · 年份：2025 · DOI：10.1016/j.jpse.2025.100338 · 被引用次数：3 · 研究领域：Structural Integrity and Reliability Analysis、Hydrogen embrittlement and corrosion behaviors in metals、Material Properties and Failure Mechanisms

Hydrogen-blended natural gas transportation represents a cost-effective and efficient hydrogen delivery solution with significant practical implications and application prospects. Currently, research on the failure mechanisms of hydrogen-blended pipeline elbows under the combined effects of hydrogen and elliptical corrosion defects remains unexplored. To address this knowledge gap, this study integrates hydrogen embrittlement theory and finite element analysis, employing a coupled MATLAB-ANSYS simulation approach to efficiently generate numerical models of hydrogen-blended natural gas elbows with external elliptical corrosion defects, while accounting for hydrogen-defect synergistic effects. Systematic study of different hydrogen charging time under the elliptical corrosion defect length, width, depth, pipe wall thickness, pipe diameter, clock angle, elbow angle and other parameters on the burst failure pressure, the study shows that with the increase in hydrogen charging time pipeline burst failure pressure gradually decreased; corrosion length of the pipeline failure pressure has the greatest impact on the rate of reduction; the defect is located in the inner elbow side is more likely to occur burst failure under the same hydrogen charging time. The effects of bend angle, axial bending angle, and bend-to-diameter ratio on the pipe failure pressure are small. This study can greatly improve the efficiency of the integrity evaluation of hydrogen- blended pipelines, and provide...