Study on failure pressure of hydrogen corroded pipeline under combined action of axial tensile stress and internal pressure
To evaluate the safety status of hydrogen gas transmission pipelines containing corrosion defects under the com-bined action of internal pressure and axial tensile stress,a three-dimensional finite element model was constructed based on Abaqus.The mechanical properties of XI00 pipeline steel under different hydrogen charging time were used to simulate the degree of hydrogen damage of pipeline,and the effect of partial parameters,namely axial tensile stress,hydrogen damage,and defect geometry,was studied and determined.The results show that the synergistic effect of axial tensile stress,internal pres-sure,corrosion,and hydrogen damage can lead to a significant decrease in pipeline failure pressure.The failure pressure de-creases with the increase of hydrogen damage,axial tensile stress,defect length,and defect depth.The stress distribution in the defect area is affected by the axial tensile stress,but it is not affected by hydrogen damage under normal operating condi-tions(i.e.,internal pressure of 10 MPa).The research results are helpful to better understand the failure behavior of hydro-gen transmission pipelines,and optimize the pipeline design and integrity management strategy in the case of hydrogen dam-age.
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