Fatigue Failure Analysis and Simulation Calculation of Submarine Suspended Pipelines

Under the combined action of sea current and wave force in the suspended section of submarine pipelines, the stress state changes greatly, and fatigue failure is very prone to occur. Based on actual data, this paper establishes a simulation model of the suspended section undersea conditions to explore the stress and fatigue effects of the suspended section. Mainly use the finite element software ANSYS WORKBENCH. The actual engineering is used as the research background to establish a three-dimensional nonlinear finite element model of the interaction between the submarine pipeline and the soil. Under different working conditions, carry out suspended section and stress analysis. Discuss the impact of different factors on the life of subsea pipelines. The emphasis is on the study of whether the vortex-induced resonance effect occurs in the suspended section and the fatigue damage analysis of the submarine pipeline through the two-way fluid-solid coupling. Finally, through data analysis, the stress state and fatigue of the submarine pipeline can be obtained.