基于XFEM的含裂纹输氢管道疲劳断裂研究OA

Hydrogen energy is a crucial component of the future national energy system and plays a supporting role in the re-alization of the carbon peaking and carbon neutrality goals.Pipeline transportation is considered as the best way to achieve low-cost and large-scale transportation.However,under the effect of hydrogen embrittlement,hydrogen pipeline is more prone to fatigue failure.In response to the current uncertainty regarding the mechanism of fatigue crack propagation in hydro-gen pipelines,and the challenges associated with simulating the process and the high computational costs involved,this study derived the Paris formula based on energy release rate using fracture mechanics theory.The extended finite element method(XFEM)was then employed to investigate the fatigue failure mode of hydrogen pipeline with cracks,and an analysis of fac-tors influencing the fatigue life of hydrogen pipeline was conducted.The results show that the fatigue failure behavior of hy-drogen pipeline is controlled by the crack depth rather than the energy release rate.The fatigue life of hydrogen pipeline de-creases with the increase of hydrogen pressure and the decrease of stress ratio.The initial crack size also affects the fatigue life of hydrogen pipeline,with the variation in crack depth having a more significant impact on the fatigue life of the pipeline.