COMPUTATIONAL MODELING OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN PIPELINE STEELS
Andrew J. Slifka, Robert L. Amaro, Elizabeth S. Drexler, Devin T. O'Connor, Benjamin E. Long
In this work we further develop a model to predict hydrogen-assisted fatigue crack growth in steel pipelines and pressure vessels. This implementation of the model is informed by finite element code, which uses an elastic-plastic constitutive model in conjunction with a hydrogen diffusion model to predict the deformation and concentration of hydrogen around a fatigue crack tip. The hydrogen concentration around the crack tip is used to inform our fatigue crack growth model and account for the effect of hydrogen embrittlement. We first use our model to predict the fatigue crack growth of X100 pipeline steel at different levels of applied hydrogen pressure. We show that our simulated results compare well with prior X100 experimental fatigue crack growth work.
Proceeding of the International Hydrogen Conference 2016