Numerical modeling of the Disk Pressure Test up to failure under gaseous hydrogen

The present work focuses on non-linear finite element simulations of the Disk Pressure Test, used for characterization of hydrogen embrittlement of metallic materials by bulging out a thin disk under gas pressure until failure. The modeling is based on both elastoplastic and diffusion computations at the macroscopic scale. Hydrogen sensitive cohesive elements are used for crack propagation. Comparison of numerical predictions with experimental data on steel and Inconel gives good agreement both on macroscopic displacement–load curves and on global hydrogen embrittlement features.