Sensitivity analysis of a 2D cohesive model for hydrogen embrittlement of AISI 4130

A finite element cohesive zone model able to reproduce the effect of hydrogen exposition on the fracture toughness properties of a low alloy Cr-Mo steel, AISI 4130, is here presented. The model simulates the embrittlement effect of hydrogen by decreasing the constitutive law of cohesive elements that reproduces the crack propagation behaviour of the material according to the calculated total hydrogen concentration.The model is validated by comparison with experimental data. Finally, a sensitivity analysis of the model that mimics both different material parameters and environment conditions proves its efficiency as a predictive tool for the mechanical response of the material.