  Combined experiments and computational modelling are used to increase
understanding of the suitability of the Single-Edge Notch Tension (SENT) test
for assessing hydrogen embrittlement susceptibility. The SENT tests were
designed to provide the mode I threshold stress intensity factor
($K_{\text{th}}$) for hydrogen-assisted cracking of a C110 steel in two
corrosive environments. These were accompanied by hydrogen permeation
experiments to relate the environments to the absorbed hydrogen concentrations.
A coupled phase-field-based deformation-diffusion-fracture model is then
employed to simulate the SENT tests, predicting $K_{\text{th}}$ in good
agreement with the experimental results and providing insights into the
hydrogen absorption-diffusion-cracking interactions. The suitability of SENT
testing and its optimal characteristics (e.g., test duration) are discussed in
terms of the various simultaneous active time-dependent phenomena, triaxiality
dependencies, and regimes of hydrogen embrittlement susceptibility.
