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 (𝐾th) 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 𝐾th 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.