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.

翻译：采用实验与计算建模相结合的方法，深入探究单边缺口拉伸（SENT）试验在评估氢脆敏感性方面的适用性。SENT试验旨在获取C110钢在两种腐蚀环境中氢致开裂的I型门槛应力强度因子（$K_{\text{th}}$），并通过氢渗透实验建立环境与吸收氢浓度之间的关联。随后，利用基于相场的变形-扩散-断裂耦合模型对SENT试验进行模拟，所得$K_{\text{th}}$预测值与实验结果吻合良好，揭示了氢吸收-扩散-开裂的交互作用机制。基于多种同时发生的时变现象、三轴应力依赖性及氢脆敏感性区间，系统探讨了SENT试验的适用性及其最优特性（如试验时长）。