Sedlak Mosesson Michal, Alfredsson Bo, Efsing Pål
Department of Engineering Mechanics, Royal Institute of Technology KTH, SE-100 44 Stockholm, Sweden.
Ringhals AB, SE-43285 Väröbacka, Sweden.
Materials (Basel). 2021 Jun 23;14(13):3509. doi: 10.3390/ma14133509.
Adaptive oxide thickness was developed in a cohesive element based multi-physics model including a slip-oxidation and diffusion model. The model simulates the intergranular stress corrosion cracking (IGSCC) in boiling water reactors (BWR). The oxide thickness was derived from the slip-oxidation and updated in every structural iteration to fully couple the fracture properties of the cohesive element. The cyclic physics of the slip oxidation model was replicated. In the model, the thickness of the oxide was taken into consideration as the physical length of the cohesive element. The cyclic process was modelled with oxide film growth, oxide rupture, and re-passivation. The model results agreed with experiments in the literature for changes in stress intensity factor, yield stress representing cold work, and environmental factors such as conductivity and corrosion potential.
基于包含滑移氧化和扩散模型的内聚单元多物理场模型，开发了自适应氧化膜厚度。该模型模拟沸水反应堆（BWR）中的晶间应力腐蚀开裂（IGSCC）。氧化膜厚度由滑移氧化得出，并在每次结构迭代中更新，以充分耦合内聚单元的断裂特性。复制了滑移氧化模型的循环物理过程。在该模型中，氧化膜厚度被视为内聚单元的物理长度。通过氧化膜生长、氧化膜破裂和再钝化对循环过程进行建模。模型结果与文献中的实验结果在应力强度因子变化、代表冷加工的屈服应力以及电导率和腐蚀电位等环境因素方面相符。
