The aim of this work is to model complex fracture and fatigue processes in microstructural geometries of nodular cast iron. Herein, recently developed generalised phase-field formulation for modelling fracture in brittle and ductile solids subjected to both monotonic and cyclic loading is employed. Three different sized microstructural specimens are analysed using different modelling options to investigate the transition between brittle and ductile fracture material behaviour. The results demonstrate the ability of the proposed model to reproduce crack nucleation and complex crack propagation patterns. Moreover, the low- and high-cyclic fatigue regime features are presented in terms of fracture patterns and Wöhler-type curve.

这项工作的目的是模拟球墨铸铁微观结构几何形状中复杂的断裂和疲劳过程。在此，最近开发的广义相场公式用于模拟承受单调和循环载荷的脆性和延性固体中的断裂。使用不同的建模选项分析了三个不同尺寸的微观结构试样，以研究脆性和韧性断裂材料行为之间的转变。结果证明了所提出的模型能够再现裂纹成核和复杂的裂纹扩展模式。此外，低循环和高循环疲劳状态特征以断裂模式和 Wöhler 型曲线表示。