20.500.12556/DKUM-87032 Modelling of fatigue microfracture in porous sintered steel using a phase-field method Porosity in sintered materials negatively affects its fatigue properties. In investigating its influence, the application of numerical simulations reduces experimental testing, but they are computationally very expensive. In this work, the application of a relatively simple numerical phase-field (PF) model for fatigue fracture is proposed for estimation of the fatigue life of sintered steels by analysis of microcrack evolution. A model for brittle fracture and a new cycle skipping algorithm are used to reduce computational costs. A multiphase sintered steel, consisting of bainite and ferrite, is examined. Detailed finite element models of the microstructure are generated from high-resolution metallography images. Microstructural elastic material parameters are obtained using instrumented indentation, while fracture model parameters are estimated from experimental S–N curves. Numerical results obtained for monotonous and fatigue fracture are compared with data from experimental measurements. The proposed methodology is able to capture some important fracture phenomena in the considered material, such as the initiation of the first damage in the microstructure, the forming of larger cracks at the macroscopic level, and the total life in a high cycle fatigue regime. However, due to the adopted simplifications, the model is not suitable for predicting accurate and realistic crack patterns of microcracks. sintered steel microcracks fatigue phase-field method porosity sintrano jeklo mikrorazpoke utrujanje metoda faznega polja poroznost true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/journal/materials Članek v reviji 2024-02-09 14:39:19 2024-02-09 14:54:11 2024-04-05 09:20:22 0000-00-00 00:00:00 2023 0 0 Str. 1-22 Št. 11, št. članka 4174 Letn. 16 June 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-04-30 2023-05-30 2023-06-03 621.9:539.3 154724355 10.3390/ma16114174 1996-1944 Tomic-2023-Modelling_of_Fatigue_Microfracture.pdf Tomic-2023-Modelling_of_Fatigue_Microfracture.pdf 1 17B8C8B4D9A3A2A32251AD9DF38F4721 f68a8afcf7a484a43dee90adcac96b94baa9a21ab6d42b35eb069d6cf53180be 8b6b1e1d-c752-11ee-a1af-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=176049 https://doi.org/10.3390/ma16114174 0 9ab8b7e1-c752-11ee-a1af-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=176050 Fakulteta za strojništvo 0 0 0