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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/11/4174 |
| _version_ | 1797597137974853632 |
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| author | Zoran Tomić Tomislav Jarak Tomislav Lesičar Nenad Gubeljak Zdenko Tonković |
| author_facet | Zoran Tomić Tomislav Jarak Tomislav Lesičar Nenad Gubeljak Zdenko Tonković |
| author_sort | Zoran Tomić |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-11T03:02:32Z |
| format | Article |
| id | doaj.art-578f8b139b324ec08e6fb64c01e96a34 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T03:02:32Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-578f8b139b324ec08e6fb64c01e96a342023-11-18T08:11:18ZengMDPI AGMaterials1996-19442023-06-011611417410.3390/ma16114174Modelling of Fatigue Microfracture in Porous Sintered Steel Using a Phase-Field MethodZoran Tomić0Tomislav Jarak1Tomislav Lesičar2Nenad Gubeljak3Zdenko Tonković4Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, CroatiaFaculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, CroatiaFaculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, CroatiaFaculty of Mechanical Engineering, University of Maribor, 2000 Maribor, SloveniaFaculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, CroatiaPorosity 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.https://www.mdpi.com/1996-1944/16/11/4174sintered steelmicrocracksfatiguephase-field methodporosity |
| spellingShingle | Zoran Tomić Tomislav Jarak Tomislav Lesičar Nenad Gubeljak Zdenko Tonković Modelling of Fatigue Microfracture in Porous Sintered Steel Using a Phase-Field Method Materials sintered steel microcracks fatigue phase-field method porosity |
| title | Modelling of Fatigue Microfracture in Porous Sintered Steel Using a Phase-Field Method |
| title_full | Modelling of Fatigue Microfracture in Porous Sintered Steel Using a Phase-Field Method |
| title_fullStr | Modelling of Fatigue Microfracture in Porous Sintered Steel Using a Phase-Field Method |
| title_full_unstemmed | Modelling of Fatigue Microfracture in Porous Sintered Steel Using a Phase-Field Method |
| title_short | Modelling of Fatigue Microfracture in Porous Sintered Steel Using a Phase-Field Method |
| title_sort | modelling of fatigue microfracture in porous sintered steel using a phase field method |
| topic | sintered steel microcracks fatigue phase-field method porosity |
| url | https://www.mdpi.com/1996-1944/16/11/4174 |
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