Atomistic Simulations of Crack Front Curvature Effects and Crack-Microstructure Interactions
The resistance against crack propagation is undoubtedly one of the most important properties of metallic materials. Particularly in the early stage of their existence, the growth of cracks is influenced by interactions with the surrounding microstructure, e.g., grain boundaries and dislocations. In...
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| פורמט: | Online |
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FAU University Press
2025
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| גישה מקוונת: | ONIX_20250828T094736_9783961470082_6 |
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| _version_ | 1869528778191929344 |
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| author | Möller, Johannes J. |
| author_browse | Möller, Johannes J. |
| author_facet | Möller, Johannes J. |
| author_sort | Möller, Johannes J. |
| collection | Directory of Open Access Books |
| description | The resistance against crack propagation is undoubtedly one of the most important properties of metallic materials. Particularly in the early stage of their existence, the growth of cracks is influenced by interactions with the surrounding microstructure, e.g., grain boundaries and dislocations. In this context, atomistic simulations play an important role in providing valuable information about fundamental crack tip processes, which can be used for the development of larger-scale models to predict crack propagation in realistic microstructures. The present thesis contributes to this development by systematically determining the influences of crack front curvature and grain boundary (GB) structure on the competition between brittle fracture and crack tip plasticity in body-centered cubic (bcc) metals. For this purpose, multi-million atom molecular statics and dynamics simulations of perfectly straight and penny-shaped cracks were performed in defect-free single crystals and for the first time at GBs. Crack-dislocation interactions were exemplarily investigated for selected crack and slip systems. At curved crack fronts, many slip planes intersect parts of the crack front and the tendency for crack tip plasticity is consequently higher than for infinitely long and straight crack fronts. At GBs, locally varying bonding situations lead to the dependence of the fracture resistance on the crack tip position and crack propagation direction. Crack-dislocation interactions are dominated by dislocation cross slip and subsequent glide along the crack front leading to local crack tip blunting. |
| format | Online |
| id | doab-20.500.12854ir-166265 |
| institution | Directory of Open Access Books |
| language | eng |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | FAU University Press |
| publisherStr | FAU University Press |
| record_format | ojs |
| spelling | doab-20.500.12854ir-1662652025-10-16T13:01:55Z Atomistic Simulations of Crack Front Curvature Effects and Crack-Microstructure Interactions Möller, Johannes J. Rissbildung Molekulardynamik Korngrenze Versetzung Eisen thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes The resistance against crack propagation is undoubtedly one of the most important properties of metallic materials. Particularly in the early stage of their existence, the growth of cracks is influenced by interactions with the surrounding microstructure, e.g., grain boundaries and dislocations. In this context, atomistic simulations play an important role in providing valuable information about fundamental crack tip processes, which can be used for the development of larger-scale models to predict crack propagation in realistic microstructures. The present thesis contributes to this development by systematically determining the influences of crack front curvature and grain boundary (GB) structure on the competition between brittle fracture and crack tip plasticity in body-centered cubic (bcc) metals. For this purpose, multi-million atom molecular statics and dynamics simulations of perfectly straight and penny-shaped cracks were performed in defect-free single crystals and for the first time at GBs. Crack-dislocation interactions were exemplarily investigated for selected crack and slip systems. At curved crack fronts, many slip planes intersect parts of the crack front and the tendency for crack tip plasticity is consequently higher than for infinitely long and straight crack fronts. At GBs, locally varying bonding situations lead to the dependence of the fracture resistance on the crack tip position and crack propagation direction. Crack-dislocation interactions are dominated by dislocation cross slip and subsequent glide along the crack front leading to local crack tip blunting. 2025-08-29T05:07:56Z 2025-08-29T05:07:56Z 2025-08-28T07:58:27Z 2017 book ONIX_20250828T094736_9783961470082_6 https://library.oapen.org/handle/20.500.12657/105762 9783961470082 9783961470075 https://directory.doabooks.org/handle/20.500.12854/166265 eng FAU Forschungen : Reihe B open access image/jpeg image/jpeg n/a n/a https://library.oapen.org/bitstream/20.500.12657/105762/1/9783961470082.pdf https://library.oapen.org/bitstream/20.500.12657/105762/1/9783961470082.pdf FAU University Press 2c600dea-eece-4066-87be-da335e323fdb 9783961470082 9783961470075 AG Universitätsverlage 218 Erlangen open access |
| spellingShingle | Rissbildung Molekulardynamik Korngrenze Versetzung Eisen thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes Möller, Johannes J. Atomistic Simulations of Crack Front Curvature Effects and Crack-Microstructure Interactions |
| title | Atomistic Simulations of Crack Front Curvature Effects and Crack-Microstructure Interactions |
| title_full | Atomistic Simulations of Crack Front Curvature Effects and Crack-Microstructure Interactions |
| title_fullStr | Atomistic Simulations of Crack Front Curvature Effects and Crack-Microstructure Interactions |
| title_full_unstemmed | Atomistic Simulations of Crack Front Curvature Effects and Crack-Microstructure Interactions |
| title_short | Atomistic Simulations of Crack Front Curvature Effects and Crack-Microstructure Interactions |
| title_sort | atomistic simulations of crack front curvature effects and crack microstructure interactions |
| topic | Rissbildung Molekulardynamik Korngrenze Versetzung Eisen thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes |
| topic_facet | Rissbildung Molekulardynamik Korngrenze Versetzung Eisen thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes |
| url | ONIX_20250828T094736_9783961470082_6 |
| work_keys_str_mv | AT mollerjohannesj atomisticsimulationsofcrackfrontcurvatureeffectsandcrackmicrostructureinteractions |