Modelling of short crack propagation – Transition from stage I to stage II |
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| Authors: | B Künkler O Düber P Köster U Krupp C-P Fritzen H-J Christ |
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| Affiliation: | 1. Institute for Mechanics and Control –Mechatronics, University of Siegen, Germany;2. Institute for Materials Science, University of Siegen, Germany;1. BAM-Federal Institute for Materials Research and Testing, Division 9.1, D-12205 Berlin, Germany;2. Materials Mechanics Group, Technische Universität Darmstadt, Franziska-Braun-Str. 3, D-64287 Darmstadt, Germany;3. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria;4. Materials Center Leoben Forschung GmbH, A-8700 Leoben, Austria;5. Pprime Institute, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope Chasseneuil cedex, France;1. Department of Engineering Science, Oxford University, Oxford, England, United Kingdom;2. Mechanical and Biomedical Engineering, National University of Ireland Galway, Ireland;3. Nippon Steel Corporation, Japan;1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China;3. Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China;4. Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, Canada;1. Institut für Werkstofftechnik, Universität Siegen, D-57068 Siegen, Germany;2. Institut für Mechanik und Regelungstechnik - Mechatronik, Universität Siegen, D-57068 Siegen, Germany;1. Department of Mechanical Engineering, École Polytechnique de Montréal, Canada;2. Aluminium Research Center-REGAL, Canada;3. Materials Engineering, McGill University, Canada |
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| Abstract: | The propagation behaviour of short cracks under cyclic loading is simulated using a mechanism-based model for two-dimensional crack propagation in stage I. Experimental investigations on a duplex steel have been performed to characterise the different barrier effects of grain and phase boundaries, so that the crack propagation can be simulated in a real microstructure. The model allows the activation of additional slip systems resulting in a crack propagation on multiple slip bands, which is the preliminary step to stage II crack growth. By use of virtual microstructures based on Voronoi diagrams, it is possible to simulate the overall fatigue-crack propagation process starting from a microstructurally short crack in a single grain until the crack has crossed several (10–20) grains with just one model. |
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