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Fatigue lifetime prediction with a microstructural short crack model for ferritic and martensitic steel

Virtual design against fatigue damage is becoming increasingly important, especially due to the usage of new and improved material simulation tools. In particular, the first two stages of fatigue damage, crack initiation and microstructural short crack growth (MSC), profoundly influence the overall lifetime. Micromechanical finite element simulations with crystal plasticity material behavior are a promising method to capture relevant physical influences on these highly microstructure-dependent stages.
Based on previous work, a transgranular MSC model is described within this framework, enabling two- and threedimensional crack path (see Figure 1) as well as fatigue lifetime prediction. To validate the model's applicability, twodimensional reference data from micro fatigue…

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Virtual design against fatigue damage is becoming increasingly important, especially due to the usage of new and improved material simulation tools. In particular, the first two stages of fatigue damage, crack initiation and microstructural short crack growth (MSC), profoundly influence the overall lifetime. Micromechanical finite element simulations with crystal plasticity material behavior are a promising method to capture relevant physical influences on these highly microstructure-dependent stages.
Based on previous work, a transgranular MSC model is described within this framework, enabling two- and threedimensional crack path (see Figure 1) as well as fatigue lifetime prediction. To validate the model's applicability, twodimensional reference data from micro fatigue specimens is used.
A submodelling technique with meshed electron backscatter diffraction data is employed to simulate the crack propagation, which agrees well with the experimental results. Furthermore, predicted lifetimes for ferritic and martensitic steels subject to uniaxial loading are compared with macro specimen reference data. Threedimensional statistical volume elements with an experimentally informed generation of grain morphology and orientation are utilized for this purpose.
Overall, with an appropriate calibration of the MSC model parameters, good agreement is revealed for both materials.

Reference
LCF9-2022-097

Title
Fatigue lifetime prediction with a microstructural short crack model for ferritic and martensitic steel
Author(s)
E. Natkowski, P. Sonnweber-Ribic, S. Münstermann
DOI
10.48447/LCF9-2022-097
Event
LCF9 - Ninth International Conference on Low Cycle Fatigue
Year of publication
2022
Publication type
conference paper (PDF)
Language
English
Keywords
Finite element method,Micromechanics,Simulation,Crystal plasticity,Microstructural short crack growth