| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Predicting Crack Nucleation From Macroscopic Defects in Steels With Martensitic Microstructure |
| Author(s) |
Danish Ishtiaq Khan, Davide Leonetti, Johan Maljaars |
| On-Site Speaker (Planned) |
Danish Ishtiaq Khan |
| Abstract Scope |
Fabrication processes such as welding often lead to the formation of martensite in steel structures. These processes also result in macroscopic defects, which can lead to fatigue crack nucleation under cyclic loading. To ensure safe usage of such structures, it is important to predict the crack nucleation life (Nn) and related scatter for the defects. In this work, a two-scale approach is presented for assessing Nn for macroscopic defects in the vicinity of the martensitic microstructure. The macroscale is modelled with a continuum elastoplastic finite element model (FEM) of the structure with a defect and the mesoscale is modelled with a crystal plasticity FEM of the microstructure. The deformation of the mesoscale model is set by the macroscale model. For determining Nn, a crystallographic slip-based fatigue indicator parameter is used. The approach is used to study the influence of the shape of the defect along with microstructural variability on Nn. |
| Proceedings Inclusion? |
Planned: |