About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Mitigating Localized Plastic Strain Accumulation in Cyclic Loading of Polycrystalline Shape Memory Ceramics: A Phase-field Study |
Author(s) |
Amirreza Lotfolahpour, Mohsen Asle Zaeem |
On-Site Speaker (Planned) |
Amirreza Lotfolahpour |
Abstract Scope |
Deterioration under cyclic loading is the main factor stalling various applications of shape memory ceramics (SMCs). Under cyclic loading, the fatigue cracks form from the accumulation of plastic strains in regions with high stress concentrations such as grain boundaries and phase interfaces. Therefore, the plastic strain accumulation rate can be used to assess the fatigue crack initiation and the cyclic life in these ceramics. We propose a phase-field modeling approach to investigate the localized plastic strain accumulation and cyclic behavior of zirconia-based SMCs by coupling the phase-field phase transformation and a viscoplastic model. We investigate the effects of grain orientation as well as engineered defects on mitigating the localized plastic accumulation and phase transformation induced expansion, and possibly increasing the fatigue life of these ceramics. |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Ceramics, Computational Materials Science & Engineering |