About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Material Responses Investigated Through Novel In-Situ Experiments and Modeling
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| Presentation Title |
Investigating Grain-Scale Cyclic Strain Accumulation and Damage Localization Under Non-Proportional Axial-Torsional Loading Through In-Situ HEDM and Crystal Plasticity Modeling |
| Author(s) |
Yaozhong Zhang, Jerard Gordon, Minh-Son Pham |
| On-Site Speaker (Planned) |
Yaozhong Zhang |
| Abstract Scope |
Non-proportional (NP) multiaxial loading introduces complex deformation paths that critically influence fatigue damage mechanisms in polycrystalline materials. In this work, we combine in-situ high-energy diffraction microscopy (HEDM) and crystal plasticity finite element (CPFE) simulations to investigate the deformation response of ~900 grains in a face-centered cubic polycrystalline multicomponent alloy subjected to fully reversed NP axial-torsional fatigue. Grain-resolved elastic strains, lattice rotations, and orientation gradients were tracked using both far-field and near-field HEDM and incorporated into full-field CPFE simulations. Multiple damage-related metrics including grain reference orientation deviation, stored energy, and Fatemi-Socie fatigue indicator parameter were analyzed with respect to microstructural features such as grain boundaries (GBs) and triple junctions (TJs). Both statistical and hotspot analyses revealed a strong tendency for damage localization near GBs and TJs. This study highlights the strength of integrating in-situ 3D characterization with CPFE modeling to uncover crystal-scale mechanisms governing fatigue crack initiation under NP loading. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Modeling and Simulation, Mechanical Properties |