About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
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Microstructure-Sensitive Design and Advanced Characterization: An MPMD/SMD Symposium Honoring David T. Fullwood
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| Presentation Title |
A cohesive zone model for grain boundary plasticity to interpret high-resolution strain maps |
| Author(s) |
Eralp Demir, Benjamin Poole, Chris Hardie, Edmund Tarleton |
| On-Site Speaker (Planned) |
Eralp Demir |
| Abstract Scope |
High-resolution digital image correlation (HR-DIC) has revealed unexpectedly large shear strains concentrated along grain boundaries in a range of polycrystalline materials, even at room temperature. Whether this apparent grain boundary sliding is confined to the free surface or reflects a bulk deformation mechanism remains an open question. We present a cohesive zone formulation that explicitly models grain boundary plasticity that is coupled with a crystal plasticity framework (OXFORD-UMAT) to investigate this behaviour. Zero-thickness cohesive elements were developed in Abaqus user elements (UEL). The formulation enables stable simulation of intergranular plasticity while maintaining compatibility with crystal plasticity models in the grain interiors. Simulations on two- and three-dimensional polycrystalline microstructures are used to examine the distribution of grain boundary deformation beneath the free surface and are compared with HR-DIC measurements. The proposed framework offers a new tool for quantifying the role of grain boundary plasticity in polycrystalline deformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, Mechanical Properties |