| About this Abstract |
| Meeting |
TMS Specialty Congress 2025
|
| Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
| Presentation Title |
Using Discrete Harmonic Expansions and Equilibrium Conditions to Estimate Intragranular Stress Distributions in Polycrystals From Grain-Averaged Data |
| Author(s) |
Wiley Kirks, Paul Dawson, Matthew Miller, Kelly Nygren |
| On-Site Speaker (Planned) |
Wiley Kirks |
| Abstract Scope |
High energy x-ray diffraction microscopy (HEDM/3DXRD) has allowed scientists to probe the micromechanical state of polycrystalline materials under both thermal and mechanical loading in-situ, providing "grain-averaged" elastic strain measurements of the grains within a polycrystal. However, HEDM lacks intragranular resolution, leaving polycrystalline modeling as the only way to resolve internal stress distributions. This work proposes using discrete spherical harmonic expansions over a finite element discretization of the microstructure to define the stress field - greatly decreasing the degrees of freedom compared to the original mesh. Grain-averaged HEDM data are supplemented with inter- and intra-granular equilibrium constraints to determine the expansion weights. The proposed intragranular stress recovery method is demonstrated on C103, a Nb-based refractory alloy. Refractories have become desirable to the material and aerospace communities for their high-temperature properties and resilience in extreme environments where a deeper understanding of mechanical properties is warranted for more successful application in engineering design. |
| Proceedings Inclusion? |
Undecided |