| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
|
| Presentation Title |
In Situ MicroCT Radiograph Corrections for Sub-Micron Scale Digital Volume Correlation |
| Author(s) |
Alex G. Arzoumanidis, Brian K Bay, André Phillion |
| On-Site Speaker (Planned) |
Alex G. Arzoumanidis |
| Abstract Scope |
A mechanical load frame for in situ, micron scale, conical beam X-ray tomography is presented. Rotating the load train within the frame maximizes voxel resolution, since the source can be placed close to the sample. However, the rotating load train introduces complications. Bearing runout and axis misalignments introduce artifacts and errors into reconstructions. Additionally, reconstruction errors imperceptible to the human eye cause problems with digital volume correlation (DVC) and resulting 3D strain measurement. This work describes hardware techniques to minimize runout and procedures to align the two rotating actuators to each other. It also presents a radiograph correction algorithm, where fiducial markers are used to measure runout/alignment during each scan. Digital Image Correlation ideas are used to measure sub-pixel resolution fiducial positions. Finite Element Analysis algorithms are used to correct the 2D X-ray images. The end result is improved reconstructions useable with sub-micron scale DVC displacement field measurements. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, |