About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Quantitative X-ray Phase Contrast Imaging of Granular Media under Dynamic Impact |
Author(s) |
Todd C. Hufnagel, A.F.T. Leong, Vignesh Kannan, Kaliat T. Ramesh |
On-Site Speaker (Planned) |
Todd C. Hufnagel |
Abstract Scope |
The response of granular-materials to dynamic loading is complicated due to their heterogeneous structure. Imaging the material provide detailed information about the evolution of structure. But under dynamic-loading there is not enough time to record the multiple projections required for tomography, and we are restricted to collecting single, 2D-projections of complex 3D structures. In this talk, we describe x-ray phase-contrast imaging (XPCI) studies of the structure of geological materials subjected to dynamic-deformation. Although the XPCI images are too complex for direct interpretation, using a robust algorithm we can extract quantitative structural information, including the porosity and mean pore size. We illustrate the application of this algorithm to dynamic wedge impact of sandstone. Formation of an extended wedge of compacted material in front of the indenter induces dilation further downfield, leading to intergranular cracking and fracture. This study provides new insights into the connections between mesoscale mechanisms and macroscopic mechanical behavior. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |