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CMSSM Seminar - Dynamic Behavior of Granular Materials
3:00 pm - 5:00 pm
WRW 102
The dynamic behavior of granular ceramics is being studied through a combination of experiments and simulations. A rich and extremely interesting range of behaviors has been observed in quasi-static experiments on granular materials, but their response to high pressures and strain rates is less explored. In this talk, I will provide an overview of the work at Sandia on granular materials and highlight some interesting recent results.
One of the main experimental tools is planar shock loading, which can be used to load the material from a partially compacted regime all the way to 100’s of GPa using different experimental platforms. These include compressed gas guns, two-stage guns, and the Z machine. In addition to planar impact experiments, we have also been conducting experiments to probe the strength (deviatoric) response of the material including oblique impact and perturbation decay. Finally, we have utilized more complex validation experiments with which to determine the applicability of existing continuum models to multidimensional problems.
To improve our understanding of the fundamental behavior of these materials, multiple modeling tools have been brought to bear. To capture phenomena that emerge from assemblages of grains, we have performed mesoscale calculations utilizing continuum modeling tools. To study coupling between compaction phenomena and phase transformations at modest pressures, we have utilized classical molecular dynamics calculations. Finally, to elucidate the high-pressure thermodynamic behavior of porous materials, we utilize first principles tools such as density functional theory (DFT). Each of these tools provides insight but is limited to a specific regime of applicability.
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