This two-year, $574,545 National Science Foundation project grant funds research at Dartmouth College to improve understanding of snowpack deformation and avalanche initiation. The Engineering Directorate award will support experiments and micromechanical modeling to observe the behavior of snow and ice lenses under load. Researchers will deform snow and layered snow-ice specimens in a cold room using micro computed tomography to resolve how differences in grain size, type, and density influence local and global deformation. Artificially-created ice lenses oriented at 90 and 45 degrees will be examined via micro CT and scanning electron microscopy to observe microstructure evolution, bond formation and breaking at the individual crystal level. Complementary macro-scale deformation experiments on 10cm cubes containing ice lenses will also be conducted under varying strain rates and temperatures, imaged with high-speed video. Observations will inform robust multiscale computational models describing microstructural changes in snowpacks under load, microscale deformation mechanisms, and the ductile-to-brittle transition of ice. Completion is scheduled for December 31, 2025.
Mod # | Description | Reason For Modification | Federal Obligation (Click to sort descending) | Date (Click to sort ascending) |
|---|---|---|---|---|
| Not listed | $574.5k | 11/2/22 |