Bulletin of the American Physical Society
19th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 60, Number 8
Sunday–Friday, June 14–19, 2015; Tampa, Florida
Session U6: Particulate, Porous and Composite Materials V |
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Chair: Anthony Fredenburg, Los Alamos National Laboratory, Christopher Lammi, Georgia Institute of Technology Room: 8/9/10 |
Thursday, June 18, 2015 2:15PM - 2:30PM |
U6.00001: Fracture of explosively compacted aluminum particles in a cylinder David Frost, Jason Loiseau, Sam Goroshin, Fan Zhang, Alec Milne, Aaron Longbottom The explosive compaction, fracture and dispersal of aluminum particles contained within a cylinder have been investigated experimentally and computationally. The aluminum particles were weakly confined in a cardboard tube and surrounded a central cylindrical burster charge. The compaction and fracture of the particles are visualized with flash radiography and the subsequent fragment dispersal with high-speed photography. The aluminum fragments produced are much larger than the original aluminum particles and similar in shape to those generated from the explosive fracture of a solid aluminum cylinder, suggesting that the shock transmitted into the aluminum compacts the powder to near solid density. The casing of the burster explosive (plastic-, copper-, and un-cased charges were used) had little influence on the fragment size. The effect of an air gap between the burster and the aluminum particles was also investigated. The particle motion inferred from the radiographs is compared with the predictions of a multimaterial hydrocode. [Preview Abstract] |
Thursday, June 18, 2015 2:30PM - 2:45PM |
U6.00002: Investigating Velocity Spectra at the Hugoniot State of Shock Loaded Heterogeneous Materials Jeff LaJeunesse, John Borg, Sarah Stewart, Naresh Thadhani Hugoniot states achieved in heterogeneous materials have shown oscillations in particle velocity about an averaged state for both experimental and simulated data. These oscillations arise from the scattering of the transmitted shock wave due to the presence of internal interfaces within heterogeneous materials. The goal of this work is to determine if the spectra of oscillatory behavior can be associated to characteristic length scales of the corresponding un-shocked heterogeneous material. Similarities between different types of shock-loaded materials are compared such as sand, concrete, aluminum foam, and layered composites. [Preview Abstract] |
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