Bulletin of the American Physical Society
21st Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 64, Number 8
Sunday–Friday, June 16–21, 2019; Portland, Oregon
Session D5: BIEP: Ejecta I |
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Chair: Robin Williams, AWE Room: Broadway I/II |
Monday, June 17, 2019 2:00PM - 2:15PM |
D5.00001: High Speed Imaging of Sheet Breakup Dynamics via Wide Angle Optical Scattering Johnny Goett, John Charonko, William Buttler, Michael Grover, Brandon La Lone, Jason Mance, Ruben Manzanares, John Martinez, Derek Schmidt, Gerald Stevens, William Turley We report on the observation of liquid metal sheet breakup in high pressure gases via the method of wide angle scattering of optical light. Utilizing multi-pulse laser systems and ultra-high speed framing cameras we reveal the evolution of periodic structures previously unseen in transmission radiography and shadowgraphy probes. A quantitative interpretation of results and comparison with popular phenomenological models will be included. [Preview Abstract] |
Monday, June 17, 2019 2:15PM - 2:30PM |
D5.00002: Improvements to Asay Foils for Enhanced Dynamic Range and Robustness Paul Steele, Steve Compton, Louis Ferranti, Jose Sinibaldi Recent changes to Asay foil designs and manufacturing processes have improved robustness against shock, vibration and laser heating during fielding operations. Experimental data shows Asay foils survive more than 40x expected shock and vibration environments and more than 10x expected laser heating energies. Moreover, a fielding strategy is presented and experimentally verified with explosively-driven Sn ejecta that yields 5x improved dynamic range in cumulative ejecta areal mass measurements. [Preview Abstract] |
Monday, June 17, 2019 2:30PM - 2:45PM |
D5.00003: Asay Foil -- Ejecta Interactions Jose Sinibaldi, Paul Steele, Kerry Krauter, Owen Mays, Steve Compton, Lou Ferranti We study how Asay foils behave under impingement of explosively driven Sn ejecta. Experimental data from high-speed shadowgraphy and velocity fields from multi-point photonic Doppler velocimetry measurements are presented. The data is used to elucidate the dynamic response of Asay foils to the multiple impacts of explosively driven Sn ejecta clouds traveling with velocities exceeding 1 km/s. [Preview Abstract] |
Monday, June 17, 2019 2:45PM - 3:00PM |
D5.00004: Hydrodynamics simulations of a low-cost, high-throughput, and compact high-explosive ejecta source platform Leo Kirsch, Fady Najjar, Jose Sinibaldi Ejecta are the particles that are ejected from a material's surface following the release of an extreme shock compression state. These high velocity ballistic particulates play a role in a wide range of phenomena from additive manufacturing, inertial confinement fusion, and supernovae explosions. Production and collision of micron-sized ejecta at velocities of \textasciitilde 1 km/s are difficult phenomena to study experimentally due to the small time and length scales involved. Other large-scale ejecta source experiments have high costs due to the vast amount of high explosive required. This expensive and destructive testing requires long reset times and ultimately yields few precision measurements. The work presented develops a low cost, high-throughput ejecta source platform. The proposed design utilizes small high explosive charges (\textless 1g) which allows future experiments to be conducted at the Dynamic Compression Sector at Argonne National Laboratory where high-resolution X-ray imaging can be used to elucidate the ejecta formation process. We perform detailed continuum hydrodynamics simulations to highlight the feasibility of such a platform. We investigate the sensitivity to generate melt-on-release ejecta with platform geometry, mesh refinement, and materials' equations of state. [Preview Abstract] |
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