About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Dynamic Behavior of Materials IX
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Presentation Title |
Understanding the Ejecta Dynamics in Gas Cells for Shallow Bubble Collapse Mechanism |
Author(s) |
Georges Akiki, Garry Maskaly, Fady Najjar, Gerald Stevens, William Turley, Brandon La Lone, Matthew Staska |
On-Site Speaker (Planned) |
Georges Akiki |
Abstract Scope |
We have recently observed that metal samples, subject to certain multi-shock conditions, generate substantially more ejecta compared to those produced from Richtmyer-Meshkov Instability (RMI). This mechanism activates due to bubbles forming near the surface of liquified metal, following a shock-and-release event. These bubbles collapse under an additional shock insult, thus releasing significant amounts of ejecta (~10X more than RMI) at very high temperatures (more than twice that expected without cavitation). We refer to this phenomenon as Shallow Bubble Collapse (SBC). Our study will present experimental measurements and numerical results of ejecta produced by SBC comparing ejection into gases and vacuum. We examine the impact of gas pressure on SBC ejecta transport and evolution. Numerical simulations using LLNL’s hydrodynamics code, ARES, will be used to examine these physics.
Work performed under the auspices of the U.S. DOE by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. LLNL-ABS-823842. |
Proceedings Inclusion? |
Planned: |