Effect of initial porous density on the shocked equation of state of granular aluminum oxide (Al<sub>2</sub>O<sub>3</sub>)

ORAL

Abstract

The shock compression response of granular or porous materials can differ greatly from that of solid materials. Aluminum oxide (Al2O3), also known as alumina, corundum, or sapphire in its single crystal form, is a hard and strong ceramic that is used in many engineering applications including abrasives, armors, and composite fillers. In prior studies, the shock Hugoniot of solid alumina has been evaluated; however, little work has been done on the dynamic compaction response of granular alumina. In this work, the effect of varying porosity on the equation of state of shock-compressed granular alumina is evaluated with initial densities at around 1.0, 2.0, and 2.5 g/cm3 (25, 51, and 63% theoretical max density, TMD) through a series of tamped Richtmyer-Meshkov instability (RMI) experiments. These experiments were performed at the Dynamic Compression Sector at the Advanced Photon Source Facility at Argonne National Laboratory with a single stage gas gun and the shock response was recorded using X-ray phase contrast imaging. The material interface and shock wave locations in each experiment were evaluated in time to obtain shock and particle velocities, characterizing the alumina Hugoniot equation of state as a function of initial porous density.

*Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia LLC, a wholly owned subsidiary of Honeywell International Inc. for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.This publication is based upon work performed at the Dynamic Compression Sector, which is operated by Washington State University under the U.S. Department of Energy (DOE)/National Nuclear Security Administration award no. DE-NA0003957. This research used resources of the Advanced Photon Source, a DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357.Athena Padgiotis is funded by the Department of Energy National Nuclear Security Administration Laboratory Residency Graduate Fellowship (DOE NNSA LRGF) under grant DE-NA0003960.

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Presenters

  • Athena Padgiotis

    • Texas A&M University College Station

Authors

  • Athena Padgiotis

    • Texas A&M University College Station

  • Ben Zusmann

    • Georgia Institute of Technology

  • Anirban Mandal

    • Lawrence Livermore National Laboratory

  • Vincent Garcia

    • Los Alamos National Laboratory

  • Matthew C Hudspeth

    • Los Alamos National Laboratory (LANL)

  • D Anthony Fredenburg

    • Los Alamos National Laboratory (LANL)

  • Travis J Voorhees

    • Sandia National Laboratories

  • Tracy J Vogler

    • Sandia National Laboratories

  • Scott I Jackson

    • Texas A&M University