Off-Hugoniot strength measurement of tantalum up to 3.3 Mbar using multi-shock loading

ORAL

Abstract

We present experimental details and initial results from multi-shock experiments designed to measure the off-Hugoniot strength of tantalum at pressures ranging from 2.5 to 3.3 Mbar, the first reports of strength measurements made on a gas gun at pressures that exceed the shock-melt pressure. A three-layered gas gun impactor consisting of materials arranged from low to high impedance can produce a quasi-isentropic loading path with a low homologous temperature. This impactor design provides a means of accessing high pressures without melting a material and allows for measuring strength on initial release from high pressure. Additionally, we detail the impactor design modifications implemented to prevent delamination. Comparisons to forward modeling simulation and ramp-release techniques will be presented.

*LLNL-ABS-2002477 Prepared by LLNL under Contract DE-AC52-07NA27344.

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Publication: Wehrenberg, C., Barmore, L.M., Volz, T.J. et al. Design of a Three-Layer Impactor for Material Strength Measurements at Multi-Megabar Pressures. J. dynamic behavior mater. 10, 405–410 (2024). https://doi.org/10.1007/s40870-024-00426-w

Presenters

  • Lauren M Barmore

    • Lawrence Livermore National Laboratory

Authors

  • Lauren M Barmore

    • Lawrence Livermore National Laboratory

  • Travis J Volz

    • Lawrence Livermore National Laboratory

  • Moono Rhee

    • Lawrence Livermore National Laboratory

  • Pat W Ambrose

    • Lawrence Livermore National Laboratory

  • Kathleen Dutton

    • Lawrence Livermore National Laboratory

  • Matt Nelms

    • Lawrence Livermore National Laboratory

  • Christopher Wehrenberg

    • Lawrence Livermore National Laboratory