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#19828, Dynamic Strengths of SiC, B4C, and CaF2 Powders via the Tamped RMI Method

The pressure-dependent and initial-density-dependent dynamic strengths of three brittle powders, SiC, B4C, and CaF2, are determined via the Tamped Richtmeyer-Meshkov instability (RMI) method. SiC and CaF2 have similar solid densities and significantly different solid strengths. SiC and B4C are similarly high strength ceramics with different solid densities. Plate impact experiments are performed at the Dynamic Compression Sector (DCS), operated by Washington State University, at Argonne National Laboratory’s Advanced Photon Source (APS), driving a shock compression wave through a corrugated copper-powder interface. This event shock compacts the powder and generates significant deformation of the corrugated interface, i.e., an RMI. The growth and evolution of the RMI is descriptive of the collective strengths of the shock compressed powder and copper. Synchrotron radiation from the APS is used to generate X-ray phase contrast images of the deforming copper-powder interface during RMI evolution. To determine dynamic strengths of the powder materials, numerical simulations of the shock compression events are performed using the Sandia hydrocode CTH, iterating the powder strength model parameters until the observed copper-powder interfacial deformation is reproduced. Each experiment generates a single strength vs. shock compressed state (pressure, temperature, density, etc.). The results from each series of experiments are presented in tabulated format and can be used to calibrate complex strength models. The complex strength behaviors of the three ceramic powders are compared with respect to their matrix material properties.

Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & 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.

Travis Voorhees   Sandia National Laboratories
Athena Padgiotis   Texas A&M University
Seth Root   Sandia National Laboratories
Brittany Branch   Sandia National Laboratories
Anirban Mandal   Lawrence Livermore National Laboratory
Tracy Vogler   Sandia National Laboratories