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Title: Imaging perturbed shock propagation in powders

Abstract

A novel experimental methodology is presented to study the deviatoric response of powders in shock regimes. The powders are confined to a cylindrical wedge volume, and a projectile-driven shock wave with a sinusoidally varying front propagates through the powder. The perturbed shock wave exhibits a damping behavior due to irreversible processes of viscosity and strength (deviatoric) of the powder with propagation through increasing powder thicknesses. The inclined surface of the wedge is polished and coated to establish a diffuse surface suitable for reflecting incident laser light into a high-speed camera imaging at 5 MHz. Images of the contrast loss upon shock wave arrival at the observation surface are post-processed for qualitative and quantitative information. New data of shock damping behavior with parameters of perturbation wavelength and initial shock strength are presented for powders of copper, tantalum, and tungsten carbide as well as their mixtures. We present the first full-field images showing additional spatial disturbances on the perturbed shock front that appear dependent on particle material and morphology.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1607504
Alternate Identifier(s):
OSTI ID: 1601321
Report Number(s):
SAND-2020-1988J
Journal ID: ISSN 0034-6748; 683964
Grant/Contract Number:  
AC04-94AL85000; NA-0003525
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 91; Journal Issue: 2; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Granular materials; Shock waves; Optical imaging; Image processing; Light-gas gun; Irreversible process

Citation Formats

Cooper, M. A., Sapp, A. W., Guo, S., and Vogler, T. J. Imaging perturbed shock propagation in powders. United States: N. p., 2020. Web. https://doi.org/10.1063/1.5131348.
Cooper, M. A., Sapp, A. W., Guo, S., & Vogler, T. J. Imaging perturbed shock propagation in powders. United States. https://doi.org/10.1063/1.5131348
Cooper, M. A., Sapp, A. W., Guo, S., and Vogler, T. J. Sat . "Imaging perturbed shock propagation in powders". United States. https://doi.org/10.1063/1.5131348. https://www.osti.gov/servlets/purl/1607504.
@article{osti_1607504,
title = {Imaging perturbed shock propagation in powders},
author = {Cooper, M. A. and Sapp, A. W. and Guo, S. and Vogler, T. J.},
abstractNote = {A novel experimental methodology is presented to study the deviatoric response of powders in shock regimes. The powders are confined to a cylindrical wedge volume, and a projectile-driven shock wave with a sinusoidally varying front propagates through the powder. The perturbed shock wave exhibits a damping behavior due to irreversible processes of viscosity and strength (deviatoric) of the powder with propagation through increasing powder thicknesses. The inclined surface of the wedge is polished and coated to establish a diffuse surface suitable for reflecting incident laser light into a high-speed camera imaging at 5 MHz. Images of the contrast loss upon shock wave arrival at the observation surface are post-processed for qualitative and quantitative information. New data of shock damping behavior with parameters of perturbation wavelength and initial shock strength are presented for powders of copper, tantalum, and tungsten carbide as well as their mixtures. We present the first full-field images showing additional spatial disturbances on the perturbed shock front that appear dependent on particle material and morphology.},
doi = {10.1063/1.5131348},
journal = {Review of Scientific Instruments},
number = 2,
volume = 91,
place = {United States},
year = {2020},
month = {2}
}

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