Imaging perturbed shock propagation in powders
| Autor: | A. W. Sapp, Marcia A. Cooper, S. Guo, Tracy Vogler |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Shock wave Imagination Materials science media_common.quotation_subject Tantalum chemistry.chemical_element Perturbation (astronomy) 01 natural sciences Copper 010305 fluids & plasmas Condensed Matter::Materials Science Wavelength chemistry.chemical_compound chemistry Tungsten carbide 0103 physical sciences Diffuse reflection Composite material Instrumentation media_common |
| Zdroj: | Review of Scientific Instruments. 91:025109 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/1.5131348 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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