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Published November 4, 2020 | Published
Book Section - Chapter Open

Pressure-shear plate impact experiments at very high pressures


Recent modifications of a powder gun facility at Caltech have enabled pressure shear plate impact (PSPI) experiments on materials at very high strain rates (>10⁷ s⁻¹) and pressures (>20 GPa), that have not been reached before. The high strain rate/pressure regime expands significantly the advantages of this well-studied technique. However, it requires overcoming several challenges including requiring a new approach for analysis of the experimental measurements, to extract the material's strength. At high pressures, standard anvils such as steel and tungsten carbide (WC) do not remain elastic, and their inelastic behavior needs to be accounted for in the analysis. The methodology presented here extracts the strength of the material using a hybrid method, combining numerical simulations to simultaneously match both the normal and transverse free surface velocity measurements. First, the inelastic response of the anvils is measured using symmetric PSPI experiments and a material model is calibrated to best match the experimental measurements. Then, measuring the response including the material of interest in a sandwich PSPI configuration, the anvil's material model is used for the analysis and the extraction of the strength of the material of interest. The methodology is demonstrated for soda-lime glass with WC anvils and pure magnesium with steel anvils. The proposed methodology has the potential to expand the PSPI experiments to higher pressures and strain rates.

Additional Information

© 2020 Author(s). Published by AIP Publishing. Published Online: 04 November 2020. The authors are grateful for support from the Office of Naval Research (Award No. N00014-16-1-2839) for the development of the PSPI capability at high pressures and the Air Force Office of Scientific Research (Award No. FA955012-1-0091) for development of the PDV-HTV interferometer system. The PSPI work on magnesium was supported by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-12-2-0022.

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