Inferring Strength of Tantalum from Hydrodynamic Instability Recovery Experiments

Inferring Strength of Tantalum from Hydrodynamic Instability Recovery Experiments Hydrodynamic instability experiments allow access to material properties at extreme conditions, where strain rates exceed 105 s−1 and pressures reach 100 GPa. Current hydrodynamic instability experimental methods require in-flight radiography to image the instability growth at high pressure and high strain rate, limiting the facilities where these experiments can be performed. An alternate approach, recovering the sample after loading, allows measurement of the instability growth with profilometry. Tantalum samples were manufactured with different 2D and 3D initial perturbation patterns and dynamically compressed by a blast wave generated by laser ablation. The samples were recovered from peak pressures between 30 and 120 GPa and strain rates on the order of 107 s−1, providing a record of the growth of the perturbations due to hydrodynamic instability. These records are useful validation points for hydrocode simulations using models of material strength at high strain rate. Recovered tantalum samples were analyzed, providing an estimate of the strength of the material at high pressure and strain rate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Dynamic Behavior of Materials Springer Journals

Inferring Strength of Tantalum from Hydrodynamic Instability Recovery Experiments

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Publisher
Springer International Publishing
Copyright
Copyright © 2018 by Society for Experimental Mechanics, Inc
Subject
Materials Science; Metallic Materials; Continuum Mechanics and Mechanics of Materials
ISSN
2199-7446
eISSN
2199-7454
D.O.I.
10.1007/s40870-018-0153-7
Publisher site
See Article on Publisher Site

Abstract

Hydrodynamic instability experiments allow access to material properties at extreme conditions, where strain rates exceed 105 s−1 and pressures reach 100 GPa. Current hydrodynamic instability experimental methods require in-flight radiography to image the instability growth at high pressure and high strain rate, limiting the facilities where these experiments can be performed. An alternate approach, recovering the sample after loading, allows measurement of the instability growth with profilometry. Tantalum samples were manufactured with different 2D and 3D initial perturbation patterns and dynamically compressed by a blast wave generated by laser ablation. The samples were recovered from peak pressures between 30 and 120 GPa and strain rates on the order of 107 s−1, providing a record of the growth of the perturbations due to hydrodynamic instability. These records are useful validation points for hydrocode simulations using models of material strength at high strain rate. Recovered tantalum samples were analyzed, providing an estimate of the strength of the material at high pressure and strain rate.

Journal

Journal of Dynamic Behavior of MaterialsSpringer Journals

Published: May 3, 2018

References

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