Inferring Strength of Tantalum from Hydrodynamic Instability Recovery Experiments
| Autor: | G. Ravichandran, Richard Kraus, Y. Opachich, Brian Maddox, Z. Sternberger, Michael Farrell, Bruce Remington, Greg Randall, Christopher Wehrenberg |
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| Rok vydání: | 2018 |
| Předmět: |
Laser ablation
Materials science Materials Science (miscellaneous) Tantalum chemistry.chemical_element Mechanics Strain rate 01 natural sciences Strength of materials Instability 010305 fluids & plasmas chemistry Mechanics of Materials 0103 physical sciences Solid mechanics 010306 general physics Material properties Blast wave |
| Zdroj: | Journal of Dynamic Behavior of Materials. 4:244-255 |
| ISSN: | 2199-7454 2199-7446 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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