We report on the stress–density and rate-dependent response for Ta, ramp compressed to 330 Pa with strain rates up to 5 x 108 s-1. We employ temporally shaped laser drives to compress Ta stepped foils over several to tens of nanoseconds. Lagrangian wave-profile analysis reveals a stress–density relationship which falls below the Hugoniot, above the hydrostat, and is consistent with ramp-compression experiments at lower strain rates. We also report on the peak elastic stress prior to plastic deformation as a function of strain rate for laser-driven ramp and shock-compression data spanning the 1–50 × 107 s-1 strain-rate range. When combined with previously published lower strain data (101–107 s-1), we observe a change in rate dependence, suggesting a transition from thermally activated to defect-limited (phonon drag) dislocation motion occurring at a strain rate of about 105 s-1.
Eggert, J. H., et al. "Ramp compression of tantalum to 330 GPa." High Pressure Research, vol. 35, no. 4, Aug. 2015. https://doi.org/10.1080/08957959.2015.1071361
Eggert, J. H., Smith, R. F., Swift, D. C., Rudd, R. E., Fratanduono, D. E., Braun, D. G., Hawreliak, J. A., McNaney, J. M., & Collins, G. W. (2015). Ramp compression of tantalum to 330 GPa. High Pressure Research, 35(4). https://doi.org/10.1080/08957959.2015.1071361
Eggert, J. H., Smith, R. F., Swift, D. C., et al., "Ramp compression of tantalum to 330 GPa," High Pressure Research 35, no. 4 (2015), https://doi.org/10.1080/08957959.2015.1071361
@article{osti_1809146,
author = {Eggert, J. H. and Smith, R. F. and Swift, D. C. and Rudd, R. E. and Fratanduono, D. E. and Braun, D. G. and Hawreliak, J. A. and McNaney, J. M. and Collins, G. W.},
title = {Ramp compression of tantalum to 330 GPa},
annote = {We report on the stress–density and rate-dependent response for Ta, ramp compressed to 330 Pa with strain rates up to 5 x 108 s-1. We employ temporally shaped laser drives to compress Ta stepped foils over several to tens of nanoseconds. Lagrangian wave-profile analysis reveals a stress–density relationship which falls below the Hugoniot, above the hydrostat, and is consistent with ramp-compression experiments at lower strain rates. We also report on the peak elastic stress prior to plastic deformation as a function of strain rate for laser-driven ramp and shock-compression data spanning the 1–50 × 107 s-1 strain-rate range. When combined with previously published lower strain data (101–107 s-1), we observe a change in rate dependence, suggesting a transition from thermally activated to defect-limited (phonon drag) dislocation motion occurring at a strain rate of about 105 s-1.},
doi = {10.1080/08957959.2015.1071361},
url = {https://www.osti.gov/biblio/1809146},
journal = {High Pressure Research},
issn = {ISSN 0895-7959},
number = {4},
volume = {35},
place = {United States},
publisher = {Taylor & Francis},
year = {2015},
month = {08}}
SHOCK COMPRESSION OF CONDENSED MATTER - 2011: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, AIP Conference Proceedingshttps://doi.org/10.1063/1.3686537