Recent progress in the development of dynamic strength experimental platforms is allowing for unprecedented insight into the assumptions used to construct constitutive models operating in extreme conditions. In this work, we make a quantitative assessment of how tantalum strength scales with its shear modulus to pressures of hundreds of gigapascals through a cross-platform examination of three dynamic strength experiments. Specifically, we make use of Split–Hopkinson pressure bar and Richtmyer–Meshkov instability experiments to assess the low-pressure strain and strain rate dependence. Concurrent examination of magnetically driven ramp-release experiments up to pressures of 350GPa allows us to examine the pressure dependence. In this work, using a modern description of the shear modulus, validated against both ab initio theory and experimental measurements, we then assess how the experimentally measured pressure dependence scales with shear modulus. Furthermore, we find that the common assumption of scaling strength linearly with the shear modulus is too soft at high pressures and offer discussion as to how descriptions of slip mediated plasticity could result in an alternative scaling that is consistent with the data.
Brown, J. L., et al. "Experimental evaluation of shear modulus scaling of dynamic strength at extreme pressures." Journal of Applied Physics, vol. 128, no. 4, Jul. 2020. https://doi.org/10.1063/5.0012069
Brown, J. L., Prime, M. B., Barton, N. R., Luscher, D. J., Burakovsky, L., & Orlikowski, D. (2020). Experimental evaluation of shear modulus scaling of dynamic strength at extreme pressures. Journal of Applied Physics, 128(4). https://doi.org/10.1063/5.0012069
Brown, J. L., Prime, M. B., Barton, N. R., et al., "Experimental evaluation of shear modulus scaling of dynamic strength at extreme pressures," Journal of Applied Physics 128, no. 4 (2020), https://doi.org/10.1063/5.0012069
@article{osti_1644079,
author = {Brown, J. L. and Prime, M. B. and Barton, N. R. and Luscher, D. J. and Burakovsky, L. and Orlikowski, D.},
title = {Experimental evaluation of shear modulus scaling of dynamic strength at extreme pressures},
annote = {Recent progress in the development of dynamic strength experimental platforms is allowing for unprecedented insight into the assumptions used to construct constitutive models operating in extreme conditions. In this work, we make a quantitative assessment of how tantalum strength scales with its shear modulus to pressures of hundreds of gigapascals through a cross-platform examination of three dynamic strength experiments. Specifically, we make use of Split–Hopkinson pressure bar and Richtmyer–Meshkov instability experiments to assess the low-pressure strain and strain rate dependence. Concurrent examination of magnetically driven ramp-release experiments up to pressures of 350GPa allows us to examine the pressure dependence. In this work, using a modern description of the shear modulus, validated against both ab initio theory and experimental measurements, we then assess how the experimentally measured pressure dependence scales with shear modulus. Furthermore, we find that the common assumption of scaling strength linearly with the shear modulus is too soft at high pressures and offer discussion as to how descriptions of slip mediated plasticity could result in an alternative scaling that is consistent with the data.},
doi = {10.1063/5.0012069},
url = {https://www.osti.gov/biblio/1644079},
journal = {Journal of Applied Physics},
issn = {ISSN 0021-8979},
number = {4},
volume = {128},
place = {United States},
publisher = {American Institute of Physics (AIP)},
year = {2020},
month = {07}}
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
AC04-94AL85000; 89233218CNA000001; NA0003525
OSTI ID:
1644079
Alternate ID(s):
OSTI ID: 1642330 OSTI ID: 1775030 OSTI ID: 1671101
Report Number(s):
SAND--2020-7219J; 687372
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 128; ISSN 0021-8979
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/10.1063/1.3686538
Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, Vol. 332, Issue 1588, p. 85-111https://doi.org/10.1098/rspa.1973.0014