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Title: Spall response of single-crystal copper

Abstract

We performed a series of systematic spall experiments on single-crystal copper in an effort to determine and isolate the effects of crystal orientation, peak stress, and unloading strain rate on the tensile spall strength. Strain rates ranging from 0.62 to 2.2 × 106 s-1 and peak shock stresses in the 5–14 GPa range, with one additional experiment near 50 GPa, were explored as part of this work. Gun-driven impactors, called flyer plates, generated flat top shocks followed by spall. This work highlights the effect of crystal anisotropy on the spall strength by showing that the spall strength decreases in the following order: [100], [110], and [111]. Over the range of stresses and strain rates explored, the spall strength of [100] copper depends strongly on both the strain rate and shock stress. Except at the very highest shock stress, the results for the [100] orientation show linear relationships between the spall strength and both the applied compressive stress and the strain rate. In addition, hydrodynamic computer code simulations of the spall experiments were performed to calculate the relationship between the strain rate near the spall plane in the target and the rate of free surface velocity release during the pullback. Asmore » expected, strain rates at the spall plane are much higher than the strain rates estimated from the free surface velocity release rate. We have begun soft recovery experiments and molecular dynamics calculations to understand the unusual recompression observed in the spall signature for [100] crystals.« less

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [1];  [1]; ORCiD logo [3]; ORCiD logo [4]
  1. Nevada National Security Site, Santa Barbara, CA (United States). Special Technologies Lab.
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Nevada National Security Site, Los Alamos, NM (United States)
  4. Nevada National Security Site, Santa Barbara, CA (United States). Special Technologies Lab.; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Nevada National Security Site, Santa Barbara, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1480016
Alternate Identifier(s):
OSTI ID: 1419108
Report Number(s):
LA-UR-17-29239
Journal ID: ISSN 0021-8979
Grant/Contract Number:  
AC52-06NA25396; AC52-06NA25946
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 5; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; failure analysis; polycrystalline material; compressive stress; transition metals; plasticity; wave mechanics; molecular dynamics; deformation; crystallographic defects; crystal orientation

Citation Formats

Turley, W. D., Fensin, S. J., Hixson, R. S., Jones, D. R., La Lone, B. M., Stevens, G. D., Thomas, S. A., and Veeser, L. R. Spall response of single-crystal copper. United States: N. p., 2018. Web. doi:10.1063/1.5012267.
Turley, W. D., Fensin, S. J., Hixson, R. S., Jones, D. R., La Lone, B. M., Stevens, G. D., Thomas, S. A., & Veeser, L. R. Spall response of single-crystal copper. United States. doi:10.1063/1.5012267.
Turley, W. D., Fensin, S. J., Hixson, R. S., Jones, D. R., La Lone, B. M., Stevens, G. D., Thomas, S. A., and Veeser, L. R. Thu . "Spall response of single-crystal copper". United States. doi:10.1063/1.5012267. https://www.osti.gov/servlets/purl/1480016.
@article{osti_1480016,
title = {Spall response of single-crystal copper},
author = {Turley, W. D. and Fensin, S. J. and Hixson, R. S. and Jones, D. R. and La Lone, B. M. and Stevens, G. D. and Thomas, S. A. and Veeser, L. R.},
abstractNote = {We performed a series of systematic spall experiments on single-crystal copper in an effort to determine and isolate the effects of crystal orientation, peak stress, and unloading strain rate on the tensile spall strength. Strain rates ranging from 0.62 to 2.2 × 106 s-1 and peak shock stresses in the 5–14 GPa range, with one additional experiment near 50 GPa, were explored as part of this work. Gun-driven impactors, called flyer plates, generated flat top shocks followed by spall. This work highlights the effect of crystal anisotropy on the spall strength by showing that the spall strength decreases in the following order: [100], [110], and [111]. Over the range of stresses and strain rates explored, the spall strength of [100] copper depends strongly on both the strain rate and shock stress. Except at the very highest shock stress, the results for the [100] orientation show linear relationships between the spall strength and both the applied compressive stress and the strain rate. In addition, hydrodynamic computer code simulations of the spall experiments were performed to calculate the relationship between the strain rate near the spall plane in the target and the rate of free surface velocity release during the pullback. As expected, strain rates at the spall plane are much higher than the strain rates estimated from the free surface velocity release rate. We have begun soft recovery experiments and molecular dynamics calculations to understand the unusual recompression observed in the spall signature for [100] crystals.},
doi = {10.1063/1.5012267},
journal = {Journal of Applied Physics},
number = 5,
volume = 123,
place = {United States},
year = {2018},
month = {2}
}

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    Works referencing / citing this record:

    Effect of peak stress and tensile strain-rate on spall in tantalum
    journal, August 2018

    • Jones, D. R.; Fensin, S. J.; Martinez, D. T.
    • Journal of Applied Physics, Vol. 124, Issue 8
    • DOI: 10.1063/1.5045045

    Correlating damage progression to fragmentation at high strain rates using molecular dynamics
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    • Huddleston, B. D.; Dickel, D. E.; Williams, Neil
    • Modelling and Simulation in Materials Science and Engineering, Vol. 28, Issue 2
    • DOI: 10.1088/1361-651x/ab6364