Spall response of single-crystal copper

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.

doi:10.1063/1.5012267

Title: Spall response of single-crystal copper

Journal Article · Thu Feb 01 00:00:00 EST 2018 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5012267· OSTI ID:1480016

Turley, W. D. ^[1];

^[2]; Hixson, R. S. ^[3];

^[2]; La Lone, B. M. ^[1]; Stevens, G. D. ^[1];

^[3];

^[4]

Nevada National Security Site, Santa Barbara, CA (United States). Special Technologies Lab.
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Nevada National Security Site, Los Alamos, NM (United States)
Nevada National Security Site, Santa Barbara, CA (United States). Special Technologies Lab.; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Nevada National Security Site (NNSS), Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396; AC52-06NA25946

OSTI ID:: 1480016

Alternate ID(s):: OSTI ID: 1419108

Report Number(s):: LA-UR-17-29239

Journal Information:: Journal of Applied Physics, Vol. 123, Issue 5; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 46 works

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36 MATERIALS SCIENCE
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