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Title: Estimation of metal strength at very high rates using free-surface Richtmyer–Meshkov Instabilities

Abstract

Recently, Richtmyer–Meshkov Instabilities (RMI) have been proposed for studying the average strength at strain rates up to at least 107/s. RMI experiments involve shocking a metal interface that has initial sinusoidal perturbations. The perturbations invert and grow subsequent to shock and may arrest because of strength effects. In this work we present new RMI experiments and data on a copper target that had five regions with different perturbation amplitudes on the free surface opposite the shock. We estimate the high-rate, low-pressure copper strength by comparing experimental data with Lagrangian numerical simulations. From a detailed computational study we find that mesh convergence must be carefully addressed to accurately compare with experiments, and numerical viscosity has a strong influence on convergence. We also find that modeling the as-built perturbation geometry rather than the nominal makes a significant difference. Because of the confounding effect of tensile damage on total spike growth, which has previously been used as the metric for estimating strength, we instead use a new strength metric: the peak velocity during spike growth. Furthermore, this new metric also allows us to analyze a broader set of experimental results that are sensitive to strength because some larger initial perturbations grow unstably tomore » failure and so do not have a finite total spike growth.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
OSTI Identifier:
1351195
Report Number(s):
LA-UR-16-27197
Journal ID: ISSN 2199-7446
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Dynamic Behavior of Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 2; Journal ID: ISSN 2199-7446
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Richtmyer Meshkov; instability; high strain rate; strength; hydrodynamics; shock; velocimetry

Citation Formats

Prime, Michael Bruce, Buttler, William Tillman, Buechler, Miles Allen, Denissen, Nicholas Allen, Kenamond, Mark Andrew, Mariam, Fesseha Gebre, Martinez, John Israel, Oró, David Michael, Schmidt, Derek William, Stone, Joseph B., Tupa, Dale, and Vogan-McNeil, Wendy. Estimation of metal strength at very high rates using free-surface Richtmyer–Meshkov Instabilities. United States: N. p., 2017. Web. doi:10.1007/s40870-017-0103-9.
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Prime, Michael Bruce, Buttler, William Tillman, Buechler, Miles Allen, Denissen, Nicholas Allen, Kenamond, Mark Andrew, Mariam, Fesseha Gebre, Martinez, John Israel, Oró, David Michael, Schmidt, Derek William, Stone, Joseph B., Tupa, Dale, & Vogan-McNeil, Wendy. Estimation of metal strength at very high rates using free-surface Richtmyer–Meshkov Instabilities. United States. https://doi.org/10.1007/s40870-017-0103-9
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Prime, Michael Bruce, Buttler, William Tillman, Buechler, Miles Allen, Denissen, Nicholas Allen, Kenamond, Mark Andrew, Mariam, Fesseha Gebre, Martinez, John Israel, Oró, David Michael, Schmidt, Derek William, Stone, Joseph B., Tupa, Dale, and Vogan-McNeil, Wendy. Wed . "Estimation of metal strength at very high rates using free-surface Richtmyer–Meshkov Instabilities". United States. https://doi.org/10.1007/s40870-017-0103-9. https://www.osti.gov/servlets/purl/1351195.
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@article{osti_1351195,
title = {Estimation of metal strength at very high rates using free-surface Richtmyer–Meshkov Instabilities},
author = {Prime, Michael Bruce and Buttler, William Tillman and Buechler, Miles Allen and Denissen, Nicholas Allen and Kenamond, Mark Andrew and Mariam, Fesseha Gebre and Martinez, John Israel and Oró, David Michael and Schmidt, Derek William and Stone, Joseph B. and Tupa, Dale and Vogan-McNeil, Wendy},
abstractNote = {Recently, Richtmyer–Meshkov Instabilities (RMI) have been proposed for studying the average strength at strain rates up to at least 107/s. RMI experiments involve shocking a metal interface that has initial sinusoidal perturbations. The perturbations invert and grow subsequent to shock and may arrest because of strength effects. In this work we present new RMI experiments and data on a copper target that had five regions with different perturbation amplitudes on the free surface opposite the shock. We estimate the high-rate, low-pressure copper strength by comparing experimental data with Lagrangian numerical simulations. From a detailed computational study we find that mesh convergence must be carefully addressed to accurately compare with experiments, and numerical viscosity has a strong influence on convergence. We also find that modeling the as-built perturbation geometry rather than the nominal makes a significant difference. Because of the confounding effect of tensile damage on total spike growth, which has previously been used as the metric for estimating strength, we instead use a new strength metric: the peak velocity during spike growth. Furthermore, this new metric also allows us to analyze a broader set of experimental results that are sensitive to strength because some larger initial perturbations grow unstably to failure and so do not have a finite total spike growth.},
doi = {10.1007/s40870-017-0103-9},
journal = {Journal of Dynamic Behavior of Materials},
number = 2,
volume = 3,
place = {United States},
year = {Wed Mar 08 00:00:00 EST 2017},
month = {Wed Mar 08 00:00:00 EST 2017}
}
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    Works referencing / citing this record:

    Inferring Strength of Tantalum from Hydrodynamic Instability Recovery Experiments
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    • Sternberger, Z.; Maddox, B.; Opachich, Y.
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