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Title: Grain orientation effects on dynamic strength of FCC multicrystals at low shock pressures: a hydrodynamic instability study

Abstract

Variability in local dynamic plasticity due to material anisotropy in polycrystalline metals is likely to be important on damage nucleation and growth at low pressures. Hydrodynamic instabilities could be used to study these plasticity effects by correlating measured changes in perturbation amplitudes at free surfaces to local plastic behavior and grain orientation, but amplitude changes are typically too small to be measured reliably at low pressures using conventional diagnostics. Correlations between strength at low shock pressures and grain orientation were studied in copper (grain size ≈ 800 µm) using the Richtmyer-Meshkov instability with a square-wave surface perturbation (wavelength=150 µm, amplitude=5 µm), shocked at 2.7 GPa using symmetric plate impacts. A Plexiglas window was pressed against the peaks of the perturbation, keeping valleys as free surfaces. This produced perturbation amplitude changes much larger than those predicted without the window. Amplitude reductions from 64% to 88% were measured in recovered samples and grains oriented close to <001> parallel to the shock had the largest final amplitude, whereas grains with shocks directions close to <101> had the lowest. Finite element simulations were performed with elastic perfectly-plastic models to estimate yield strengths leading lead to those final amplitudes. Anisotropic elasticity and these yield strengthsmore » were used to calculate the resolved shear stresses at yielding for the two orientations. Results are compared with reports on orientation dependence of dynamic yielding in Cu single crystals and the higher values obtained suggest that strength estimations via hydrodynamic instabilities are sensitive to strain hardening and strain rate effects.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1]
  1. Arizona State Univ., Tempe, AZ (United States). School for Engineering of Matter, Transport and Energy
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1348970
Alternate Identifier(s):
OSTI ID: 1460684
Report Number(s):
DOE-ASU-8683-2; DOE-ASU-02005-2
Journal ID: ISSN 0950-0839
Grant/Contract Number:  
SC0008683; NA0002005
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Philosophical Magazine Letters
Additional Journal Information:
Journal Volume: 95; Journal Issue: 2; Journal ID: ISSN 0950-0839
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; anisotropy; plasticity; shock; strength; hydrodynamic instability; Plasticity, hydrodynamic instability, shock, low pressure, strength

Citation Formats

Peralta, P., Loomis, E., Chen, Y., Brown, A., McDonald, R., Krishnan, K., and Lim, H. Grain orientation effects on dynamic strength of FCC multicrystals at low shock pressures: a hydrodynamic instability study. United States: N. p., 2015. Web. doi:10.1080/09500839.2014.994571.
Peralta, P., Loomis, E., Chen, Y., Brown, A., McDonald, R., Krishnan, K., & Lim, H. Grain orientation effects on dynamic strength of FCC multicrystals at low shock pressures: a hydrodynamic instability study. United States. https://doi.org/10.1080/09500839.2014.994571
Peralta, P., Loomis, E., Chen, Y., Brown, A., McDonald, R., Krishnan, K., and Lim, H. Thu . "Grain orientation effects on dynamic strength of FCC multicrystals at low shock pressures: a hydrodynamic instability study". United States. https://doi.org/10.1080/09500839.2014.994571. https://www.osti.gov/servlets/purl/1348970.
@article{osti_1348970,
title = {Grain orientation effects on dynamic strength of FCC multicrystals at low shock pressures: a hydrodynamic instability study},
author = {Peralta, P. and Loomis, E. and Chen, Y. and Brown, A. and McDonald, R. and Krishnan, K. and Lim, H.},
abstractNote = {Variability in local dynamic plasticity due to material anisotropy in polycrystalline metals is likely to be important on damage nucleation and growth at low pressures. Hydrodynamic instabilities could be used to study these plasticity effects by correlating measured changes in perturbation amplitudes at free surfaces to local plastic behavior and grain orientation, but amplitude changes are typically too small to be measured reliably at low pressures using conventional diagnostics. Correlations between strength at low shock pressures and grain orientation were studied in copper (grain size ≈ 800 µm) using the Richtmyer-Meshkov instability with a square-wave surface perturbation (wavelength=150 µm, amplitude=5 µm), shocked at 2.7 GPa using symmetric plate impacts. A Plexiglas window was pressed against the peaks of the perturbation, keeping valleys as free surfaces. This produced perturbation amplitude changes much larger than those predicted without the window. Amplitude reductions from 64% to 88% were measured in recovered samples and grains oriented close to <001> parallel to the shock had the largest final amplitude, whereas grains with shocks directions close to <101> had the lowest. Finite element simulations were performed with elastic perfectly-plastic models to estimate yield strengths leading lead to those final amplitudes. Anisotropic elasticity and these yield strengths were used to calculate the resolved shear stresses at yielding for the two orientations. Results are compared with reports on orientation dependence of dynamic yielding in Cu single crystals and the higher values obtained suggest that strength estimations via hydrodynamic instabilities are sensitive to strain hardening and strain rate effects.},
doi = {10.1080/09500839.2014.994571},
url = {https://www.osti.gov/biblio/1348970}, journal = {Philosophical Magazine Letters},
issn = {0950-0839},
number = 2,
volume = 95,
place = {United States},
year = {2015},
month = {4}
}

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