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Title: Microstructural effects on damage evolution in shocked copper polycrystals

Abstract

Three-dimensional crystal orientation fields of a copper sample, characterized before and after shock loading using High Energy Diffraction Microscopy, are used for input and validation of direct numerical simulations using a Fast Fourier Transform (FFT)-based micromechanical model. The locations of the voids determined by X-ray tomography in the incipiently-spalled sample, predominantly found near grain boundaries, were traced back and registered to the pre-shocked microstructural image. Using FFT-based simulations with direct input from the initial microstructure, micromechanical fields at the shock peak stress were obtained. Statistical distributions of micromechanical fields restricted to grain boundaries that developed voids after the shock are compared with corresponding distributions for all grain boundaries. Distributions of conventional measures of stress and strain (deviatoric and mean components) do not show correlation with the locations of voids in the post-shocked image. Neither does stress triaxiality, surface traction or grain boundary inclination angle, in a significant way. On the other hand, differences in Taylor factor and accumulated plastic work across grain boundaries do correlate with the occurrence of damage. As a result, damage was observed to take place preferentially at grain boundaries adjacent to grains having very different plastic response.

Authors:
 [1]; ORCiD logo [2];  [3];  [2];  [3]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1341861
Alternate Identifier(s):
OSTI ID: 1351013
Report Number(s):
LA-UR-16-23336
Journal ID: ISSN 1359-6454; TRN: US1701810
Grant/Contract Number:  
AC52-06NA25396; 20140114DR; NA0002918; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 116; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; polycrystal plasticity modeling; micromechanics; damage initiation; deformation inhomogeneities; shocks

Citation Formats

Lieberman, Evan J., Lebensohn, Ricardo A., Menasche, David B., Bronkhorst, Curt Allan, and Rollett, Anthony D.. Microstructural effects on damage evolution in shocked copper polycrystals. United States: N. p., 2016. Web. https://doi.org/10.1016/j.actamat.2016.06.054.
Lieberman, Evan J., Lebensohn, Ricardo A., Menasche, David B., Bronkhorst, Curt Allan, & Rollett, Anthony D.. Microstructural effects on damage evolution in shocked copper polycrystals. United States. https://doi.org/10.1016/j.actamat.2016.06.054
Lieberman, Evan J., Lebensohn, Ricardo A., Menasche, David B., Bronkhorst, Curt Allan, and Rollett, Anthony D.. Fri . "Microstructural effects on damage evolution in shocked copper polycrystals". United States. https://doi.org/10.1016/j.actamat.2016.06.054. https://www.osti.gov/servlets/purl/1341861.
@article{osti_1341861,
title = {Microstructural effects on damage evolution in shocked copper polycrystals},
author = {Lieberman, Evan J. and Lebensohn, Ricardo A. and Menasche, David B. and Bronkhorst, Curt Allan and Rollett, Anthony D.},
abstractNote = {Three-dimensional crystal orientation fields of a copper sample, characterized before and after shock loading using High Energy Diffraction Microscopy, are used for input and validation of direct numerical simulations using a Fast Fourier Transform (FFT)-based micromechanical model. The locations of the voids determined by X-ray tomography in the incipiently-spalled sample, predominantly found near grain boundaries, were traced back and registered to the pre-shocked microstructural image. Using FFT-based simulations with direct input from the initial microstructure, micromechanical fields at the shock peak stress were obtained. Statistical distributions of micromechanical fields restricted to grain boundaries that developed voids after the shock are compared with corresponding distributions for all grain boundaries. Distributions of conventional measures of stress and strain (deviatoric and mean components) do not show correlation with the locations of voids in the post-shocked image. Neither does stress triaxiality, surface traction or grain boundary inclination angle, in a significant way. On the other hand, differences in Taylor factor and accumulated plastic work across grain boundaries do correlate with the occurrence of damage. As a result, damage was observed to take place preferentially at grain boundaries adjacent to grains having very different plastic response.},
doi = {10.1016/j.actamat.2016.06.054},
journal = {Acta Materialia},
number = C,
volume = 116,
place = {United States},
year = {2016},
month = {7}
}

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Cited by: 6 works
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    Works referencing / citing this record: