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Title: Fifth-degree elastic energy for predictive continuum stress–strain relations and elastic instabilities under large strain and complex loading in silicon

Abstract

Materials under complex loading develop large strains and often phase transformation via an elastic instability, as observed in both simple and complex systems. Here, we represent a material (exemplified for Si I) under large Lagrangian strains within a continuum description by a 5th-order elastic energy found by minimizing error relative to density functional theory (DFT) results. The Cauchy stress—Lagrangian strain curves for arbitrary complex loadings are in excellent correspondence with DFT results, including the elastic instability driving the Si I → II phase transformation (PT) and the shear instabilities. PT conditions for Si I → II under action of cubic axial stresses are linear in Cauchy stresses in agreement with DFT predictions. Such continuum elastic energy permits study of elastic instabilities and orientational dependence leading to different PTs, slip, twinning, or fracture, providing a fundamental basis for continuum physics simulations of crystal behavior under extreme loading.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo;
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)
OSTI Identifier:
1644704
Alternate Identifier(s):
OSTI ID: 1645120
Report Number(s):
IS-J-10,239
Journal ID: ISSN 2057-3960; 115; PII: 382
Grant/Contract Number:  
AC02-07CH11358; N00014-16-1-2079
Resource Type:
Published Article
Journal Name:
npj Computational Materials
Additional Journal Information:
Journal Name: npj Computational Materials Journal Volume: 6 Journal Issue: 1; Journal ID: ISSN 2057-3960
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
36 MATERIALS SCIENCE; Atomistic models; Mechanical properties

Citation Formats

Chen, Hao, Zarkevich, Nikolai A., Levitas, Valery I., Johnson, Duane D., and Zhang, Xiancheng. Fifth-degree elastic energy for predictive continuum stress–strain relations and elastic instabilities under large strain and complex loading in silicon. United Kingdom: N. p., 2020. Web. doi:10.1038/s41524-020-00382-8.
Chen, Hao, Zarkevich, Nikolai A., Levitas, Valery I., Johnson, Duane D., & Zhang, Xiancheng. Fifth-degree elastic energy for predictive continuum stress–strain relations and elastic instabilities under large strain and complex loading in silicon. United Kingdom. https://doi.org/10.1038/s41524-020-00382-8
Chen, Hao, Zarkevich, Nikolai A., Levitas, Valery I., Johnson, Duane D., and Zhang, Xiancheng. Tue . "Fifth-degree elastic energy for predictive continuum stress–strain relations and elastic instabilities under large strain and complex loading in silicon". United Kingdom. https://doi.org/10.1038/s41524-020-00382-8.
@article{osti_1644704,
title = {Fifth-degree elastic energy for predictive continuum stress–strain relations and elastic instabilities under large strain and complex loading in silicon},
author = {Chen, Hao and Zarkevich, Nikolai A. and Levitas, Valery I. and Johnson, Duane D. and Zhang, Xiancheng},
abstractNote = {Materials under complex loading develop large strains and often phase transformation via an elastic instability, as observed in both simple and complex systems. Here, we represent a material (exemplified for Si I) under large Lagrangian strains within a continuum description by a 5th-order elastic energy found by minimizing error relative to density functional theory (DFT) results. The Cauchy stress—Lagrangian strain curves for arbitrary complex loadings are in excellent correspondence with DFT results, including the elastic instability driving the Si I → II phase transformation (PT) and the shear instabilities. PT conditions for Si I → II under action of cubic axial stresses are linear in Cauchy stresses in agreement with DFT predictions. Such continuum elastic energy permits study of elastic instabilities and orientational dependence leading to different PTs, slip, twinning, or fracture, providing a fundamental basis for continuum physics simulations of crystal behavior under extreme loading.},
doi = {10.1038/s41524-020-00382-8},
journal = {npj Computational Materials},
number = 1,
volume = 6,
place = {United Kingdom},
year = {Tue Aug 04 00:00:00 EDT 2020},
month = {Tue Aug 04 00:00:00 EDT 2020}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41524-020-00382-8

Citation Metrics:
Cited by: 12 works
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