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Title: Finite-Element Simulations of Elastoplastic Flow during Compression of a Sample in a Diamond Anvil Cell under Extremely High Pressure: Effects of Geometry and Material Properties

Abstract

Finite-element simulations are conducted to investigate large elastoplastic deformations of rhenium under multimegabar pressures in a diamond anvil cell (DAC), with an emphasis on the effects of geometric and material properties. The following published experimental phenomena are reproduced: (1) the pressure distribution at the sample or diamond contact surface and the final sample thickness at pressure up to 300 GPa; (2) the cupping (i.e., appearance of a cuplike concave shape of the contact diamond-sample surface) and double cupping phenomena at megabar pressures; (3) three stages at the curve of the maximum pressure versus compressive force; (4) stages of material flow with increasing load; (5) pressure drop at the periphery after cupping in that region; and (6) change in direction of material flow to the center without change in the sign of the pressure gradient. The effects of the culet geometry, bevel angle, sample thickness, and sample or gasket system are analyzed in detail. The obtained results improve the understanding of the material mechanical response under extreme pressures and large elastoplastic deformations and are beneficial for the optimum design of a DAC with the goal of reaching the high and record high pressures once or multiple times.

Authors:
ORCiD logo [1];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Iowa State Univ., Ames, IA (United States). Dept. of Aerospace Engineering, Mechanical Engineering, and Material Science and Engineering
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1492664
Report Number(s):
LA-UR-18-23227
Journal ID: ISSN 2331-7019; PRAHB2
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Volume: 10; Journal Issue: 6; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Feng, Biao, and Levitas, Valery I. Finite-Element Simulations of Elastoplastic Flow during Compression of a Sample in a Diamond Anvil Cell under Extremely High Pressure: Effects of Geometry and Material Properties. United States: N. p., 2018. Web. doi:10.1103/PhysRevApplied.10.064060.
Feng, Biao, & Levitas, Valery I. Finite-Element Simulations of Elastoplastic Flow during Compression of a Sample in a Diamond Anvil Cell under Extremely High Pressure: Effects of Geometry and Material Properties. United States. doi:10.1103/PhysRevApplied.10.064060.
Feng, Biao, and Levitas, Valery I. Thu . "Finite-Element Simulations of Elastoplastic Flow during Compression of a Sample in a Diamond Anvil Cell under Extremely High Pressure: Effects of Geometry and Material Properties". United States. doi:10.1103/PhysRevApplied.10.064060.
@article{osti_1492664,
title = {Finite-Element Simulations of Elastoplastic Flow during Compression of a Sample in a Diamond Anvil Cell under Extremely High Pressure: Effects of Geometry and Material Properties},
author = {Feng, Biao and Levitas, Valery I.},
abstractNote = {Finite-element simulations are conducted to investigate large elastoplastic deformations of rhenium under multimegabar pressures in a diamond anvil cell (DAC), with an emphasis on the effects of geometric and material properties. The following published experimental phenomena are reproduced: (1) the pressure distribution at the sample or diamond contact surface and the final sample thickness at pressure up to 300 GPa; (2) the cupping (i.e., appearance of a cuplike concave shape of the contact diamond-sample surface) and double cupping phenomena at megabar pressures; (3) three stages at the curve of the maximum pressure versus compressive force; (4) stages of material flow with increasing load; (5) pressure drop at the periphery after cupping in that region; and (6) change in direction of material flow to the center without change in the sign of the pressure gradient. The effects of the culet geometry, bevel angle, sample thickness, and sample or gasket system are analyzed in detail. The obtained results improve the understanding of the material mechanical response under extreme pressures and large elastoplastic deformations and are beneficial for the optimum design of a DAC with the goal of reaching the high and record high pressures once or multiple times.},
doi = {10.1103/PhysRevApplied.10.064060},
journal = {Physical Review Applied},
issn = {2331-7019},
number = 6,
volume = 10,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on December 27, 2019
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