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

Feng, Biao; Levitas, Valery I.

doi:10.1103/PhysRevApplied.10.064060

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

Journal Article · Thu Dec 27 00:00:00 EST 2018 · Physical Review Applied

DOI:https://doi.org/10.1103/PhysRevApplied.10.064060· OSTI ID:1492664

^[1]; Levitas, Valery I. ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Iowa State Univ., Ames, IA (United States). Dept. of Aerospace Engineering, Mechanical Engineering, and Material Science and Engineering

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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1492664

Report Number(s):: LA-UR-18-23227

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 6 Vol. 10; ISSN 2331-7019; ISSN PRAHB2

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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