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Large elastoplastic deformation of a sample under compression and torsion in a rotational diamond anvil cell under megabar pressures

TitleLarge elastoplastic deformation of a sample under compression and torsion in a rotational diamond anvil cell under megabar pressures
Publication TypeJournal Article
Year of Publication2017
AuthorsFeng, B, Levitas, VI
JournalInternational Journal of Plasticity
Volume92
Pagination79-95
Date Published05
Type of ArticleArticle
ISBN Number0749-6419
Accession NumberWOS:000401400100006
Keywordscopper, Engineering, Finite element method, finite-element-analysis, hydrostatic-pressure, Large elastic and plastic deformations, Materials Science, mechanics, phase-transition, plastic-deformation, rhenium, Rotational diamond anvil cells, shear, Static megabar pressures, strain, stress, superconductivity
Abstract

n followed by torsion under a fixed axial force and for beveled anvils, the sample thickness reduces by a factor of ninety. Pressure, as well as the pressure gradient, grow drastically at the central part, and this new phenomenon is called the pressure self-focusing effect. This effect allows a much higher maximum pressure to be reached in a RDAC than in a DAC under the same force. The effects of diamond and sample shape, yield strength and its pressure dependence, the friction coefficient, and applied force on the pressure distribution are analyzed. The obtained results open new ways to increase maximum achievable pressure and develop new intuition in mechanical responses at megabar pressures which will be beneficial to the optimum design of geometry and loading conditions in the experiment. (C) 2017 Elsevier Ltd. All rights reserved.

DOI10.1016/j.ijplas.2017.03.002
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Short TitleInt. J. Plast.
Alternate JournalInt. J. Plast.