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FEM simulation of large deformation of copper in the quasi-constrain high-pressure-torsion setup

TitleFEM simulation of large deformation of copper in the quasi-constrain high-pressure-torsion setup
Publication TypeJournal Article
Year of Publication2017
AuthorsKamrani, M, Levitas, VI, Feng, B
JournalMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
Volume705
Pagination219-230
Date Published09
Type of ArticleArticle
ISBN Number0921-5093
Accession NumberWOS:000413135700029
Keywords&, compression, Contact friction, copper, diamond-anvil cell, evolution, Finite element simulation, finite-element-analysis, flow, High pressure-torsion (HPT), induced, inhomogeneity, Materials Science, Metallurgical Engineering, Microstructure, phase-transformations, Plastic deformation, Quasi-constraint setup, Severe, severe plastic-deformation, stage, Technology - Other Topics
Abstract

itions include combined Coulomb and plastic sliding. The evolution of the distribution of fields of components of the stress tensor, hydrostatic pressure, and equivalent plastic strain are studied. The effects of the critical strain for saturation of strain hardening, m, and different friction conditions are investigated. Strong heterogeneity of the plastic strain both along the radius and thickness of the sample is found, which is not well described by known approximate expressions. Torque-rotation angle response of the sample is not sensitive to the value of m but strongly depends on the friction coefficient between anvil and flash. The main conclusion is that the value of m obtained in literature from HPT (from 4.8 to 20) is highly overestimated and m = 1.57 obtained in a homogeneous compression test should be used.

DOI10.1016/j.msea.2017.08.078
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