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A new hardness formula incorporating the effect of source density on indentation response: a discrete dislocation plasticity analysis

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Title: A new hardness formula incorporating the effect of source density on indentation response: a discrete dislocation plasticity analysis
Authors: Xu, Y
Balint, D
Dini, D
Item Type: Journal Article
Abstract: Planar discrete dislocation plasticity (DDP) calculations that simulate thin single crystal films bonded to a rigid substrate indented by a rigid wedge are performed for different values of film thickness and dislocation source density. As in prior studies, an indentation size effect (ISE) is observed when indentation depth is sufficiently small relative to the film thickness. The dependence of the ISE on dislocation source density is quantified in this study, and a modified form of the scaling law for the dependence of hardness on indentation depth, first derived by Nix and Gao, is proposed, which is valid over the entire range of indentation depths and correlates the length scale parameter with the average dislocation source spacing. Nanoindentation experimental data from the literature are fitted using this formula, which further verifies the proposed scaling of indentation pressure on dislocation source density.
Issue Date: 25-Sep-2019
Date of Acceptance: 14-Jun-2019
URI: http://hdl.handle.net/10044/1/70606
DOI: https://dx.doi.org/10.1016/j.surfcoat.2019.06.045
ISSN: 0257-8972
Publisher: Elsevier
Start Page: 763
End Page: 773
Journal / Book Title: Surface and Coatings Technology
Volume: 374
Copyright Statement: © 2019 Elsevier B.V. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/N025954/1
Keywords: 0306 Physical Chemistry (incl. Structural)
0912 Materials Engineering
0204 Condensed Matter Physics
Applied Physics
Publication Status: Published
Online Publication Date: 2019-06-16
Appears in Collections:Mechanical Engineering
Materials
Faculty of Natural Sciences
Faculty of Engineering