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3D CP-XFEM modelling of short crack propagation interacting with twist/tilt nickel grain boundaries

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Title: 3D CP-XFEM modelling of short crack propagation interacting with twist/tilt nickel grain boundaries
Authors: Zhang, X
Dunne, FPE
Item Type: Journal Article
Abstract: Short fatigue crack growth across grain boundaries of differing tilt and twist combinations has been investigated in three dimensions using coupled crystal plasticity and extended finite element methods. Crack path selection and growth rate are mechanistically determined by considering crystallographic planes containing the highest shear strain and the achievement of a critical stored energy density respectively. Tilt angle is found to have weak influence on crack growth rates approaching the grain boundary but increasing twist angle was shown to lead to higher growth rate retardation, as observed in experiments. Large twist angle was also shown to lead to multi-slip system activation as the crack tip traversed the grain boundary, potentially giving rise to multiple crack planes and hence faceted cracks. Elastic stored energy density was shown to capture observed sensitivity of crack growth rates and retardations to grain boundary tilt and twist, and in combination, thereby offering an improved metric over residual Burgers vector and geometric compatibility.
Issue Date: Nov-2022
Date of Acceptance: 8-Aug-2022
URI: http://hdl.handle.net/10044/1/111954
DOI: 10.1016/j.jmps.2022.105028
ISSN: 0022-5096
Publisher: Elsevier
Journal / Book Title: Journal of the Mechanics and Physics of Solids
Volume: 168
Copyright Statement: © 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Publication Status: Published
Article Number: 105028
Online Publication Date: 2022-08-09
Appears in Collections:Materials



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