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A microstructure-sensitive driving force for crack growth

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Title: A microstructure-sensitive driving force for crack growth
Authors: Wilson, D
Zheng, Z
Dunne, F
Item Type: Journal Article
Abstract: A stored energy based methodology for calculating the driving force for crack growth is introduced which can capture the highly local microstructural sensitivity. This has been implemented in the context of crystal plasticity finite element simulations with explicit representation of the crack with the eXtended Finite Element Method (XFEM), with non-local approaches for both stored energy and J-integral calculation. The model is shown to have good agreement with discrete dislocation plasticity (DDP) models in terms of the crack-tip dislocation configurational energy, and with experimental observations of long and very short (microstructurally-sensitive) cracks for both fracture toughness and crack growth rate data. The method is shown to capture the microstructural sensitivity, in contrast with the widely used J-Integral method. By modelling different crack lengths, the diminution of the microstructural sensitivity with increasing crack length is quantified and a critical length defined above which the microstructural sensitivity is insignificant.
Issue Date: 1-Dec-2018
Date of Acceptance: 8-Jul-2018
URI: http://hdl.handle.net/10044/1/62262
DOI: https://dx.doi.org/10.1016/j.jmps.2018.07.005
ISSN: 0022-5096
Publisher: Elsevier
Start Page: 147
End Page: 174
Journal / Book Title: Journal of the Mechanics and Physics of Solids
Volume: 121
Copyright Statement: © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license. (http://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Royal Academy Of Engineering
Rolls-Royce Plc
Rolls-Royce Plc
Funder's Grant Number: EP/K034332/1
Keywords: 01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Mechanical Engineering & Transports
Publication Status: Submitted
Online Publication Date: 2018-07-27
Appears in Collections:Materials
Faculty of Engineering