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Is stored energy density the primary meso-scale mechanistic driver for fatigue crack nucleation?

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Title: Is stored energy density the primary meso-scale mechanistic driver for fatigue crack nucleation?
Authors: Chen, B
Jiang, J
Dunne, FPE
Item Type: Journal Article
Abstract: Fatigue crack nucleation in a powder metallurgy produced nickel alloy containing a non-metallic inclusion has been investigated through integrated small-scale bend testing, quantitative characterisation (HR-DIC and HR-EBSD) and computational crystal plasticity which replicated the polycrystal morphology, texture and loading. Multiple crack nucleations occurred at the nickel matrix-inclusion interface and both nucleation and growth were found to be crystallographic with highest slip system activation driving crack direction. Local slip accumulation was found to be a necessary condition for crack nucleation, and that in addition, local stress and density of geometrically necessary dislocations are involved. Fatemi-Socie and dissipated energy were also assessed against the experimental data, showing generally good, but not complete agreement. However, the local stored energy density (of a Griffith-Stroh kind) identified all the crack nucleation sites as those giving the highest magnitudes of stored energy.
Issue Date: 1-Feb-2018
Date of Acceptance: 23-Nov-2017
URI: http://hdl.handle.net/10044/1/61871
DOI: 10.1016/j.ijplas.2017.11.005
ISSN: 0749-6419
Publisher: Elsevier
Start Page: 213
End Page: 229
Journal / Book Title: International Journal of Plasticity
Volume: 101
Issue: 1
Replaces: 10044/1/54370
http://hdl.handle.net/10044/1/54370
Copyright Statement: © 2017 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: Beijing Institute of Aeronautical Materials (BIAM)
Engineering & Physical Science Research Council (E
Royal Academy Of Engineering
Rolls-Royce Plc
Funder's Grant Number: N/A
138874
MMRE_P54661
1500-00268658
Keywords: Science & Technology
Technology
Engineering, Mechanical
Materials Science, Multidisciplinary
Mechanics
Engineering
Materials Science
PM nickel alloys
Crystal plasticity
Fatigue
ELECTRON BACKSCATTER DIFFRACTION
METAL-MATRIX COMPOSITES
CRYSTAL PLASTICITY
DISLOCATION DENSITY
NI SUPERALLOY
NONMETALLIC INCLUSIONS
INITIATION
DEFORMATION
FRACTURE
ALLOYS
Science & Technology
Technology
Engineering, Mechanical
Materials Science, Multidisciplinary
Mechanics
Engineering
Materials Science
PM nickel alloys
Crystal plasticity
Fatigue
BACKSCATTER DIFFRACTION ANALYSIS
CRYSTAL PLASTICITY
NI SUPERALLOY
INITIATION
INCLUSIONS
DEFORMATION
FRACTURE
GROWTH
MODEL
SENSITIVITY
Mechanical Engineering & Transports
0905 Civil Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Online Publication Date: 2017-12-02
Appears in Collections:Mechanical Engineering
Materials
Faculty of Engineering