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Microstructurally-sensitive fatigue crack growth in HCP, BCC and FCC polycrystals

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Title: Microstructurally-sensitive fatigue crack growth in HCP, BCC and FCC polycrystals
Authors: Wilson, D
Wan, W
Dunne, FPE
Item Type: Journal Article
Abstract: Microstructurally sensitive fatigue crack growth in four material systems with BCC, FCC and HCP crystallography was investigated through integrated crystal plasticity eXtended Finite Element (XFEM) modelling and experiment. The mechanistic drivers for crack path tortuosity and propagation rate have been investigated and crack propagation found to be controlled by crack tip stored energy and the crack direction by anisotropic crystallographic slip at the crack tip. Experimentally observed microstructurally-sensitive fatigue crack path tortuosities and growth rates in titanium alloy (Ti-6Al-4V), ferritic steel, nickel superalloy and zirconium alloy (zircaloy 4) have been shown to be captured, supporting the underpinning mechanistic arguments. Very short crack growth is dominated by local slip, but with increasing length, crack tip stresses begins to predominate, increasing the availability of slip systems and giving smaller amplitude oscillations between slip systems. This leads to overall crack paths which are in fact crystallographic but which appear not to be. Key features of crack retardation at grain boundaries, changes in rate resulting from crystallography, and intragranular crack path deflections have been experimentally observed and captured.
Issue Date: 1-May-2019
Date of Acceptance: 11-Feb-2019
URI: http://hdl.handle.net/10044/1/66978
DOI: 10.1016/j.jmps.2019.02.012
ISSN: 0022-5096
Publisher: Elsevier
Start Page: 204
End Page: 225
Journal / Book Title: Journal of the Mechanics and Physics of Solids
Volume: 126
Issue: 1
Copyright Statement: © 2019 Published by Elsevier Ltd. 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)
EPSRC
Royal Academy Of Engineering
Rolls-Royce Plc
Rolls-Royce Plc
Funder's Grant Number: EP/K034332/1
EP/K034332/1
MMRE_P54661
6000-00136639
1500-00268658
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Mechanics
Physics, Condensed Matter
Materials Science
Physics
Crystal plasticity
Fatigue
Short crack propagation
Microstructural sensitivity
XFEM
CRYSTAL PLASTICITY
SLIP
DEFORMATION
PROPAGATION
ANISOTROPY
DAMAGE
MODE
Mechanical Engineering & Transports
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status: Published
Online Publication Date: 2019-02-20
Appears in Collections:Materials
Faculty of Engineering