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On cold dwell facet fatigue in titanium alloy aero-engine components

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Title: On cold dwell facet fatigue in titanium alloy aero-engine components
Authors: Cuddihy, MA
Stapleton, A
Williams, SJ
Dunne, FPE
Item Type: Journal Article
Abstract: This paper investigates the mechanisms of facet nucleation through combining aero-engine manufacturer disc component test data with microstructure-sensitive crystal plasticity finite element (CPFE) models. Full-scale component testing has been carried out in a manner representative of in-service conditions. Elastic FE analyses of discs under these conditions and fully accounting for thermal and residual processing strains have also been carried out. Disc facet nucleation sites have been identified and the local stress states evaluated in order to establish crystal plasticity oligocrystal sub-models. The oligocrystal RVE models provide knowledge of hard-soft grain stresses under dwell loading, and the consequent load shedding in order to provide stresses required for the facet nucleation. The disc component facet observations together with the crystal plasticity sub-model oligocrystal approach provide persuasive evidence that a hard-soft grain combination is required for facet formation, that the remote stress state influences the resolved shear stress on the soft grain initiating slip (with tensile uniaxial stress state more damaging than a tension-tension biaxial stress state), and that the load shedding which results is essential in pushing up the hard-grain basal stress to nucleate facets.
Issue Date: Apr-2017
Date of Acceptance: 28-Nov-2016
URI: http://hdl.handle.net/10044/1/42798
DOI: 10.1016/j.ijfatigue.2016.11.034
ISSN: 0142-1123
Publisher: Elsevier
Start Page: 177
End Page: 189
Journal / Book Title: International Journal of Fatigue
Volume: 97
Copyright Statement: © 2016 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 (E
Rolls-Royce Plc
Royal Academy Of Engineering
Engineering & Physical Science Research Council (EPSRC)
EPSRC
Funder's Grant Number: EP/K503733/1
1500-00268658
MMRE_P54661
EP/K034332/1
EP/K034332/1
Keywords: Science & Technology
Technology
Engineering, Mechanical
Materials Science, Multidisciplinary
Engineering
Materials Science
Cold dwell fatigue
Crystal plasticity
Titanium alloys
Aero-engine discs
CRYSTAL PLASTICITY
STRESS TRIAXIALITY
CRACK NUCLEATION
ROOM-TEMPERATURE
ALPHA-TITANIUM
DEFORMATION
ORIENTATION
MECHANISMS
TI-6AL-4V
CREEP
Mechanical Engineering & Transports
0905 Civil Engineering
0913 Mechanical Engineering
Publication Status: Published
Online Publication Date: 2016-11-29
Appears in Collections:Materials
Faculty of Engineering