Effect of Defects on the HCF Behaviour of Ti-6Al-4V

KILLEN, ANDREW

doi:10.23889/SUThesis.66150

E-Thesis 71 views

Effect of Defects on the HCF Behaviour of Ti-6Al-4V / ANDREW KILLEN

Swansea University Author: ANDREW KILLEN

E-Thesis under embargo until: 12th March 2029

DOI (Published version): 10.23889/SUThesis.66150

Abstract

This research examines the high-cycle fatigue characteristics of Ti-6Al-4V, a titanium alloy with an equiaxed fine grain structure, with a particular focus on the influence of Focused Ion Beam (FIB) induced notches. The investigation reveals that the specific design and geometry of these FIB notches...

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Published:	Swansea University, Wales, UK 2024
Institution:	Swansea University
Degree level:	Doctoral
Degree name:	EngD
Supervisor:	Whittaker, M.; Davies, H.; and Friend, G.
URI:	https://cronfa.swan.ac.uk/Record/cronfa66150
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first_indexed	2024-04-24T14:10:36Z
last_indexed	2024-04-24T14:10:36Z
id	cronfa66150
recordtype	RisThesis
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spelling	v2 66150 2024-04-24 Effect of Defects on the HCF Behaviour of Ti-6Al-4V 454c1d6302f6fb79844db35d366ed418 ANDREW KILLEN ANDREW KILLEN true false 2024-04-24 This research examines the high-cycle fatigue characteristics of Ti-6Al-4V, a titanium alloy with an equiaxed fine grain structure, with a particular focus on the influence of Focused Ion Beam (FIB) induced notches. The investigation reveals that the specific design and geometry of these FIB notches, aligned to the grain size of Ti-6Al-4V, critically impacts its fatigue properties. The creation of these artificial defects through FIB significantly accelerates the onset of crack formation, with evidence suggesting a strong interaction with the material’s inherent microstructure. The depth and extent of these notches have a direct bearing on the fatigue lifespan, with deeper notches causing more pronounced reductions. Through the √Area parameter model, it was possible to effectively predict material failure with artificial micro level defects. However, it also revealed possible shortcomings in the traditional understanding of stress concentration factors, particularly when considering notch-induced behaviour. This study also highlights the possible limitations inherent to advanced Non-Destructive Testing (NDT) techniques. Despite the effectiveness of traditional NDT methods, they can sometimes miss certain micro level surface defects. This raises questions about the reliability of these methods, underlining the necessity for enhanced training and a deeper exploration into defect geometries that typically present detection challenges, especially in critical aerospace applications, including fan blades within a gas turbine engine, which have paramount safety implications. E-Thesis Swansea University, Wales, UK Materials, Aerospace 13 3 2024 2024-03-13 10.23889/SUThesis.66150 COLLEGE NANME COLLEGE CODE Swansea University Whittaker, M.; Davies, H.; and Friend, G. Doctoral EngD Rolls-Royce plc, M2A Rolls-Royce plc, M2A 2024-06-20T14:58:48.1702681 2024-04-24T14:49:50.0946061 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering ANDREW KILLEN 1 Under embargo Under embargo 2024-06-20T14:56:28.5483522 Output 40218012 application/pdf E-Thesis true 2029-03-12T00:00:00.0000000 Copyright: The Author, Andrew John Killen, 2024 true eng
title	Effect of Defects on the HCF Behaviour of Ti-6Al-4V
spellingShingle	Effect of Defects on the HCF Behaviour of Ti-6Al-4V ANDREW KILLEN
title_short	Effect of Defects on the HCF Behaviour of Ti-6Al-4V
title_full	Effect of Defects on the HCF Behaviour of Ti-6Al-4V
title_fullStr	Effect of Defects on the HCF Behaviour of Ti-6Al-4V
title_full_unstemmed	Effect of Defects on the HCF Behaviour of Ti-6Al-4V
title_sort	Effect of Defects on the HCF Behaviour of Ti-6Al-4V
author_id_str_mv	454c1d6302f6fb79844db35d366ed418
author_id_fullname_str_mv	454c1d6302f6fb79844db35d366ed418_***_ANDREW KILLEN
author	ANDREW KILLEN
author2	ANDREW KILLEN
format	E-Thesis
publishDate	2024
institution	Swansea University
doi_str_mv	10.23889/SUThesis.66150
college_str	Faculty of Science and Engineering
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hierarchy_top_title	Faculty of Science and Engineering
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department_str	School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
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description	This research examines the high-cycle fatigue characteristics of Ti-6Al-4V, a titanium alloy with an equiaxed fine grain structure, with a particular focus on the influence of Focused Ion Beam (FIB) induced notches. The investigation reveals that the specific design and geometry of these FIB notches, aligned to the grain size of Ti-6Al-4V, critically impacts its fatigue properties. The creation of these artificial defects through FIB significantly accelerates the onset of crack formation, with evidence suggesting a strong interaction with the material’s inherent microstructure. The depth and extent of these notches have a direct bearing on the fatigue lifespan, with deeper notches causing more pronounced reductions. Through the √Area parameter model, it was possible to effectively predict material failure with artificial micro level defects. However, it also revealed possible shortcomings in the traditional understanding of stress concentration factors, particularly when considering notch-induced behaviour. This study also highlights the possible limitations inherent to advanced Non-Destructive Testing (NDT) techniques. Despite the effectiveness of traditional NDT methods, they can sometimes miss certain micro level surface defects. This raises questions about the reliability of these methods, underlining the necessity for enhanced training and a deeper exploration into defect geometries that typically present detection challenges, especially in critical aerospace applications, including fan blades within a gas turbine engine, which have paramount safety implications.
published_date	2024-03-13T14:58:47Z
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score	11.014246

Effect of Defects on the HCF Behaviour of Ti-6Al-4V / ANDREW KILLEN

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