No Cover Image

E-Thesis 242 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...

Full description

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
first_indexed 2024-04-24T14:10:36Z
last_indexed 2024-11-25T14:17:36Z
id cronfa66150
recordtype RisThesis
fullrecord <?xml version="1.0"?><rfc1807><datestamp>2024-06-20T14:58:48.1702681</datestamp><bib-version>v2</bib-version><id>66150</id><entry>2024-04-24</entry><title>Effect of Defects on the HCF Behaviour of Ti-6Al-4V</title><swanseaauthors><author><sid>454c1d6302f6fb79844db35d366ed418</sid><firstname>ANDREW</firstname><surname>KILLEN</surname><name>ANDREW KILLEN</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2024-04-24</date><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, 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&#x2019;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 &#x221A;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.</abstract><type>E-Thesis</type><journal/><volume/><journalNumber/><paginationStart/><paginationEnd/><publisher/><placeOfPublication>Swansea University, Wales, UK</placeOfPublication><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic/><keywords>Materials, Aerospace</keywords><publishedDay>13</publishedDay><publishedMonth>3</publishedMonth><publishedYear>2024</publishedYear><publishedDate>2024-03-13</publishedDate><doi>10.23889/SUThesis.66150</doi><url/><notes/><college>COLLEGE NANME</college><CollegeCode>COLLEGE CODE</CollegeCode><institution>Swansea University</institution><supervisor>Whittaker, M.; Davies, H.; and Friend, G.</supervisor><degreelevel>Doctoral</degreelevel><degreename>EngD</degreename><degreesponsorsfunders>Rolls-Royce plc, M2A</degreesponsorsfunders><apcterm/><funders>Rolls-Royce plc, M2A</funders><projectreference/><lastEdited>2024-06-20T14:58:48.1702681</lastEdited><Created>2024-04-24T14:49:50.0946061</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Materials Science and Engineering</level></path><authors><author><firstname>ANDREW</firstname><surname>KILLEN</surname><order>1</order></author></authors><documents><document><filename>Under embargo</filename><originalFilename>Under embargo</originalFilename><uploaded>2024-06-20T14:56:28.5483522</uploaded><type>Output</type><contentLength>40218012</contentLength><contentType>application/pdf</contentType><version>E-Thesis</version><cronfaStatus>true</cronfaStatus><embargoDate>2029-03-12T00:00:00.0000000</embargoDate><documentNotes>Copyright: The Author, Andrew John Killen, 2024</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2024-06-20T14:58:48.1702681 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
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
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
document_store_str 0
active_str 0
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 2024-03-13T14:39:06Z
_version_ 1821416721514233856
score 11.247077

Similar Items