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Wear fatigue in nickel superalloys. / Shaun Gareth Watkins

Swansea University Author: Shaun Gareth Watkins

Abstract

To date, work to assess the progression of wear and the effects of wear damage on low cycle fatigue has tended to be focused on specific components and their operating conditions. Although effective in the short term to solve today’s problems, these efforts often deliver insufficient understanding o...

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Published: 2015
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
URI: https://cronfa.swan.ac.uk/Record/cronfa43108
first_indexed 2018-08-02T18:56:18Z
last_indexed 2019-10-21T16:49:02Z
id cronfa43108
recordtype RisThesis
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spelling 2018-09-03T09:59:05.8053518 v2 43108 2018-08-02 Wear fatigue in nickel superalloys. 4d49f7a70ca7648dac2d414c1436f1ec NULL Shaun Gareth Watkins Shaun Gareth Watkins true true 2018-08-02 To date, work to assess the progression of wear and the effects of wear damage on low cycle fatigue has tended to be focused on specific components and their operating conditions. Although effective in the short term to solve today’s problems, these efforts often deliver insufficient understanding of the overall design space limits to have much influence of future component design.Therefore, the following research attempts to understand how wear damage progresses and how it impacts on fatigue performance in order to develop more accurate lifing models to predict the behaviour and life of real engine components.In order to do this, a survey of the internal Rolls-Royce database and public literature on wear damage on components from ex-service and current service engines was performed. Information relating to the wear scar morphologies in the reports was extracted as well as physically measuring and analysing wear damage on worn components within the Rolls- Royce failure investigation department. The wear damage was then replicated onto Udimet720Li laboratory fatigue specimens by a means of altering the pad pressure and pad sliding distance to produce a range of wear damage in order to carry out fatigue testing. Fatigue testing of the damaged specimens allowed fatigue knockdown factors to be calculated to determine the impact of wear on the fatigue life.A fretting fatigue rig was also designed and built for this research to focus on in-situ fretting fatigue at high temperatures of 600°C. E-Thesis Metallurgy 31 12 2015 2015-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral EngD 2018-09-03T09:59:05.8053518 2018-08-02T16:24:31.3034091 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Shaun Gareth Watkins NULL 1 0043108-02082018162547.pdf 10821500.pdf 2018-08-02T16:25:47.2470000 Output 22557029 application/pdf E-Thesis true 2018-08-02T16:25:47.2470000 false
title Wear fatigue in nickel superalloys.
spellingShingle Wear fatigue in nickel superalloys.
Shaun Gareth Watkins
title_short Wear fatigue in nickel superalloys.
title_full Wear fatigue in nickel superalloys.
title_fullStr Wear fatigue in nickel superalloys.
title_full_unstemmed Wear fatigue in nickel superalloys.
title_sort Wear fatigue in nickel superalloys.
author_id_str_mv 4d49f7a70ca7648dac2d414c1436f1ec
author_id_fullname_str_mv 4d49f7a70ca7648dac2d414c1436f1ec_***_Shaun Gareth Watkins
author Shaun Gareth Watkins
author2 Shaun Gareth Watkins
format E-Thesis
publishDate 2015
institution Swansea University
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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
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description To date, work to assess the progression of wear and the effects of wear damage on low cycle fatigue has tended to be focused on specific components and their operating conditions. Although effective in the short term to solve today’s problems, these efforts often deliver insufficient understanding of the overall design space limits to have much influence of future component design.Therefore, the following research attempts to understand how wear damage progresses and how it impacts on fatigue performance in order to develop more accurate lifing models to predict the behaviour and life of real engine components.In order to do this, a survey of the internal Rolls-Royce database and public literature on wear damage on components from ex-service and current service engines was performed. Information relating to the wear scar morphologies in the reports was extracted as well as physically measuring and analysing wear damage on worn components within the Rolls- Royce failure investigation department. The wear damage was then replicated onto Udimet720Li laboratory fatigue specimens by a means of altering the pad pressure and pad sliding distance to produce a range of wear damage in order to carry out fatigue testing. Fatigue testing of the damaged specimens allowed fatigue knockdown factors to be calculated to determine the impact of wear on the fatigue life.A fretting fatigue rig was also designed and built for this research to focus on in-situ fretting fatigue at high temperatures of 600°C.
published_date 2015-12-31T13:33:58Z
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score 11.04776

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