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Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces / WILLIAM JARRETT

Swansea University Author: WILLIAM JARRETT

  • E-Thesis under embargo until: 27th August 2029

DOI (Published version): 10.23889/SUThesis.68933

Abstract

In the aerospace industry, the drive towards more efficient gas turbine engines has led to the exploration of hybrid material systems, blending the resilience of metals with the composite lightness. Organic Matrix Composites are pivotal in this regard, offering weight reductions over traditional all...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Jeffs, S.
URI: https://cronfa.swan.ac.uk/Record/cronfa68933
first_indexed 2025-02-20T11:59:25Z
last_indexed 2025-02-21T09:30:03Z
id cronfa68933
recordtype RisThesis
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Integrating these composites into engine designs, however, and particularly in regions experiencing variable hygrothermal conditions, introduces complex challenges associated with material degradation, especially at the interfaces where dissimilar materials meet. Corrosion at these interfaces, catalysed by moisture ingress and fluctuating temperatures, poses a significant threat to the structural integrity and operational efficiency of engine components. The interface between the organic composite and metal fixings is particularly vulnerable, as the differing material properties can lead to stress concentrations, accelerated wear, and eventual mechanical failure under operational loads. This degradation process is exacerbated in the cooler, humid sections of the engine where condensation is more prevalent, creating ideal conditions for corrosive processes to initiate and propagate. This thesis investigates the specific mechanisms of failure associated with these hybrid driveshafts and develops testing methods to quantify the effects of corrosion on the interface. Utilising sinusoidal and microsplined driveshaft samples provided by Rolls Royce plc, this study aims to compare the interfacial resilience across different shaft designs under similar operational conditions. Recognising the slow nature of environmental degradation under normal conditions, the study employs accelerated moisture uptake and thermal/pressure testing to simulate extended operational life within a condensed timeframe. These accelerated tests aim to mimic harsh conditions, providing vital insights into the long- term durability and reliability of the hybrid material systems. By examining distilled and saltwater uptake into the driveshaft composite, the research shows how different environmental conditions influence corrosion pathways to the interface. Furthermore, thermal testing under elevated pressures is conducted to replicate potential end-of-life scenarios, revealing significant microcracking and delamination at the composite interfaces. These findings lay a crucial foundation for enhancing the lifecycle management of composite driveshafts, with implications for designing more robust and durable hybrid material systems for future aerospace applications.</abstract><type>E-Thesis</type><journal/><volume/><journalNumber/><paginationStart/><paginationEnd/><publisher/><placeOfPublication>Swansea University, Wales, UK</placeOfPublication><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic/><keywords>Hybrid Driveshaft, Corrosion, Organic Matrix Composite, Novel Tensile Testing</keywords><publishedDay>27</publishedDay><publishedMonth>8</publishedMonth><publishedYear>2024</publishedYear><publishedDate>2024-08-27</publishedDate><doi>10.23889/SUThesis.68933</doi><url/><notes>A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information</notes><college>COLLEGE NANME</college><CollegeCode>COLLEGE CODE</CollegeCode><institution>Swansea University</institution><supervisor>Jeffs, S.</supervisor><degreelevel>Doctoral</degreelevel><degreename>Ph.D</degreename><degreesponsorsfunders>Rolls Royce plc</degreesponsorsfunders><apcterm/><funders>Rolls Royce plc</funders><projectreference/><lastEdited>2025-02-20T12:07:07.7396041</lastEdited><Created>2025-02-20T11:52:28.3237489</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>WILLIAM</firstname><surname>JARRETT</surname><order>1</order></author></authors><documents><document><filename>Under embargo</filename><originalFilename>Under embargo</originalFilename><uploaded>2025-02-20T11:58:10.9137257</uploaded><type>Output</type><contentLength>21302847</contentLength><contentType>application/pdf</contentType><version>E-Thesis</version><cronfaStatus>true</cronfaStatus><embargoDate>2029-08-27T00:00:00.0000000</embargoDate><documentNotes>Copyright: The Author, William Ian Jarrett, 2024</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2025-02-20T12:07:07.7396041 v2 68933 2025-02-20 Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces 9d820bf86e7329c26030b3a3ce317212 WILLIAM JARRETT WILLIAM JARRETT true false 2025-02-20 In the aerospace industry, the drive towards more efficient gas turbine engines has led to the exploration of hybrid material systems, blending the resilience of metals with the composite lightness. Organic Matrix Composites are pivotal in this regard, offering weight reductions over traditional all-metal components. Integrating these composites into engine designs, however, and particularly in regions experiencing variable hygrothermal conditions, introduces complex challenges associated with material degradation, especially at the interfaces where dissimilar materials meet. Corrosion at these interfaces, catalysed by moisture ingress and fluctuating temperatures, poses a significant threat to the structural integrity and operational efficiency of engine components. The interface between the organic composite and metal fixings is particularly vulnerable, as the differing material properties can lead to stress concentrations, accelerated wear, and eventual mechanical failure under operational loads. This degradation process is exacerbated in the cooler, humid sections of the engine where condensation is more prevalent, creating ideal conditions for corrosive processes to initiate and propagate. This thesis investigates the specific mechanisms of failure associated with these hybrid driveshafts and develops testing methods to quantify the effects of corrosion on the interface. Utilising sinusoidal and microsplined driveshaft samples provided by Rolls Royce plc, this study aims to compare the interfacial resilience across different shaft designs under similar operational conditions. Recognising the slow nature of environmental degradation under normal conditions, the study employs accelerated moisture uptake and thermal/pressure testing to simulate extended operational life within a condensed timeframe. These accelerated tests aim to mimic harsh conditions, providing vital insights into the long- term durability and reliability of the hybrid material systems. By examining distilled and saltwater uptake into the driveshaft composite, the research shows how different environmental conditions influence corrosion pathways to the interface. Furthermore, thermal testing under elevated pressures is conducted to replicate potential end-of-life scenarios, revealing significant microcracking and delamination at the composite interfaces. These findings lay a crucial foundation for enhancing the lifecycle management of composite driveshafts, with implications for designing more robust and durable hybrid material systems for future aerospace applications. E-Thesis Swansea University, Wales, UK Hybrid Driveshaft, Corrosion, Organic Matrix Composite, Novel Tensile Testing 27 8 2024 2024-08-27 10.23889/SUThesis.68933 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information COLLEGE NANME COLLEGE CODE Swansea University Jeffs, S. Doctoral Ph.D Rolls Royce plc Rolls Royce plc 2025-02-20T12:07:07.7396041 2025-02-20T11:52:28.3237489 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering WILLIAM JARRETT 1 Under embargo Under embargo 2025-02-20T11:58:10.9137257 Output 21302847 application/pdf E-Thesis true 2029-08-27T00:00:00.0000000 Copyright: The Author, William Ian Jarrett, 2024 true eng
title Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces
spellingShingle Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces
WILLIAM JARRETT
title_short Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces
title_full Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces
title_fullStr Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces
title_full_unstemmed Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces
title_sort Long-Term Environmental Stability of Hybrid Organic Matrix Composite Driveshafts and their Non-Corrosion Resistant Steel Interfaces
author_id_str_mv 9d820bf86e7329c26030b3a3ce317212
author_id_fullname_str_mv 9d820bf86e7329c26030b3a3ce317212_***_WILLIAM JARRETT
author WILLIAM JARRETT
author2 WILLIAM JARRETT
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publishDate 2024
institution Swansea University
doi_str_mv 10.23889/SUThesis.68933
college_str Faculty of Science and Engineering
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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
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description In the aerospace industry, the drive towards more efficient gas turbine engines has led to the exploration of hybrid material systems, blending the resilience of metals with the composite lightness. Organic Matrix Composites are pivotal in this regard, offering weight reductions over traditional all-metal components. Integrating these composites into engine designs, however, and particularly in regions experiencing variable hygrothermal conditions, introduces complex challenges associated with material degradation, especially at the interfaces where dissimilar materials meet. Corrosion at these interfaces, catalysed by moisture ingress and fluctuating temperatures, poses a significant threat to the structural integrity and operational efficiency of engine components. The interface between the organic composite and metal fixings is particularly vulnerable, as the differing material properties can lead to stress concentrations, accelerated wear, and eventual mechanical failure under operational loads. This degradation process is exacerbated in the cooler, humid sections of the engine where condensation is more prevalent, creating ideal conditions for corrosive processes to initiate and propagate. This thesis investigates the specific mechanisms of failure associated with these hybrid driveshafts and develops testing methods to quantify the effects of corrosion on the interface. Utilising sinusoidal and microsplined driveshaft samples provided by Rolls Royce plc, this study aims to compare the interfacial resilience across different shaft designs under similar operational conditions. Recognising the slow nature of environmental degradation under normal conditions, the study employs accelerated moisture uptake and thermal/pressure testing to simulate extended operational life within a condensed timeframe. These accelerated tests aim to mimic harsh conditions, providing vital insights into the long- term durability and reliability of the hybrid material systems. By examining distilled and saltwater uptake into the driveshaft composite, the research shows how different environmental conditions influence corrosion pathways to the interface. Furthermore, thermal testing under elevated pressures is conducted to replicate potential end-of-life scenarios, revealing significant microcracking and delamination at the composite interfaces. These findings lay a crucial foundation for enhancing the lifecycle management of composite driveshafts, with implications for designing more robust and durable hybrid material systems for future aerospace applications.
published_date 2024-08-27T14:06:20Z
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score 11.059359

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