E-Thesis 37 views
Ceramic Matrix Composites Condition Assessment and Damage Monitoring / JORDAN STEPHEN
Swansea University Author: JORDAN STEPHEN
DOI (Published version): 10.23889/SUThesis.68057
Abstract
Ceramic matrix composites are materials that are capable of replacing current metallic alloy systems used for high temperature gas turbine engine components. They offer excellent weight saving reductions whilst maintaining adequate strength at high temperatures, due to their primary toughening mecha...
| Published: |
Swansea University, Wales, UK
2024
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| Institution: | Swansea University |
| Degree level: | Doctoral |
| Degree name: | Ph.D |
| Supervisor: | Jeffs, S. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa68057 |
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| Abstract: |
Ceramic matrix composites are materials that are capable of replacing current metallic alloy systems used for high temperature gas turbine engine components. They offer excellent weight saving reductions whilst maintaining adequate strength at high temperatures, due to their primary toughening mechanism of fibre-pullout. Their implementation within current and future engines could lead to better fuel economy and a decrease in the production of harmful emissions.In order to successfully transition into using such a material within aircraft engines, damage monitoring and condition assessment methods must be developed in order to evaluate the integrity of these materials during service intervals. Many current non-destructive evaluation methods lack the resolution necessary to identify non-critical matrix cracks that ultimately lead to premature failure of components. These methods must be developed in order to successfully implement such a material within engines.This research focuses on the identification and evaluation of non-destructive damage monitoring and condition assessment methods, that show sensitivity to detecting both mechanical and environmental damage signatures within ceramic matrix composites.The aim is to identify a method that is capable of detecting changes between acceptable and unacceptable parts quickly and efficiently, assisting sentencing of parts during overhaul.Four non-destructive evaluation methods have been assessed throughout this research project, namely, acoustic emission, vibration testing, process compensated resonance testing, and microwave cavity testing. Each of these methods displays sensitivity to detecting damage in some capacity, prompting further investigation and development that will support the safe use of ceramic matrix composites within aircraft engines. |
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| Keywords: |
Ceramic Matrix Composite, CMC, SiC/SiC, Damage Monitoring, Condition Assessment, AE, PCRT, Vibration Testing, Dielectric Spectroscopy, Mechanical Testing, Materials |
| College: |
Faculty of Science and Engineering |
| Funders: |
EPSRC, Rolls-Royce |