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Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites / CHRISTOPHER NEWTON

Swansea University Author: CHRISTOPHER NEWTON

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DOI (Published version): 10.23889/SUthesis.59381

Abstract

The complex structural architecture and inherent processing artefacts within ceramic matrix composites combine to induce inhomogeneous deformation and damage prior to ultimate failure under mechanical loading. Bulk measurements of strain via extensometry or even localised strain gauging will fail to...

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Published: Swansea 2018
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Bache, Martin
URI: https://cronfa.swan.ac.uk/Record/cronfa59381
first_indexed 2022-02-11T16:32:56Z
last_indexed 2022-02-12T04:28:52Z
id cronfa59381
recordtype RisThesis
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spelling 2022-02-11T17:10:03.5865557 v2 59381 2022-02-11 Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites f8eb4202f184ea15f0f686e3eb0200ef CHRISTOPHER NEWTON CHRISTOPHER NEWTON true false 2022-02-11 The complex structural architecture and inherent processing artefacts within ceramic matrix composites combine to induce inhomogeneous deformation and damage prior to ultimate failure under mechanical loading. Bulk measurements of strain via extensometry or even localised strain gauging will fail to characterise such inhomogeneity when performing conventional mechanical testing on laboratory scaled coupons. By applying novel mechanical test techniques such as digital image correlation (DIC), resistance monitoring, acoustic emission (AE) and X-ray computed tomography (XCT) to the room temperature axial assessment of a SiCf/SiC composite under static and ratchetted loading, localised and bulk damage progression can be quantified. Ceramic matrix composites (CMCs) offer a combination of low density and thermal stability for structural engineering applications where long-term exposure to high temperature environments is applicable. Advanced processing techniques have been optimized to produce CMC materials based on oxide/oxide and SiCf/SiC systems, for example, which can be tailored to the manufacture of engineering components destined to operate at 800°C and above. However, the uptake of these composite materials has been slow, mainly due to the high inherent cost of both the raw materials and processing techniques together with their inherent brittle behaviour under applied tensile stress. Hence, previous focus on such systems has been largely restricted to high performance aerospace, power generation and high end automotive applications. E-Thesis Swansea 12 6 2018 2018-06-12 10.23889/SUthesis.59381 Due to Embargo and/or Third Party Copyright restrictions, this thesis is not available via this service. COLLEGE NANME COLLEGE CODE Swansea University Bache, Martin Doctoral Ph.D 2022-02-11T17:10:03.5865557 2022-02-11T16:29:10.9248015 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised CHRISTOPHER NEWTON 1
title Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites
spellingShingle Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites
CHRISTOPHER NEWTON
title_short Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites
title_full Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites
title_fullStr Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites
title_full_unstemmed Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites
title_sort Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites
author_id_str_mv f8eb4202f184ea15f0f686e3eb0200ef
author_id_fullname_str_mv f8eb4202f184ea15f0f686e3eb0200ef_***_CHRISTOPHER NEWTON
author CHRISTOPHER NEWTON
author2 CHRISTOPHER NEWTON
format E-Thesis
publishDate 2018
institution Swansea University
doi_str_mv 10.23889/SUthesis.59381
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 0
active_str 0
description The complex structural architecture and inherent processing artefacts within ceramic matrix composites combine to induce inhomogeneous deformation and damage prior to ultimate failure under mechanical loading. Bulk measurements of strain via extensometry or even localised strain gauging will fail to characterise such inhomogeneity when performing conventional mechanical testing on laboratory scaled coupons. By applying novel mechanical test techniques such as digital image correlation (DIC), resistance monitoring, acoustic emission (AE) and X-ray computed tomography (XCT) to the room temperature axial assessment of a SiCf/SiC composite under static and ratchetted loading, localised and bulk damage progression can be quantified. Ceramic matrix composites (CMCs) offer a combination of low density and thermal stability for structural engineering applications where long-term exposure to high temperature environments is applicable. Advanced processing techniques have been optimized to produce CMC materials based on oxide/oxide and SiCf/SiC systems, for example, which can be tailored to the manufacture of engineering components destined to operate at 800°C and above. However, the uptake of these composite materials has been slow, mainly due to the high inherent cost of both the raw materials and processing techniques together with their inherent brittle behaviour under applied tensile stress. Hence, previous focus on such systems has been largely restricted to high performance aerospace, power generation and high end automotive applications.
published_date 2018-06-12T08:05:02Z
_version_ 1821301332075610112
score 11.047458

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